CHEMISTRY FORM ONE NOTES
INTRODUCTION TO CHEMISTRY
Chemistry is a branch of Science. Science is basically the study of living and non-living things. The branch of science that study living things is called Biology. The branch of science that study non-living things is called Physical Science. Physical Science is made up of:
- Physics- the study of matter in relation to energy
- Chemistry- the study of the composition of matter.
Chemistry is thus defined as the branch of science that deals with the structure composition, properties and behavior of matter.
Basic Chemistry involves studying:
- States/phases of matter
Matter is anything that has weight/mass and occupies space/volume. Naturally, there are basically three states of matter.
(i) Solid-e.g. soil, sand, copper metal, bucket, ice.
(ii)Liquid- e.g. water, Petrol, ethanol/alcohol, Mercury (liquid metal).
(iii) gas- e.g. Oxygen, Nitrogen ,Water vapour.
A solid is made up of particles which are very closely packed. It thus has a definite/fixed shape and fixed/definite volume /occupies definite space. It has a very high density.
A liquid is made up of particles which have some degree of freedom. It thus has no definite/fixed shape. It takes the shape of the container it is put. A liquid has fixed/definite volume/occupies definite space.
A gas is made up of particles free from each other. It thus has no definite/fixed shape. It takes the shape of the container it is put. It has no fixed/definite volume/occupies every space in a container.
Didn’t find what you were looking for? Worry not. Search for more notes and other learning/teaching materials, below. Simply type in the box below and click on the search button.
Hot Downloads!!
Chemistry Topic By Topic Questions And answers (All Topics)
CHEMISTRY FORM FOUR NOTES: NEW
Free Chemistry notes, revision questions, KCSE past Papers, Exams, Marking Schemes,…
Chemistry High School notes for form 1-4 (Free updated pdf downloads)
CHEMISTRY NOTES F1-4: LATEST NOTES
Free updated schemes of work for all subjects (Secondary; Form 1-4)
Schemes of work for all subjects, free updated downloads- Secondary schools
KCSE Topical Revision Resources For All Subjects (Topic By Topic Questions…
Continue reading:
ELECTROCHEMISTRY FORM 4 CHEMISTRY NOTES
Chemistry free lesson plans for all topics (Form one to four)
Chemistry Topic By Topic Questions And answers (All Topics)
Chemistry High School notes for form 1-4 (Free updated pdf downloads)
CHEMISTRY NOTES F1-4: LATEST NOTES
(b) Separation of mixture
A mixture is a combination of two or more substances that can be separated by physical means. Simple methods of separating mixtures at basic chemistry level include:
- i) Sorting/picking-this involve physically picking one pure substance from a mixture with another/other. e. g. sorting maize from maize beans mixture.
- ii) Decantation-this involve pouring out a liquid from a solid that has settled /sinking solid in it. e. g. Decanting water forms sand.
iii)Filtration-this involves sieving /passing particles of a mixture through a filter containing small holes that allow smaller particle to pass through but do not allow bigger particle to pass through.
- iv) Skimming-this involve scooping floating particles. E.g. cream from milk
(c) Metals and non-metals
Metals are shiny, ductile(able to form wires), malleable(able to form sheet) and coil without breaking. E.g. Iron, gold, silver, copper. Mercury is the only liquid metal known.
Non-metals are dull, not ductile (do not form wires), not malleable (do not form sheet) and break on coiling/brittle. E.g. Charcoal, Sulphur, pla-stics.
(d) Conductors and non-conductors
A conductor is a solid that allow electric current to pass through. A non-conductor is a solid that do not allow electric current to pass through.
All metals conduct electricity. All non-metals do not conduct electricity except carbon graphite.
(e) Drugs
A drug is a natural or synthetic/man-made substance that when taken changes/alter the body functioning. A natural or synthetic/man-made substance that when taken changes/alter the abnormal body functioning to normal is called medicine. Medicines are thus drugs intended to correct abnormal body functions. . Medicines should therefore be taken on prescription and dosage.
A prescription is a medical instruction to a patient/sick on the correct type of medicine to take and period/time between one intake to the other.
A dosage is the correct quantity of drug required to alter the abnormal body function back to normal. This is called treatment. It is the professional work of qualified doctors/pharmacists to administer correct prescription and dosage of drugs/medicine to the sick. Prescription and dosage of drugs/medicine to the sick use medical language.
Example
(i) 2 x 4 ; means “2” tablets for solid drugs/spoonfuls for liquid drugs taken “4” times for a duration of one day/24 hours and then repeated and continued until all the drug given is finished.
(ii) 1 x 2 ; means “1” tablets for solid drugs/spoonfuls for liquid drugs taken “2” times for a duration of one day/24 hours and then repeated and continued until all the drug given is finished.
Some drugs need minimal prescription and thus are available without pharmacist/ doctor’s prescription. They are called Over The Counter (OTC) drugs. OTC drugs used to treat mild headaches, stomach upsets, common cold include:
(i) Painkillers
(ii) Anti-acids
(iii) cold/flu drugs.
All medicine requires correct intake dosage. When a prescription dosage is not followed, this is called drug misuse/abuse. Some drugs are used for other purposes other than that intended. This is called drug abuse.
Drug abuse is when a drug is intentionally used to alter the normal functioning of the body. The intentional abnormal function of the drug is to make the victim have false feeling of well being. The victim lack both mental and physical coordination.
Some drugs that induce a false feeling of well being are illegal. They include heroin, cocaine, bhang, Mandrax and morphine.
Some abused drugs which are not illegal include: Miraa, alcohol, tobacco, sleeping pills.
RELATED CONTENTS
FREE FORM 1 NOTES DOWNLOADS FOR SECONDARY SCHOOLS: ALL SUBJECTS FREE EDITABLE NOTES
RELATED CONTENT
- Form 2 notes for all subjects free download
- Form one notes for all subjects free download
- FORM FOUR FULL EXAM PAPERS & ANSWERS FOR ALL SUBJECTS: OVER 1,000 KCSE REVISION PAPERS
- FORM 4 EXAMINATIONS AND MARKING SCHEMES: ALL SUBJECTS FOR KCSE CANDIDATES- OVER 1,000 PAPERS
- MATHEMATICS NOTES: TOPICAL MATHS ASSIGNMENTS F1-4 WITH ANSWERS
- KISWAHILI NOTES- REVISION KIT
- KISWAHILI USHAIRI NOTES WITH EXAMPLES AND GUIDES
- HISTORY NOTES FORM 4: NEW SYLLABUS SIMPLIFIED NOTES
- HISTORY NOTES FORM 3: NEW SYLLABUS SIMPLIFIED NOTES
The role of chemistry in society
(a) Chemistry is used in the following:
(i) Washing/cleaning with soap:
Washing/cleaning is a chemical process that involves interaction of water, soap and dirt so as to remove the dirt from a garment.
(ii) Understanding chemicals of life
Living thing grow, respire and feed. The formation and growth of cells involve chemical processes in living things using carbohydrates, proteins and vitamins.
(iii) Baking:
Adding baking powder to dough and then heating in an oven involves interactions that require understanding of chemistry.
(iv) Medicine:
Discovery, test, prescription and dosage of drugs to be used for medicinal purposes require advanced understanding of chemistry
(v) Fractional distillation of crude oil:
Crude oil is fractional distilled to useful portions like petrol, diesel, kerosene by applying chemistry.
(vi) Manufacture of synthetic compounds/substances
Large amounts of plastics, glass, fertilizers, insecticides, soaps, cements, are manufactured worldwide. Advanced understanding of the chemical processes involved is a requirement.
(vii) Diagnosis/test for abnormal body functions.
If the body is not functioning normally, it is said to be sick/ill. Laboratory test are done to diagnose the illness/sickness.
(b) The following career fields require Chemistry as one of subject areas of advanced/specialized study:
(i) Chemical engineering/chemical engineer
(ii) Veterinary medicine/Veterinary doctor
(iii) Medicine/Medical doctor/pharmacist/nurse
(iv) Beauty/Beautician
(v) Teaching/Chemistry teacher.
DO NOT MISS OUT ON ANY ACADEMIC MATERIAL FOR BOTH PRIMARY AND SECONDARY SCHOOLS’ SYLLABUSES. JUST CLICK THE LINK BELOW AND SEARCH FOR YOUR DESIRED ACADEMIC CONTENT;
The School Chemistry Laboratory
Chemistry is studied mainly in a science room called a school chemistry laboratory. The room is better ventilated than normal classroom. It has electricity, gas and water taps. A school chemistry laboratory has a qualified professional whose called Laboratory technician/assistant.
All students user in a school chemistry laboratory must consult the Laboratory technician/assistant for all their laboratory work. A school chemistry laboratory has chemicals and apparatus.
A chemical is a substance whose composition is known. All chemical are thus labeled as they are. This is because whereas physically a substance may appear similar, chemically they may be different.
All Chemicals which are not labeled should never be used. Some chemicals are toxic/poisonous, explosive, corrosive, caustic, irritants, flammable, oxidizing, carcinogenic, or radioactive.
Care should always be taken when handling any chemical which have any of the above characteristic properties.
Common school chemistry laboratory chemicals include:
(i) Distilled water
(ii) Concentrated mineral acid which are very corrosive (on contact with skin they cause painful open wounds)
(iii) Concentrated alkali/bases which are caustic (on contact with skin they cause painful blisters)
(iv) Very many types of salts
The following safety guideline rules should be followed by chemistry laboratory users:
(i) Enter the laboratory with permission in an orderly manner without rushing/pushing/scrabbling.
(ii) Do not try unauthorized experiments. They may produce flammable, explosive or toxic substances that affect your health.
(iii) Do not taste any chemical in the laboratory. They may be poisonous.
(iv) Waft gas fumes to your nose with your palm. Do not inhale/smell gases directly. They may be highly poisonous/toxic.
(v) Boil substances with mouth of the test tube facing away from others and yourself. Boiling liquids spurt out portions of the hot liquid. Products of heating solids may be a highly poisonous/toxic gas.
(vi) Wash with lots of water any skin contact with chemicals immediately. Report immediately to teacher/laboratory technician any irritation, cut, burn, bruise or feelings arising from laboratory work.
(vii) Read and follow safety instruction. All experiments that evolve/produce poisonous gases should be done in the open or in a fume chamber.
(viii )Clean your laboratory work station after use. Wash your hand before leaving the chemistry laboratory.
(ix) In case of fire, remain calm, switch of the source of fuel-gas tap. Leave the laboratory through the emergency door. Use fire extinguishers near the chemistry laboratory to put of medium fires. Leave strong fires wholly to professional fire fighters.
(x) Do not carry unauthorized item from a chemistry laboratory.
An apparator /apparatus are scientific tools/equipment used in performing scientific experiments. The conventional apparator used in performing scientific experiments is called standard apparator/apparatus. If the conventional standard apparator/apparatus is not available, an improvised apparator/apparatus may be used in performing scientific experiments. An improvised apparator/apparatus is one used in performing a scientific experiment for a standard apparator/apparatus. Most standard apparatus in a school chemistry laboratory are made of glass because:
(i)Glass is transparent and thus reactions /interactions inside are clearly visible from outside
(ii) Glass is comparatively cheaper which reduces cost of equipping the school chemistry laboratory
(iii) Glass is comparatively easy to clean/wash after use.
(iv) Glass is comparatively unreactive to many chemicals.
Apparatus are designed for the purpose they are intended in a school chemistry laboratory:
- Apparatus for measuring volume
- Measuring cylinder
Measuring cylinders are apparatus used to measure volume of liquid/ solutions. They are calibrated/ graduated to measure any volume required to the maximum. Measuring cylinders are named according to the maximum calibrated/graduated volume e.g.
“10ml” measuring cylinder is can hold maximum calibrated/graduated volume of “10mililitres” /“10 cubic centimetres”
“50ml” measuring cylinder is can hold maximum calibrated/graduated volume of “50mililitres” /“50 cubic centimetres”
“250ml” measuring cylinder is can hold maximum calibrated/graduated volume of “250mililitres” /“250 cubic centimetres”
“1000ml” measuring cylinder is can hold maximum calibrated/graduated volume of “1000mililitres” /“1000 cubic centimetres”
- Burette
Burette is a long and narrow/thin apparatus used to measure small accurate and exact volumes of a liquid solution. It must be clamped first on a stand before being used. It has a tap to run out the required amount out. They are calibrated/ graduated to run out small volume required to the maximum 50ml/50cm3.
The maximum 50ml/50cm3 calibration/ graduation reading is at the bottom .This ensure the amount run out from a tap below can be determined directly from burette reading before and after during volumetric analysis.
Burettes are expensive and care should be taken when using them.
- (i) Pipette
Pipette is a long and narrow/thin apparatus that widens at the middle used to measure and transfer small very accurate/exact volumes of a liquid solution.
It is open on either ends.
The maximum 25ml/25cm3 calibration/ graduation mark is a visible ring on one thin end.
To fill a pipette to this mark, the user must suck up a liquid solution upto a level above the mark then adjust to the mark using a finger.
This requires practice.
(ii) Pipette filler
Pipette filler is used to suck in a liquid solution into a pipette instead of using the mouth. It has a suck, adjust and eject button for ensuring the exact volume is attained. This requires practice.
- Volumetric flask.
A volumetric flask is thin /narrow but widens at the base/bottom. It is used to measure very accurate/exact volumes of a liquid solution.
The maximum calibration / graduation mark is a visible ring.
Volumetric flasks are named according to the maximum calibrated/graduated volume e.g.
“250ml” volumetric flask has a calibrated/graduated mark at exact volume of “250mililitres” /“250centimetres”
“1l” volumetric flask has a calibrated/graduated mark at exact volume of “one litre” /“1000 cubic centimeters”
“2l” volumetric flask has a calibrated/graduated mark at exact volume of “two litres” /“2000 cubic centimeters”
- Dropper/teat pipette
A dropper/teat pipette is a long thin/narrow glass/rubber apparatus that has a flexible rubber head.
A dropper/teat pipette is used to measure very small amount/ drops of liquid solution by pressing the flexible rubber head. The numbers of drops needed are counted by pressing the rubber gently at a time
(b)Apparatus for measuring mass
- Beam balance
A beam balance has a pan where a substance of unknown mass is placed. The scales on the opposite end are adjusted to “balance” with the mass of the unknown substance. The mass from a beam balance is in grams.
- Electronic/electric balance.
An electronic/electric balance has a pan where a substance of unknown mass is placed. The mass of the unknown substance in grams is available immediately on the screen.
(c)Apparatus for measuring temperature
A thermometer has alcohol or mercury trapped in a bulb with a thin enclosed outlet for the alcohol/mercury in the bulb.
If temperature rises in the bulb, the alcohol /mercury expand along the thin narrow enclosed outlet.
The higher the temperature, the more the expansion
Outside, a calibration /graduation correspond to this expansion and thus changes in temperature.
A thermometer therefore determines the temperature when the bulb is fully dipped in to the substance being tested. To determine the temperature of solid is thus very difficult.
(d)Apparatus for measuring time
The stop watch/clock is the standard apparatus for measuring time. Time is measured using hours, minutes and second.
Common school stop watch/clock has start, stop and reset button for determining time for a chemical reaction. This requires practice.
(e) Apparatus for scooping
- Spatula
A spatula is used to scoop solids which do not require accurate measurement. Both ends of the spatula can be used at a time.
A solid scooped to the brim is “one spatula end full” A solid scooped to half brim is “half spatula end full”.
- Deflagrating spoon
A deflagrating spoon is used to scoop solids which do not require accurate measurement mainly for heating. Unlike a spatula, a deflagrating spoon is longer.
(f) Apparatus for putting liquids/solid for heating.
- Test tube.
A test tube is a narrow/thin glass apparatus open on one side. The end of the opening is commonly called the “the mouth of the test tube”.
- Boiling/ignition tube.
A boiling/ignition tube is a wide glass apparatus than a test tube open on one side. The end of the opening is commonly called the “the mouth of the boiling/ignition tube”.
- Beaker.
Beaker is a wide calibrated/graduated lipped glass/plastic apparatus used for transferring liquid solution which do not normally require very accurate measurements
Beakers are named according to the maximum calibrated/graduated volume they can hold e.g.
“250ml” beaker has a maximum calibrated/graduated volume of “250mililitres” /“250 cubic centimeters”
“1l” beaker has a maximum calibrated/graduated volume of “one litre” /“1000 cubic centimeters”
“5 l” beaker has a maximum calibrated/graduated volume of “two litres” /“2000 cubic centimeters”
- Conical flask.
A conical flask is a moderately narrow glass apparatus with a wide base and no calibration/graduation. Conical flasks thus carry/hold exact volumes of liquids that have been measured using other apparatus. It can also be put some solids. The narrow mouth ensures no spillage.
Conical flasks are named according to the maximum volume they can hold e.g. “250ml” Conical flasks hold a maximum volume of “250mililitres” /“250 cubic centimeters”
“500ml” Conical flasks hold a maximum volume of “500ml” /“1000 cubic centimeters”
- Round bottomed flask
A round bottomed flask is a moderately narrow glass apparatus with a wide round base and no calibration/graduation. Round bottomed flask thus carry/hold exact volumes of liquids that have been measured using other apparatus. The narrow/thin mouth prevents spillage. The flask can also hold (weighed) solids. A round bottomed flask must be held/ clamped when in use because of its wide narrow base.
- Flat bottomed flask
A flat bottomed flask is a moderately narrow glass apparatus with a wide round base with a small flat bottom. It has no calibration/graduation.
Flat bottomed flasks thus carry/hold exact volumes of liquids that have been measured using other apparatus. The narrow/thin mouth prevents spirage. They can also hold (weighed) solids. A flat bottomed flask must be held/ clamped when in use because it’s flat narrow base is not stable.
(g) Apparatus for holding unstable apparatus (during heating).
- Tripod stand
A tripod stand is a three legged metallic apparatus which unstable apparatus are placed on (during heating).Beakers. Conical flasks, round bottomed flask and flat bottomed flasks are placed on top of tripod stand (during heating).
- Wire gauze/mesh
Wire gauze/mesh is a metallic/iron plate of wires crossings. It is placed on top of a tripod stand:
(i) Ensure even distribution of heat to prevent cracking glass apparatus
(ii) Hold smaller apparatus that cannot reach the edges of tripod stand
3 Clamp stand
A clamp stand is a metallic apparatus which tightly hold apparatus at their “neck” firmly.
A clamp stand has a wide metallic base that ensures maximum stability. The height and position of clamping is variable. This require practice
- Test tube holder
A test tube holder is a hand held metallic apparatus which tightly hold test/boiling/ignition tube at their “neck” firmly on the other end.
Some test tube holders have wooden handle that prevent heat conduction to the hand during heating.
- Pair of tong.
A pair of tong is a scissor-like hand held metallic apparatus which tightly hold firmly a small solid sample on the other end.
- Gas jar
A gas jar is a long wide glass apparatus with a wide base.
It is open on one end. It is used to collect/put gases.
This requires practice.
(h) Apparatus for holding/directing liquid solutions/funnels (to avoid spillage).
- Filter funnel
A filter funnel is a wide mouthed (mainly plastic) apparatus that narrow drastically at the bottom to a long extension.
When the long extension is placed on top of another apparatus, a liquid solution can safely be directed through the wide mouth of the filter funnel into the apparatus without spirage.
Filter funnel is also used to place a filter paper during filtration.
- Thistle funnel
A thistle funnel is a wide mouthed glass apparatus that narrow drastically at the bottom to a very long extension.
The long extension is usually drilled through a stopper/cork.
A liquid solution can thus be directed into a stoppered container without spillage
- Dropping funnel
A dropping funnel is a wide mouthed glass apparatus with a tap that narrow drastically at the bottom to a very long extension.
The long extension is usually drilled through a stopper/cork.
A liquid solution can thus be directed into a stoppered container without spillage at the rate determined by adjusting the tap.
- Separating funnel
A separating funnel is a wide mouthed glass apparatus with a tap at the bottom narrow extension.
A liquid solution can thus be directed into a separating funnel without spillage. It can also safely be removed from the funnel by opening the tap.
It is used to separate two or more liquid solution mixtures that form layers/immiscible. This requires practice.
(h) Apparatus for heating/Burners
- Candle, spirit burner, kerosene stove, charcoal burner/jiko are some apparatus that can be used for heating.
Any flammable fuel when put in a container and ignited can produce some heat.
- Bunsen burner
The Bunsen burner is the standard apparatus for heating in a Chemistry school laboratory.
It was discovered by the German Scientist Robert Wilhelm Bunsen in1854.
(a)Diagram of a Bunsen burner
A Bunsen burner uses butane/laboratory gas as the fuel. The butane/laboratory gas is highly flammable and thus usually stored safely in a secure chamber outside Chemistry school laboratory. It is tapped and distributed into the laboratory through gas pipes.
The gas pipes end at the gas tap on a chemistry laboratory bench .If opened the gas tap releases butane/laboratory gas. Butane/laboratory gas has a characteristic odor/smell that alerts leakages/open gas tap.
The Bunsen burner is fixed to the gas tap using a strong rubber tube.
The Bunsen burner is made up of the following parts:
(i) Base plate –to ensure the burner can stand on its own
(ii)Jet-a hole through which laboratory gas enters the burner
(iii)Collar/sleeve-adjustable circular metal attached to the main chimney/burell with a side hole/entry. It controls the amount of air entering used during burning.
(iv)Air hole- a hole/entry formed when the collar side hole is in line with chimney side hole. If the collar side hole is not in line with chimney side hole, the air hole is said to be “closed” If the collar side hole is in line with chimney side hole, the air hole is said to be “open”
(v)Chimney- tall round metallic rod attached to the base plate.
(b)Procedure for lighting/igniting a Bunsen burner
- Adjust the collar to ensure the air holes are closed.
- Connect the burner to the gas tap using a rubber tubing. Ensure the rubber tubing has no side leaks.
- Turn on the gas tap.
- Ignite the top of the chimney using a lighted match stick/gas lighter/wooden splint.
- Do not delay excessively procedure (iv) from (iii) to prevent highly flammable laboratory gas from escaping/leaking.
(c)Bunsen burner flames
A Bunsen burner produces two types of flames depending on the amount of air entering through the air holes.
If the air holes are fully open, a non luminous flame is produced. If the air holes are fully closed, a luminous flame is produced. If the air holes are partially open/ closed, a hybrid of non luminous and luminous flames is produced.
Characteristic differences between luminous and non-luminous flame
| Luminous flame | Non-luminous flame
|
| 1. Produced when the air holes are fully/completely closed. | 1. Produced when the air holes are fully/completely open.
|
| 2. when the air holes are fully/ completely closed there is incomplete burning/ combustion of the laboratory gas | 2.when the air holes are fully/ completely open there is complete burning/ combustion of the laboratory gas
|
| 3. Incomplete burning/ combustion of the laboratory gas produces fine unburnt carbon particles which make the flame sooty/smoky | 3. Complete burning/ combustion of the laboratory gas does not produce carbon particles. This makes the flame non-sooty /non- smoky. |
| 4. Some carbon particles become white hot and emit light. This flame is thus bright yellow in colour producing light. This makes luminous flame useful for lighting | 4. Is mainly blue in colour and is hotter than luminous flame. This makes non-luminous flame useful for heating
|
| 5. Is larger, quiet and wavy/easily swayed by wind | 5.Is smaller, noisy and steady
|
| Luminous flame has three main regions: (i)the top yellow region where there is incomplete combustion/burning (ii)the region of unburnt gas below the yellow region where the gas does not burn (iii) blue region on the sides of region of unburnt gas where there is complete burning | Non-luminous flame has four main regions: (i)the top colourless region (ii) Blue region just below where there is complete burning. It is the hottest region (iii) green region surrounded by the blue region where there is complete burning (Ii) The region of unburnt gas at the innermost surrounded by green and blue regions. No burning takes place here
|
Scientific apparatus are drawn:
(i) Using a proportional two dimension (2D) cross-sections. Three dimensions (3D) are not recommended.
(ii) Straight edges of the apparatus on a scientific diagram should be drawn using ruler.
(iii) Curved edges of the apparatus on a scientific diagram should be drawn using free hand.
(iv)The bench, tripod or clamp to support apparatus which cannot stand on their own should be shown.
CLASSIFICATION OF SUBSTANCES
Substances are either pure or impure. A pure substance is one which contains only one substance.
An impure substance is one which contains two or more substances. A pure substance is made up of a pure solid, pure liquid or pure gas.
A mixture is a combination of two or more pure substances which can be separated by physical means. The three states of matter in nature appear mainly as mixtures of one with the other.
Common mixtures include:
(a)Solutions/solid-liquid dissolved mixture
Experiment:
To make a solution of copper (II) sulphate (VI)/Potassium magnate(VII) /sodium chloride
Procedure
Put about 100 cm3 of water in three separate beakers. Separately place a half spatula end full of copper (II) sulphate (VI), Potassium manganate (VII) and sodium chloride crystals to each beaker. Stir for about two minutes.
Observation
Copper (II) sulphate (VI) crystals dissolve to form a blue solution
Potassium manganate (VII) crystals dissolve to form a purple solution
Sodium chloride crystals dissolve to form a colourless solution
Explanation
Some solids, liquids and gases dissolve in some other liquids.
A substance/liquid in which another substance dissolves is called solvent.
A substance /solid /gas which dissolves in a solvent is called solute.
When a solute dissolves in a solvent it forms a uniform mixture called solution.
A solute dissolved in water as the solvent exists in another state of matter called aqueous state. Water is referred as the universal solvent because it dissolves many solutes. A solute that dissolves in a solvent is said to be soluble. Soluble particles uniformly spread between the particles of water/solvent and cannot be seen.
Solute + Solvent -> solution
Solute + Water -> aqueous solution of solute
The solute dissolved in water gives the name of the solution e. g.
- Sodium chloride solution is a solution formed after dissolving sodium chloride crystals/solid in water. Sodium chloride exists in aqueous state after dissolving.
Sodium chloride + Water -> Sodium chloride solution
NaCl(s) + (aq) -> NaCl(aq)
- Ammonia solution is a solution formed after dissolving ammonia gas in water. Ammonia exists in aqueous state after dissolving.
Ammonia gas + Water -> aqueous ammonia
NH3 (g) + (aq) -> NH3 (aq)
- Copper (II) sulphate (VI) solution is a solution formed after dissolving Copper (II) sulphate (VI) crystals/solid in water. Copper (II) sulphate (VI) exists in aqueous state after dissolving.
Copper (II) sulphate (VI) + Water -> Copper (II) sulphate (VI) solution
CuSO4(s) + (aq) -> CuSO4 (aq)
- Potassium manganate(VII) solution is a solution formed after dissolving Potassium manganate(VII) crystals/solid in water.
Potassium manganate(VII)exist in aqueous state after dissolving.
Potassium manganate(VII) + Water -> Potassium manganate(VII) solution
KMnO4(s) + (aq) -> KMnO4 (aq)
(b)Suspension/ precipitates/solid-liquid mixture which do not dissolve
Experiment: To make soil, flour and Lead (II) Iodide suspension/precipitate
Procedure
Put about 100 cm3 of water in three separate beakers. Separately place a half spatula end full of soil, maize and lead (II) Iodide to each beaker. Stir for about two minutes.
Observation
Some soil, maize and lead (II) Iodide float in the water
A brown suspension/precipitate/particles suspended in water containing soil
A white suspension/precipitate/particles suspended in water containing flour
A yellow suspension/precipitate/particles suspended in water containing Lead (II) iodide. Some soil, maize and lead (II) Iodide settle at the bottom after some time.
Explanation
Some solid substances do not dissolve in a liquid. They are said to be insoluble in the solvent .When an insoluble solid is put in liquid:
(i) Some particles remain suspended/floating in the liquid to form a suspension /precipitate.
(ii) Some particles sink/settle to the bottom to form sediments after being allowed to stand.
An insoluble solid acquire the colour of the suspension/precipitate .e.g.
- A white suspension /precipitate have some fine white particles suspended /floating in the liquid. Not “white solution”
- A blue suspension /precipitate has some fine blue particles suspended /floating in the liquid.
- A green suspension /precipitate has some fine green particles suspended /floating in the liquid.
- A brown suspension /precipitate has some fine brown particles suspended /floating in the liquid.
- A yellow suspension /precipitate has some fine yellow particles suspended /floating in the liquid.
(c) (i) Miscibles /Liquid-liquid mixtures
To form water-ethanol and Kerosene-turpentine miscibles
Procedure
(i)Measure 50cm3 of ethanol into 100cm3 beaker. Measure 50cm3 of water. Place the water into the beaker containing ethanol. Swirl for about one minute.
(ii)Measure 50cm3 of kerosene into 100cm3 beaker. Measure 50cm3 of turpentine oil. Place the turpentine oil into the beaker containing kerosene. Swirl for about one minute.
Observation
Two liquids do not form layers.
Ethanol and water form a uniform mixture.
Kerosene and turpentine oil form uniform mixture
Explanation
Ethanol is miscible in Water. Kerosene is miscible in turpentine oil. Miscible mixture form uniform mixture. They do not form layers. The particles of one liquid are smaller than the particles of the other. The smaller particles occupy the spaces between the bigger particles.
- Immiscibles /Liquid-liquid mixtures
To form water-turpentine oil and Kerosene-water miscibles
Procedure
(i)Measure 50cm3 of water into 100cm3 beaker. Measure 50cm3 of turpentine oil. Place the oil into the beaker containing water. Swirl for about one minute.
(ii) Measure 50cm3 of water into 100cm3 beaker. Measure 50cm3 of kerosene. Place the kerosene into the beaker containing water. Swirl for about one minute.
Observation
Two liquids form layers.
Turpentine and water do not form a uniform mixture.
Water and kerosene do not form uniform mixture
Explanation
Kerosene is immiscible in Water. Water is immiscible in turpentine oil. Immiscible mixtures do not form uniform mixtures. They form layers. The size of the particles of one liquid is almost equal to the particles of the other. The particles of one liquid cannot occupy the spaces between the particles of the other. The heavier particles settle at the bottom. The less dense particles settle on top.
(d)Solid-solid mixtures/Alloys
Before solidifying, some heated molten/liquid metals dissolve in another metal to form a uniform mixture of the two. On solidifying, a uniform mixture of the metals is formed. A uniform mixture of two metals on solidifying is called alloy. In the alloy, one metallic particle occupies the spaces between the metallic particles of the other.
- c) Common alloys of metal.
| Alloy name | Constituents of the alloy | Uses of the alloy |
| Brass | Copper and Zinc | Making screws and bulb caps
|
| Bronze | Copper and Tin | Making clock springs, electrical contacts and copper coins
|
| Soldier | Lead and Tin | Soldering, joining electrical contacts because of its low melting points and high thermal conductivity
|
| Duralumin | Aluminum, Copper and Magnesium | Making aircraft, utensils, and windows frames because of its light weight and corrosion resistant.
|
| Steel | Iron, Carbon ,Manganese and other metals | Railway lines, car bodies girders and utensils. |
| Nichrome | Nichrome and Chromium | Provide resistance in electric heaters and ovens
|
| German silver | Copper, Zinc and Nickel | Making coins
|
METHODS OF SEPARATING MIXTURES
Mixtures can be separated from applying the following methods:
(a) Decantation
Sediments can be separated from a liquid by pouring out the liquid. This process is called decantation.
Experiment
Put some sand in a beaker. Add about 200cm3 of water. Allow sand to settle. Pour off water carefully into another beaker.
Observation
Sand settles at the bottom as sediments.
Less clean water is poured out.
Explanation
Sand does not dissolve in water. Sand is denser than water and thus settles at the bottom as sediment. When poured out, the less dense water flows out.
(b)Filtration
Decantation leaves suspended particles in the liquid after separation. Filtration is thus improved decantation.Filtration is the method of separating insoluble mixtures/particles/solids from a liquid.
Experiment: To separate soil and water using filtration
Fold a filter paper to fit well into a filter funnel. Place the funnel in an empty 250 cm3 beaker.
Put one spatula end full of soil into 50cm3 of water. Stir. Put the soil/water mixture into the filter funnel.
Observations
Clean water is collected below the filter funnel.
Soil remains above the filter paper.
Explanation
A filter paper is porous which act like a fine sieve with very small holes. The holes allow smaller water particles to pass through but do not allow bigger soil particles. The liquid which passes through is called filtrate. The solid which do not pass through is called residue.
Set up of apparatus
In industries, filtration is used in engine filters to clean up air.
(c)Evaporation
Evaporation is a method of separating a solute/solid from its solution. This involves heating a solution (solvent and solute)to vapourize the solvent out of the solution mixture leaving pure solute/solid. If a mixture contain insoluble solid, they are filtered out.
Experiment: To separate a mixture of soil and salt (sodium chloride).
Procedure:
Put one spatula end full of soil on a filter paper.
Put one spatula full of common salt/sodium chloride into the same filter paper. Mix well using the spatula,.
Place about 200cm3 of water into a beaker.
Put the contents of the filter paper into the water. Stir thoroughly using a glass/stirring rod for about one minute.
Fold a filter paper into a filter funnel.
Pour half portion of the contents in the beaker into the filter funnel.
Put the filtrate into an evaporating dish. Heat on a water bath.
Observation
(i)On mixing
Colourless crystals and brown soil particles appear on the filter paper.
(ii)On adding water
Common soil dissolves in water. Soil particles do not dissolve in water.
(iii)On filtration
Colourless liquid collected as filtrate below the filter funnel/paper.
Brown residue collected above the filter funnel/paper.
(iv)On evaporation
Colourless crystals collected after evaporation
Explanation
Solid mixture of sand and common salt take the colors of the two.
On adding water, common salt dissolves to form a solution.
Soil does not because it is insoluble in water and thus forms a suspension.
On filtration, a residue of insoluble soil does not pass through the filter paper.
It is collected as residue.
Common salt solution is collected as filtrate.
On heating the filtrate, the solvent/water evaporate/vaporize out of the evaporating dish leaving common salt crystals.
Vapourization/evaporation can take place even without heating.
This is the principle/process of drying wet clothes on the hanging line.
Set up of apparatus
(d) Distillation
Distillation is an improved evaporation where both the solute and the solvent in the solution are separated /collected. Distillation therefore is the process of separating a solution into constituent solid solute and the solvent. It involves heating the solution to evaporate/vaporize the solvent out. The solvent vapour is then condensed back to a liquid.
Experiment: To obtain copper (II) sulphate (VI) crystals and water from copper (II) sulphate (VI) solution.
Procedure:
Put one spatula end full of copper (II) sulphate (VI) crystals into a 250cm3 beaker.
Place about 200cm3 of water into the beaker.
Stir thoroughly using a glass/stirring rod for about one minute.
Pour half portion of the contents in the beaker into a round bottomed/flat/conical flask broken porcelain/sand/glass into the flask.
Put a few pieces of b Stopper the flask.
Connect the flask to a Liebig condenser using delivery tube.
Place a 200cm3 clean empty beaker/conical flask as a receiver at the end of the Liebig condenser.
Circulate water in the Liebig condenser.
Heat the flask strongly on a tripod stand with wire mesh/gauze until there is no more visible boiling bubbles in the flask.
Observation
Copper (II) sulphate (VI) crystals dissolve in water to form a blue solution.
On heating, colourless liquid is collected in the receiver.
Blue crystals are left in the flask.
(If gently heated further, the blue crystals turn to white powder)
Explanation
On heating blue Copper (II) sulphate (VI) solution, the colourless liquid solvents evaporate/vaporize.
The liquid vapour/gas passes through the delivery tube to the Liebig condenser.
The Liebig condenser has a cold water inlet near the receiver and cold water out let.
This ensures efficient cooling. If the cold water outlet/inlet is reversed, the water circulation would be less efficient.
The water in the receiver would be warm. In the Liebig condenser, the cold water condenses the liquid vapour into liquid.
The condensed liquid collects in the receiver as distillate.
The solute of blue Copper (II) sulphate (VI) crystals is left in the flask as residue.
During simple distillation, therefore, the solution is heated to vaporize /evaporate the solvent/one component which is condensed at a different part of the apparatus.
The purpose of pieces of broken porcelain/porous pot/glass/sand/ is to:
(i) Prevent bumping of the solution during boiling.
(ii) Ensure smooth and even boiling.
Salty sea water can be made pure through simple distillation.
Any mixture with a large difference /40oC in boiling point can be separated using simple distillation.
Set up of apparatus
e)Fractional distillation
Fractional distillation is an improved simple distillation used specifically to separate miscible mixtures with very close /near boiling points.
Fractional distillation involves:
(i) Heating the mixture in a conical/round bottomed /flat bottomed flask.
The pure substance with a lower boiling point and thus more volatile evaporates/boils/vaporize first.e.g. Pure ethanol has a boiling point of 78oC.Pure water has a boiling point of 100 oC at sea level/one atmosphere pressure.
When a miscible mixture of ethanol and water is heated, ethanol vaporizes /boils/ evaporates first because it is more volatile.
(ii)The conical/round bottomed /flat bottomed flask is connected to a long glass tube called fractionating column.
The purpose of the fractionating column is to offer areas of condensation for the less volatile pure mixture.
The fractionating column is packed with glass beads/broken glass/ porcelain/ shelves to increase the surface area of condensation of the less volatile pure mixture.
(iii)When the vapors rise they condense on the glass beads/broken glass /porcelain / shelves which become hot.
When the temperature of the glass beads/broken glass/porcelain/shelves is beyond the boiling point of the less volatile pure substance, the pure substance rise and condensation take place on the glass beads/broken glass/porcelain/shelves at a higher level on the fractionating column.
The less volatile pure substance trickles/drips back down the fractionating column or back into the conical/round bottomed /flat bottomed flask to be heated again. e.g.
If the temperature on glass beads/broken glass/porcelain/shelves is beyond 78oC, the more volatile pure ethanol rise to condense on the glass beads/broken glass /porcelain/shelves higher in the fractionating column.
Water condenses and then drip/trickle to the glass beads/broken glass /porcelain /shelves lower in the fractionating column because it is less volatile.
(iv) The fractionating column is connected to a Liebig condenser. The Liebig condenser has a cold water inlet and outlet circulation.
The more volatile mixture that reach the top of the fractionating column is condenses by the Liebig condenser into a receiver. It is collected as the first fraction.
(v)At the top of the fractionating column, a thermometer is placed to note/monitor the temperature of the boiling mixtures.
Pure substances have constant/fixed boiling point. When one mixture is completely separated, the thermometer reading rises.
E.g. the thermometer reading remains at78oC when ethanol is being separated. When no more ethanol is being separated, the mercury/alcohol level in the thermometer rises.
(vi)The second /subsequent fractions are collected in the receiver after noting a rise the mercury/alcohol level in the thermometer.
E.g. the thermometer reading rises to 100oC when water is being separated. It is passed through the Liebig condenser with the cold water inlet and outlet circulation. It is collected different receiver as the second/subsequent fraction.
(vii)Each fraction collected should be confirmed from known physical/chemical properties/characteristic.
Example
Ethanol
Ethanol is a colourless liquid that has a characteristic smell .When it is put in a watch glass then ignited, it catches fire and burn with a blue flame.
Water
Water is a colourless liquid that has no smell/odour .When it is put in a watch glass then ignited, it does not catch fire.
Set up of apparatus
Industrial application of Fractional distillation
On a large scale,fractional distillation is used:
(i)In fractional distillation of crude oil in an oil refinery.
Crude oil is a mixture of many fractions. When heated in a furnace, the different fractions separate out according to their boiling point. In Kenya,fractional distillation takes place at Changamwe in Mombasa.
(ii)In fractional distillation of air.
Air contain a mixture of three main useful gases which are condensed by cooling to very low temperature (-200oC) to form a liquid. The liquid is then heated. Nitrogen is the most volatile (-196 oC) and thus comes out as the first fraction. Argon (at -186 oC) is the second fraction. Oxygen ( at -183 oC) is the last fraction. The three gases are very useful industrial gases.
(f)Separation of immiscibles (Using a separating funnel)
Two or more liquids that form layers on mixing are immiscible. Immiscible mixture arrange themselves according to their densities
i.e. The denser liquid sink to the bottom. The less dense liquid floats on the denser one. Immicible mixtures can be separated from each other by using a separating funnel.
Experiment: To separate an immiscible mixture of paraffin and water.
Procedure
Place about 100cm3 of water into a 250cm3 beaker. Add about 100cm3 of paraffin into the beaker. Stir.
Transfer the mixture into a separating funnel. Allow to settle for about one minute. Open the tap, run out the lower layer out slowly into a clean beaker. Close the tap when the upper layer is very close to the tap.
Run out the intermediate small amount of the mixture near the tap into a beaker. Discard it.
Run out the remaining upper layer into a fresh beaker.
Place a portion of upper and lower layer into a watch glass separately after separating each. Ignite.
Observation
Water and paraffin are both colourless liquids.
Two layers are formed on mixing.
Colourless odorless liquid collected first. It does not catch fire.
A colourless liquid with characteristic smell collected later/second. It catches fire and burn with a yellow smoky flame.
Explanation
Water and paraffin are immiscible. Water is denser than paraffin. When put in a separating funnel, paraffin float on water. On opening the tap, water runs out. A mixture of water and paraffin at the junction of the two is discarded. It is not pure.
Set up of apparatus
(g)Sublimation/deposition
Some solids on heating do not melt to a liquid but change directly to a gas. The process by which a solid changes to a gas is called sublimation. The gas cools back and changes directly to a solid. The process by which a gas changes to a solid is called deposition. Sublimation and deposition therefore are the same but opposite processes.
| GAS |
Sublimation Deposition
| SOLID |
Some common substances that undergo sublimation/ deposition include:
(i)Iodine (ii)Carbon(IV)oxide (iii)Camphor (iv) ammonium chloride (v)Iron(III)chloride (vi)Aluminum(III)chloride
(vii) benzoic acid
If a mixture has any of the above as a component, then on heating it will change to a gas and be deposited away from the source of heating.
Procedure
Place about one spatula full of ammonium chloride crystals into a clean dry 100cm3 beaker. Add equal amount of sodium chloride crystals into the beaker. Swirl to mix.
Place the beaker on a tripod stand.
Put about 100cm3 of water into another beaker. Place carefully the beaker containing water on top of the beaker containing the solid mixture. Light/ignite a burner and heat the solid.
Set up of apparatus:
Observation
(i)With ammonium chloride/common salt mixture
White fumes produced.
White sublimate deposited
Colourless residue left
(ii)With Iodine/common salt mixture
Purple fumes produced.
Dark grey sublimate deposited
Colourless residue left
Explanation
(i)On heating a mixture of ammonium chloride and common salt, a white fume of ammonium chloride is produced. The white fumes solidify as white sublimate on the cooler parts. Common salt remains as residue.
Chemical equation:
Ammonium chloride solid Ammonium chloride gas
NH4Cl(s) NH4Cl(g)
(ii)On heating a mixture of Iodine and common salt, a purple fume of Iodine vapour is produced. The purple fumes solidify as dark grey sublimate on the cooler parts. Common salt remains as residue.
Chemical equation:
Iodine solid Iodine gas
I2(s) I2 (g)
(h)Chromatography
Chromatography is a method of separating components of a solution mixture by passing it through a medium where the different components move at different rates. The medium through which the solution mixture is passed is called absorbent material.
Paper chromatography is a method of separating colored dyes by using paper as the absorbent material.
Since dyes are insoluble/do not dissolve in water, ethanol and propanone are used as suitable solvents for dissolving the dye.
Practically, a simple paper chromatography involve placing a dye/material on the absorbent material, adding slowly a suitable soluble solvent on the dye/material using a dropper, the solvent spread out on the absorbent material carrying the soluble dye away from the origin.
The spot on which the dye is initially/originally placed is called baseline. The farthest point the solvent spread is called solvent front.
The farthest a dye can be spread by the solvent depend on:
(i) Density of the dye-the denser the dye, the less it spread from the basely ne by the solvent.
(ii) Stickiness of the dye-some dyes sticks on the absorbent material more than other thus do not spread far from baseline.
Experiment: To investigate the colors in ink
Procedure
Method 1
Place a filter paper on an empty beaker. Put a drop of black/blue ink in the centre of the filter paper. Wait for about one minute for the ink drop to spread. Using a clean teat pipette/dropper add one drop of ethanol/propanone. Wait for about one minute for the ink drop to spread further. Add about twenty other drops of ethanol waiting for about one minute before each addition. Allow the filter paper to dry.
Experiment: To investigate the colors in ink
Procedure
Method 2
Cut an 8 centimeter thin strip of a filter paper. At about 3cm on the strip, place a drop of ink. Place the filter paper in a 10cm length boiling tube containing 5cm3 of ethanol. Ensure the cut strip of the filter paper just dips into the ethanol towards the ink mark. Cover the boiling tube. Wait for about twenty minutes. Remove the boiling tube and allow the filter paper to dry.
Set up of apparatus
Method 1
Set up of apparatus
Method 2
Explanation
When a drop of ink is placed on an absorbent material it sticks. On adding an eluting solvent, it dissolves the dye spread out with it. The denser and sticky pure dye move least. The least dense/sticky pure dye move farthest. A pure dye will produce the same chromatogram/spot if the same eluting solvent is used on the same absorbent material. Comparing the distance moved by a pure dye with a mixture, the coloured dyes in a mixture can be deduced as below:
Example 1
The chromatogram of pure dyes A, B ,C and a dye mixture D is shown below Determine the pure dyes present in D. On the diagram show:
(i)the solvent front
(ii) Baseline
(Iii) the most soluble pure dye
(i) Solvent extraction
Solvent extraction is a method of separating oil from nuts/seeds. Most nuts contain oil. First the nuts are crushed to reduce their size and increase the surface area. A suitable volatile solvent is added. The mixture is filtered. The filtrate solvent is then allowed to crystallize leaving the oil/fat. If a filter paper is rubbed/smeared with the oil/fat, it becomes translucent. This is the test for the presence of oil/fat.
Experiment: To extract oil from Macadamia nut seeds
Procedure
Crush Macadamia nut seeds form the hard outer cover .Place the inner soft seed into a mortar. Crush (add a little sand to assist in crushing).
Add a little propanone and continue crushing. Continue crushing and adding a little propanone until there is more liquid mixture than the solid. Decant/filter. Put the filtrate into an evaporating dish. Vapourize the solvent using solar energy /sunlight. Smear/rub a portion of the residue left after evaporation on a clean dry filter paper.
Observation /Explanation
Propanone dissolve fat/oil in the macadamia nuts. Propanone is more volatile (lower boiling point) than oil/fat. In sunlight/solar energy, propanone evaporate/vaporize leaving oil/fat(has a higher boiling point).Any seed like corn, wheat , rice, soya bean may be used instead of macadamia seed. When oil/fat is rubbed/ smeared on an opaque paper, it becomes translucent.
(j) Crystallization
Crystallization is the process of using solubility of a solute/solid to obtain the solute/solid crystals from a saturated solution by cooling or heating the solution.
A crystal is the smallest regular shaped particle of a solute. Every solute has unique shape of its crystals.
Some solutions form crystals when heated. This is because less solute dissolves at higher temperature. Some other solutions form crystals when cooled. This is because less solute dissolves at lower temperature.
Experiment; To crystallize copper (II) sulphate (VI) solution
Procedure:
Place about one spatula full of hydrated copper sulphate (VI) crystals into 200cm3 of distilled water in a beaker. Stir. Continue adding a little more of the hydrated copper sulphate (VI) crystals and stirring until no more dissolve. Decant/filter. Cover the filtrate with a filter paper. Pierce and make small holes on the filter paper cover. Preserve the experiment for about seven days.
Observation/Explanation
Large blue crystals formed
When hydrated copper (II) sulphate crystals are placed in water, they dissolve to form copper (II) sulphate solution. After some days water slowly evaporate leaving large crystals of copper (II) sulphate. If the mixture is heated to dryness, small crystals are formed.
Physical/Temporary and Chemical changes
A physical/temporary change is one which no new substance is formed and is reversible back to original.
A chemical/permanent change is one which a new substance is formed and is irreversible back to original.
The following experiments illustrates physical and chemical changes
(a)Heating ice
Place about 10g of pure ice in a beaker. Determine its temperature. Record it at time “0.0” in the table below. Heat the ice on a strong Bunsen flame and determine its temperature after every 60seconds/1minute to complete the table below:
| Time/minutes | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Temperature (oC) | -2 | 0 | 0 | 40 | 80 | 90 | 95 | 95 | 96 |
Plot a graph of time against Temperature (y-axes)
Explain the shape of your graph
Melting/freezing/fusion/solidification and boiling /vaporization /evaporation are the two physical processes.
Melting /freezing point of pure substances is fixed /constant.
The boiling point of pure substance depends on external atmospheric pressure.
Melting/fusion is the physical change of a solid to liquid.
Freezing is the physical change of a liquid to solid.
Melting/freezing/fusion/solidification is therefore two opposite but same reversible physical processes i.e.
A (s) A (l)
Boiling/vaporization/evaporation is the physical change of a liquid to gas.
Condensation/ liquidification is the physical change of gas to liquid.
Boiling/vaporization/evaporation and condensation/ liquidification are therefore two opposite but same reversible physical processes i.e.
B (l) B(g)
Practically
(i) Melting/liquidification/fusion involves heating a solid to weaken the strong bonds holding the solid particles together.
Solids are made up of very strong bonds holding the particles very close to each other (Kinetic Theory of matter).
On heating these particles gain energy/heat from the surrounding heat source to form a liquid with weaker bonds holding the particles close together but with some degree of freedom.
(ii)Freezing/fusion/solidification involves cooling a liquid to reform /rejoin the very strong bonds to hold the particles very close to each other as solid and thus lose their degree of freedom (Kinetic Theory of matter).
Freezing /fusion / solidification is an exothermic (–∆H) process that require particles holding the liquid together to lose energy to the surrounding.
(iii)Boiling/vaporization/evaporation involves heating a liquid to completely break/free the bonds holding the liquid particles together.
Gaseous particles have high degree of freedom (Kinetic Theory of matter).
Boiling /vaporization / evaporation is an endothermic (+∆H) process that require/absorb energy from the surrounding.
(iv)Condensation/liquidification is reverse process of boiling /vaporization / evaporation.
It involves gaseous particles losing energy to the surrounding to form a liquid.
AIR OXYGEN AND COMBUSTION
A.THE ATMOSPHERE
- The atmosphere is made up of air. Air is a mixture of colourless, odorless gases which is felt as wind (air in motion).All living things breath in air for respiration. Plants use air for respiration and photosynthesis.
- The main gases present in the atmosphere/air:
| Gas | Approximate % composition by volume |
| Nitrogen | 78.0 |
| Oxygen | 21.0 |
| Carbon(IV)oxide | 0.03 |
| Noble gases | 1.0 |
| Water vapour | Vary from region |
- The following experiments below shows the presence and composition of the gases in air/atmosphere
(a)To find the composition of air supporting combustion using a candle stick
Procedure
Measure the length of an empty gas jar M1. Place a candle stick on a Petri dish. Float it on water in basin/trough. Cover it with the gas jar. Mark the level of the water in the gas jar M2. Remove the gas jar. Light the candle sick. Carefully cover it with the gas jar. Observe for two minutes. Mark the new level of the water M3.
Set up of apparatus
Sample observations
Candle continues to burn then extinguished/goes off
Level of water in the gas jar rises after igniting the candle
Length of empty gas jar = M1= 14cm
Length of gas jar without water before igniting candle = M2= 10 cm
Length of gas jar with water before igniting candle = M1 – M2= 14- 10 = 4 cm
Length of gas jar with water after igniting candle = M3 = 8 cm
Length of gas jar without water after igniting candle = M1 – M3 = 10 -8 = 2 cm
Explanation
Candle burns in air. In a closed system (vessel), the candle continues to burn using the part of air that support burning/combustion. This is called the active part of air. The candle goes off/extinguished when all the active part of air is used up. The level of the water rises to occupy the space /volume occupied by the used active part of air.
The experiment is better when very dilute sodium/potassium hydroxide is used instead of water. Dilute Potassium/ sodium hydroxide absorb Carbon (IV) oxide gas that comes out from burning/combustion of candle stick.
From the experiment above the % composition of the:
(i) Active part of air can be calculated:
M2 – M3 x 100% => 10- 8 x 100% = 20%
M2 10cm
(ii) Inactive part of air can be calculated:
100% –20% = 80% // M3 => 8 x 100% = 80%
M2 10cm
(b)To find the composition of active part of air using heated copper turnings.
Procedure
Clamp a completely packed/filled open ended glass tube with copper turnings. Seal the ends with glass/cotton wool.
Label two graduated syringes as “A” and “B” Push out air from syringe “A”. Pull in air into syringe “B”.
Attach both syringe “A” and “B” on opposite ends of the glass tube.
Determine and record the volume of air in syringe “B” V1.
Heat the glass tube strongly for about three minutes.
Push all the air slowly from syringe “B” to syringe “A” as heating continues. Push all the air slowly from syringe “A” back to syringe “B” and repeatedly back and forth.
After about ten minutes, determine the new volume of air in syringe “B” V2
Set up of apparatus
Sample observations
Colour change from brown to black
Volume of air in syringe “B” before heating V1 = 158.0cm3
Volume of air in syringe “B” after heating V2 = 127.2cm3
Volume of air in syringe “B” used by copper V1 – V2 = 30.8cm3
Sample questions
- What is the purpose of:
(i) glass/cotton wool
To prevent/stop copper turnings from being blown into the syringe/out of the glass tube
(ii) Passing air through the glass tube repeatedly
To ensure all the active part of air is used up
(iii) Passing air through the glass tube slowly
To allow enough time of contact between the active part of and the heated copper turnings
- State and explain the observations made in the glass tube.
Colour change from brown to black
Brown copper metal reacts with the active part of air/oxygen to form black copper (II) oxide.
Chemical equation
Copper + Oxygen -> Copper (II) oxide
2Cu(s) + O2 (g) -> 2CuO(s)
The reaction reduces the amount/volume of oxygen in syringe “B” leaving the inactive part of air. Copper only react with oxygen when heated.
- Calculate the % of
(i) Active part of air
% active part of air = V1 – V2 x 100% => 30.8cm3 x 100% = 19.493%
V1 158.0cm3
(ii) Inactive part of air
Method 1
% inactive part of air = V2 x 100% =>127.2cm3 x 100% = 80.506%
V1 158.0cm3
Method 2
% inactive part of air = 100% -% active part of air
=> 100 % – 19.493 % = 80.507%
- The % of active part of air is theoretically higher than the above while % of inactive part of air is theoretically lower than the above. Explain.
Not all the active part of air reacted with copper
- State the main gases that constitute:
(a )active part of air.
Oxygen
(b) Inactive part of air
Nitrogen, carbon (IV) oxide and noble gases
- If the copper turnings are replaced with magnesium shavings the % of active part of air obtained is extraordinary very high. Explain.
Magnesium is more reactive than copper. The reaction is highly exothermic. It generates enough heat for magnesium to react with both oxygen and nitrogen in the air.
A white solid/ash mixture of Magnesium oxide and Magnesium nitride is formed. This considerably reduces the volume of air left after the experiment.
Chemical equation
Magnesium + Oxygen -> magnesium (II) oxide
2Mg(s) + O2 (g) -> 2MgO(s)
Magnesium + Nitrogen -> magnesium (II) nitride
3Mg(s) + N2 (g) -> Mg3N2 (s)
(c)To find the composition of active part of air using alkaline pyrogallol
Procedure
Measure about 2cm3 of dilute sodium hydroxide into a graduated gas jar. Record the volume of the graduated cylinder V1.
Place about two spatula end full of pyrogallol/1, 2, 3-trihydroxobenzene into the gas jar. Immediately place a cover slip firmly on the mouth of the gas jar. Swirl thoroughly for about two minutes.
Invert the gas jar in a trough/basin containing water. Measure the volume of air in the gas jar V2
Sample observations
Colour of pyrogallol/1, 2, 3-trihydroxobenzene change to brown.
Level of water in gas jar rises when inverted in basin/trough.
Volume of gas jar /air in gas jar V1= 800cm3
Volume of gas jar /air in gas jar after shaking with alkaline pyrogallol/1, 2, 3-trihydroxobenzene V2= 640 cm3
Sample questions
- Which gas is absorbed by alkaline pyrogallol/1,2,3-trihydroxobenzene
Oxygen
- Calculate the
(i) % of active part of air
V1-V2 x 100% => (800cm3 – 640 cm3) x 100% = 20%
V1 800cm3
(ii) % of inactive part of air
V2 x 100% => 640 cm3 x 100% = 80%
V1 800cm3
(d)To establish the presence of carbon (IV) oxide in air using lime water
Pass tap water slowly into an empty flask as in the set up below
Sample observation questions
- What is the purpose of paper cover?
To ensure no air enters into the lime water.
- What happens when water enters the flask?
It forces the air from the flask into the lime water.
- What is observed when the air is bubbled in the lime water?
A white precipitate is formed. The white precipitate dissolves on prolonged bubbling of air.
- (a) Identify the compound that form:
(i)lime water
Calcium hydroxide / Ca(OH)2
(ii) White precipitate
Calcium carbonate/ CaCO3
(iii) When the white precipitate dissolves
Calcium hydrogen carbonate/ CaHCO3
(b)Write the chemical equation for the reaction that tale place when:
(i) White precipitate is formed
Calcium hydroxide + carbon (IV) oxide -> Calcium carbonate + water
Ca (OH) 2(aq) + CO2 (g) -> CaCO3(s) + H2O (l)
(ii) White precipitate dissolves
Calcium carbonate + water+ carbon (IV) oxide -> Calcium hydrogen carbonate
CaCO3(s) + H2O (l) + CO2 (g) -> CaHCO3 (aq)
- State the chemical test for the presence of carbon (IV) oxide gas based on 4(a) and (b) above:
Carbon (IV) oxide forms a white precipitate with lime water that dissolves in excess of the gas.
- State the composition of carbon (IV) oxide gas by volume in the air.
About 0.03% by volume
B.OXYGEN
- a) Occurrence.
- Fifty 50% of the earth’s crust consist of Oxygen combined with other elements e.g. oxides of metals
- About 70% of the earth is water made up of Hydrogen and Oxygen.
- About 20% by volume of the atmospheric gases is Oxygen that form the active part of air.
- b) School laboratory preparation.
Oxygen was first prepared in 1772 by Karl Scheele and later in 1774 by Joseph Priestly. It was Antony Lavoisier who gave it the name “Oxygen”
Procedure
Method 1: Using Hydrogen peroxide
Half fill a trough/basin with tap water. Place a bee hive shelf/stand into the water.
Completely fill the gas jar with water and invert in onto the bee hive shelf/stand.
Clamp a round bottomed flask and set up the apparatus as below.
Collect several gas jars of Oxygen covering each sample.
Sample observation questions
- What is observed when the hydrogen peroxide is added into the flask?
Rapid effervescence/bubbling/fizzing
- Describe the colour and smell of the gas
Colourless and odorless
- (a)Name the method of gas collection used.
–Over water
-Upward delivery
-Down ward displacement of water
(b)What property of Oxygen makes it to be collected using the method above?
-Slightly soluble in water
- What is the purpose of manganese (IV) oxide?
Manganese (IV) oxide is catalyst.
A catalyst is a substance that speeds up the rate of a chemical reaction but remain chemically unchanged at the end of the reaction.
Hydrogen peroxide decomposes slowly to form water and Oxygen gas.
A little Manganese (IV) oxide speeds up the rate of decomposition by reducing the time taken for a given volume of Oxygen to be produced.
- Write the equation for the reaction.
Hydrogen peroxide -> Water + Oxygen
2H2O2 (aq) -> 2H2O (l) + O2 (g)
- Lower a glowing splint slowly into a gas jar containing Oxygen gas. State what is observed.
The glowing splint relights/rekindles
Oxygen relights/rekindles a glowing splint. This is the confirmatory test for the presence of Oxygen gas
Method 1: Using Sodium peroxide
Half fill a trough/basin with tap water. Add four drops of phenolphthalein indicator.
Place a bee hive shelf/stand into the water.
Completely fill a gas jar with water and invert in onto the bee hive shelf/stand.
Clamp a round bottomed flask and set up the apparatus as below.
Collect several gas jars of Oxygen covering each sample.
Sample observation questions
- What is observed when water is added?
(i) Into the flask containing sodium peroxide
Rapid effervescence/bubbling/fizzing
(ii) Phenolphththalein
Remains colourless /Phenolphthalein indicator is colourless in neutral solution
- Describe the colour and smell of the gas
Colourless and odorless
3.(a)Name the method of gas collection used.
–Over water. Oxygen is slightly soluble in water.
- Test the gas by lowering a glowing splint slowly into a gas jar containing the prepared sample.
The glowing splint relights/rekindles. This confirms the presence of Oxygen gas
- Write the equation for the reaction.
Sodium peroxide + Water -> Sodium hydroxide + Oxygen
2Na2O2 (aq) + 2H2O (l) -> 4NaOH (aq) + O2 (g)
- Test the gas by lowering a glowing splint slowly into a gas jar containing the prepared sample.
The glowing splint relights/rekindles.
This confirms the presence of Oxygen gas
- Write the equation for the reaction.
Potassium Chlorate (V) -> Potassium Chloride + Oxygen
2KClO3 (aq) -> 2KCl (aq) + 3O2 (g)
- What is the purpose of manganese (IV) oxide?
Manganese (IV) oxide is catalyst.
A catalyst is a substance that speeds up the rate of a chemical reaction but remain chemically unchanged at the end of the reaction.
Potassium Chlorate (V) decomposes slowly to form potassium chloride and Oxygen gas.
A little Manganese (IV) oxide speeds up the rate of decomposition by reducing the time taken for a given volume of Oxygen to be produced.
(c)Uses of Oxygen
- Oxygen is put in cylinders for use where natural supply is not sufficiently enough. This is mainly in:
(i)Mountain climbing/Mountaineering-at high altitudes, the concentration of air/oxygen is low. Mountain climbers must therefore carry their own supply of oxygen for breathing.
(ii) Deep sea diving-Deep sea divers carry their own supply of Oxygen.
(iii) Saving life in hospitals for patients with breathing problems and during anesthesia.
- A mixture of oxygen and some other gases produces a flame that is very hot.
(i) Oxy-acetylene/ethyne flame is produced when Ethyne/acetylene gas is burnt in pure oxygen. The flame has a temperature of about 3000oC.It is used for welding /cutting metals.
(ii)Oxy-hydrogen flame is produced when Hydrogen is burn in pure oxygen. The flame has a temperature of about 2000oC.It is used also for welding /cutting metals.
- Oxy-hydrogen mixture is used as rocket fuel
- A mixture of charcoal, petrol and liquid Oxygen is an explosive.
(d) Chemical properties of Oxygen /combustion.
Oxygen is a very reactive non metal. Many elements react with oxygen through burning to form a group of compounds called Oxides.
Burning/combustion is the reaction of Oxygen with an element/substances.
Reaction in which a substance is added oxygen is called Oxidation reaction. Burning/combustion are an example of an oxidation reaction.
Most non metals burn in Oxygen/air to form an Oxide which in solution / dissolved in water is acidic in nature. They turn blue litmus red.e.g. Carbon (IV) oxide/CO2, Nitrogen (IV) oxide/ NO2, Sulphur (IV) oxide/ SO2
Some non metals burn in Oxygen/air to form an Oxide which in solution / dissolved in water is neutral in nature. They don’t turn blue or red litmus. E.g. Carbon (II) oxide/CO, Water/ H2O
All metals burns in Oxygen/air to form an Oxide which in solution/dissolved in water is basic/alkaline in nature. They turn red litmus blue.e.g.
Magnesium oxide/MgO, Sodium Oxide/ Na2O, Copper (II) oxide/CuO
Elements/substances burn faster in pure Oxygen than in air
Air contains the inactive part of air that slows the rate of burning of substances/elements.
(i)Reaction of metals with Oxygen/air
The following experiments show the reaction of metals with Oxygen and air.
- Burning Magnesium
Procedure
(a)Cut a 2cm length piece of magnesium ribbon. Using a pair of tongs introduce it to a Bunsen flame. Remove it when it catches fire. Observe.
Place the products in a beaker containing about 5cm3 of water. Test the solution/mixture using litmus papers
(b)Cut another 2cm length piece of magnesium ribbon. Using a pair of tongs introduce it to a Bunsen flame. When it catches fire, lower it slowly into a gas jar containing Oxygen.
Place about 5cm3 of water into the gas jar. Test the solution/mixture using litmus papers. Test the solution/mixture using litmus papers
Observations
(a)In air
Magnesium burns with a bright blindening flame in air forming white solid/ash /powder. Effervescence/bubbles/ fizzing Pungent smell of urine. Blue litmus paper remains blue. Red litmus paper turns blue
(b) In pure Oxygen
Magnesium burns faster with a very bright blindening flame pure oxygen forming white solid/ash /powder. No effervescence/bubbles/ fizzing. No pungent smell of urine. Blue litmus paper remains blue. Red litmus paper turns blue
Explanation
Magnesium burns in air producing enough heat energy to react with both Oxygen and Nitrogen to form Magnesium Oxide and Magnesium nitride. Both Magnesium Oxide and Magnesium nitride are white solid/ash /powder.
Chemical equations
Magnesium + Oxygen -> Magnesium Oxide
2Mg(s) + O2(g) -> 2MgO(s)
Magnesium + Nitrogen -> Magnesium Nitride
3Mg(s) + N2(g) -> Mg3N2 (s)
Magnesium Oxide dissolves in water to form a basic/alkaline solution of Magnesium hydroxide
Chemical equations
Magnesium Oxide + Water -> Magnesium hydroxide
2Mg(s) + O2 (l) -> 2MgO(s)
Magnesium Nitride dissolves in water to form a basic/alkaline solution of Magnesium hydroxide and producing Ammonia gas. Ammonia is also an alkaline/basic gas that has a pungent smell of urine.
Chemical equations
Magnesium Nitride + Water -> Magnesium hydroxide + Ammonia gas
Mg3N2 (s) + 6H2O (l) -> 3Mg (OH)2 (aq) + 2NH3(g)
- Burning Sodium
Procedure
(a)Carefully cut a very small piece of sodium. Using a deflagrating spoon introduce it to a Bunsen flame. Remove it when it catches fire. Observe.
Place the products in a beaker containing about 20cm3 of water. Test the solution/mixture using litmus papers
(b) Carefully cut another very small piece of sodium. Using a deflagrating spoon introduce it to a Bunsen flame. When it catches fire, lower it slowly into a gas jar containing Oxygen.
Place about 20 cm3 of water into the gas jar. Test the solution/mixture using litmus papers. Test the solution/mixture using litmus papers
Observations
(a)In air
Sodium burns with a yellow flame in air forming a black solid. Blue litmus paper remains blue. Red litmus paper turns blue
(b) In pure Oxygen
Sodium burns faster with a golden yellow flame in pure oxygen forming a yellow solid. Effervescence/bubbles/ fizzing. Gas produced relights glowing splint. Blue litmus paper remains blue. Red litmus paper turns blue.
Explanation
(a)Sodium burns in air forming black Sodium Oxide
Chemical equations
Sodium + Oxygen/air -> Sodium Oxide
4Na(s) + O2 (g) -> 2Na2O(s)
Sodium Oxide dissolves in water to form a basic/alkaline solution of Sodium hydroxide
Chemical equations
Sodium Oxide + Water -> Sodium hydroxide
Na2O(s) + H2O (l) -> 2NaOH (aq)
(b)Sodium burns in pure oxygen forming yellow Sodium peroxide
Chemical equations
Sodium + Oxygen -> Sodium peroxide
2Na(s) + O2 (g) -> Na2O2 (s)
Sodium peroxide dissolves in water to form a basic/alkaline solution of Sodium hydroxide. Oxygen is produced.
Chemical equations
Sodium Oxide + Water -> Sodium hydroxide + Oxygen
2Na2O2 (s) + 2H2O (l) -> 4NaOH (aq) + O2 (l)
III. Burning Calcium
Procedure
(a)Using a pair of tongs hold the piece of calcium on a bunsen flame.
Observe.
Place the products in a beaker containing about 2cm3 of water. Test the solution/mixture using litmus papers
(b)Using a pair of tongs hold another piece of calcium on a Bunsen flame. Quickly lower it into a gas jar containing Oxygen gas .Observe.
Place about 2cm3 of water. Swirl.
Test the solution/mixture using litmus papers
Observations
(a)In air
Calcium burns with difficulty producing a faint red flame in air forming a white solid. Blue litmus paper remains blue. Red litmus paper turns blue
(b) In pure Oxygen
Calcium burns with difficulty producing a less faint red flame Oxygen forming a white solid. Blue litmus paper remains blue. Red litmus paper turns blue
Explanation
(a)Calcium burns in air forming white calcium Oxide. Calcium Oxide coat/cover the calcium preventing further burning.
Chemical equations
Calcium + Oxygen/air -> calcium Oxide
2Ca(s) + O2(g) -> 2CaO(s)
Small amount of Calcium Oxide dissolves in water to form a basic/alkaline solution of Calcium hydroxide. The common name of Calcium hydroxide is lime water.
Chemical equations
Calcium Oxide + Water -> Calcium hydroxide
CaO(s) + H2O (l) -> Ca (OH) 2 (aq)
- Burning Iron
Procedure
(a)Using a pair of tongs hold the piece of Iron wool/steel wire on a Bunsen flame.
Observe.
Place the products in a beaker containing about 2cm3 of water. Test the solution/mixture using litmus papers
(b)Using a pair of tongs hold another piece of Iron wool/steel wire on a Bunsen flame.
Quickly lower it into a gas jar containing Oxygen gas .Observe.
Place about 2cm3 of water. Swirl. Test the solution/mixture using litmus papers
Observations
(a)In air
Iron wool/steel wire burns producing an Orange flame in air forming a brown solid. Blue litmus paper remains blue. Red litmus paper turns faint blue
(b) In pure Oxygen
Iron wool/steel wire burns producing a golden Orange flame in Oxygen forming a Brown solid. Blue litmus paper remains blue. Red litmus paper turns faint blue
Explanation
(a)Iron burns in air forming brown Iron (III) Oxide
Chemical equations
Iron + Oxygen/air -> Iron (III) Oxide
4Fe(s) + 3O2 (g) -> 2Fe2O3(s)
Very small amount of Iron (III) Oxide dissolves in water to form a weakly basic/alkaline brown solution of Iron (III) hydroxide.
Chemical equations
Calcium Oxide + Water -> Iron (III) hydroxide
Fe2O3(s) + 3H2O (l) -> 2Fe (OH) 3 (s)
- Burning Copper
Procedure
(a)Using a pair of tongs hold the piece of copper turnings/shavings on a Bunsen flame.
Observe.
Place the products in a beaker containing about 2cm3 of water. Test the solution/mixture using litmus papers
(b)Using a pair of tongs hold another piece of Copper turnings/shavings on a Bunsen flame. Quickly lower it into a gas jar containing Oxygen gas .Observe.
Place about 2cm3 of water. Swirl. Test the solution/mixture using litmus papers
Observations
(a)In air
Copper turnings/shavings burns with difficulty producing a green flame in air forming a black solid. Blue litmus paper remains blue. Red litmus paper turns faint blue
(b) In pure Oxygen
Copper turnings/shavings burns less difficulty producing a green flame in Oxygen forming a Brown solid. Blue litmus paper remains blue. Red litmus paper turns faint blue
Explanation
(a)Copper burns in air forming black Copper (II) Oxide
Chemical equations
Copper + Oxygen/air -> Copper (II) Oxide
2 Cu(s) + O2 (g) -> 2CuO(s)
Very small amount of Copper (II) Oxide dissolves in water to form a weakly basic/alkaline blue solution of Copper (II) hydroxide.
Chemical equations
Copper (II) Oxide + Water -> Copper (II) hydroxide
CuO(s) + H2O (l) -> Cu (OH) 2 (s)
(i)Reaction of non metals with Oxygen/air
The following experiments show the reaction of non metals with Oxygen and air.
- Burning Carbon
Procedure
(a)Using a pair of tongs hold a dry piece of charcoal on a Bunsen flame.
Observe.
Place the products in a beaker containing about 2cm3 of water. Test the solution/mixture using litmus papers
(b)Using a pair of tongs hold another piece of dry charcoal on a Bunsen flame. Quickly lower it into a gas jar containing Oxygen gas .Observe.
Place about 2cm3 of water. Swirl. Test the solution/mixture using litmus papers
Observations
-Carbon chars then burns with a blue flame
-Colourless and odorless gas produced
-Solution formed turn blue litmus paper faint red.
Red litmus paper remains red.
Explanation
Carbon burns in air and faster in Oxygen with a blue non-sooty/non-smoky flame forming Carbon (IV) oxide gas.
Carbon burns in limited supply of air with a blue non-sooty/non-smoky flame forming Carbon (IV) oxide gas.
Carbon (IV) oxide gas dissolves in water to form weak acidic solution of Carbonic (IV) acid.
Chemical Equation
Carbon + Oxygen -> Carbon (IV) oxide
(excess air/oxygen)
C(s) + O2 (g) -> CO2 (g) (in excess air)
Carbon + Oxygen -> Carbon (II) oxide
(limited air/oxygen)
2C(s) + O2 (g) -> 2CO (g) (in limited air)
Carbon (IV) oxide + Water -> Carbonic (IV) acid
CO2 (g) + H2O (l) -> H2CO3 (aq) (very weak acid)
- Burning Sulphur
Procedure
(a)Using a deflagrating spoon place sulphur powder on a Bunsen flame.
Observe.
Place the products in a beaker containing about 3cm3 of water. Test the solution/mixture using litmus papers
(b) Using a deflagrating spoon place sulphur powder on a Bunsen flame. Slowly lower it into a gas jar containing Oxygen gas. Observe.
Place about 5cm3 of water. Swirl. Test the solution/mixture using litmus papers.
Observations
-Sulphur burns with a blue flame
-Gas produced that has pungent choking smell
-Solution formed turn blue litmus paper faint red.
Red litmus paper remains red.
Explanation
Sulphur burns in air and faster in Oxygen with a blue non-sooty/non-smoky flame forming Sulphur (IV) oxide gas.
Sulphur (IV) oxide gas dissolves in water to form weak acidic solution of Sulphuric (IV) acid.
Chemical Equation
Sulphur + Oxygen -> Sulphur (IV) oxide
S(s) + O2 (g) -> SO2 (g) (in excess air)
Sulphur (IV) oxide + Water -> Sulphuric (IV) acid
SO2 (g) + H2O (l) -> H2SO3 (aq) (very weak acid)
III. Burning Phosphorus
Procedure
(a)Remove a small piece of phosphorus from water and using a deflagrating spoon (with a lid cover) places it on a Bunsen flame.
Observe.
Carefully put the burning phosphorus to cover gas jar containing about 3cm3 of water. Test the solution/mixture using litmus papers
(b) Remove another small piece of phosphorus from water and using a deflagrating spoon (with a lid cover) place it on a Bunsen flame.
Slowly lower it into a gas jar containing Oxygen gas with about 5 cm3 of water. Observe.
Swirl. Test the solution/mixture using litmus papers.
Observations
-Phosphorus catches fire before heating on Bunsen flame
-Dense white fumes of a gas produced that has pungent choking poisonous smell
-Solution formed turn blue litmus paper faint red.
Red litmus paper remains red.
Explanation
Phosphorus is stored in water. On exposure to air it instantaneously fumes then catch fire to burn in air and faster in Oxygen with a yellow flame producing dense white acidic fumes of Phosphorus (V) oxide gas.
Phosphoric (V) oxide gas dissolves in water to form weak acidic solution of Phosphoric (V) acid.
Chemical Equation
Phosphorus + Oxygen -> Phosphorous (V) oxide
4P(s) + 5O2 (g) -> 2P2O5(s)
Phosphorous (V) oxide + Water -> Phosphoric (V) acid
P2O5(s) + 3H2O (l) -> 2H3PO4 (aq) (very weak acid)
(e) Reactivity series/competition for combined Oxygen.
The reactivity series is a list of elements/metals according to their affinity for oxygen.
Some metals have higher affinity for Oxygen than others.
A metal/element with higher affinity for oxygen is placed higher/on top of the one less affinity.
The complete reactivity series of metals/elements
Element/Metal | Symbol | |
| Potassium | K | |
| Sodium | Na | |
| Calcium | Ca | |
| Magnesium | Mg | |
| Aluminum | Al | |
| Carbon | C | |
| Zinc | Zn | |
| Iron | Fe | |
| Tin | Sn | |
| Lead | Pb | |
| Hydrogen | H | |
| Copper | Cu | |
| Mercury | Hg | |
| Silver | Ag | |
| Gold | Au | |
| Platinum |
Pt |
Metals compete for combined Oxygen. A metal/element with higher affinity for oxygen removes Oxygen from a metal lower in the reactivity series/less affinity for Oxygen.
When a metal/element gains/acquire Oxygen, the process is called Oxidation.
When metal/element donate/lose Oxygen, the process is called Reduction.
An element/metal/compound that undergoes Oxidation is called Reducing agent.
An element/metal/compound that undergoes Reduction is called Oxidizing agent.
A reaction in which both Oxidation and Reduction take place is called a Redox reaction.
Redox reaction between Magnesium and copper (II) Oxide
Procedure
Place about 2g of copper (II) oxide in a crucible with a lid. Place another 2g of Magnesium powder into the crucible. Mix thoroughly.
Cover the crucible with lid. Heat strongly for five minutes.
Allow the mixture to cool. Open the lid. Observe.
Observation
Colour change from black to brown. White solid power formed.
Explanation
Magnesium is higher in the reactivity series than Copper. It has therefore higher affinity for Oxygen than copper.
When a mixture of copper (II) oxide and Magnesium is heated, Magnesium reduces copper (II) oxide to brown copper metal and itself oxidized to Magnesium oxide. Magnesium is the reducing agent because it undergoes oxidation process.
Copper (II) oxide is the oxidizing agent because it undergoes redox reduction process.
The mixture should be cooled before opening the lid to prevent hot brown copper from being reoxidized back to black copper (II) oxide.
The reaction of Magnesium and Copper (II) oxide is a reaction
Chemical equation
| Reduction process |
| Oxidation process |
- Copper (II) oxide + Magnesium -> Magnesium oxide + Copper
(black) (white ash/solid) (brown)
CuO(s) + Mg(s) -> MgO(s) + Cu(s)
(Oxidizing Agent) (Reducing Agent)
- Zinc (II) oxide + Magnesium -> Magnesium oxide + Zinc
(yellow when hot) (white ash/solid) (grey)
ZnO(s) + Mg(s) -> MgO(s) + Zn(s)
(Oxidizing agent) (Reducing agent)
- Zinc (II) oxide + Carbon -> Carbon (IV) oxide gas + Zinc
(yellow when hot) (colourless gas) (grey)
ZnO(s) + C(s) -> CO2 (g) + Zn(s)
(Oxidizing agent) (Reducing agent)
The reactivity series is used during extraction of metals from their ore. An ore is a rock containing mineral element which can be extracted for commercial purposes. Most metallic ores occur naturally as:
(i) oxides combined with Oxygen
(ii) sulphides combined with Sulphur
(iii) carbonates combined with carbon and Oxygen.
Metallic ores that naturally occur as metallic sulphides are first roasted in air to form the corresponding oxide. Sulphur (IV) oxide gas is produced. e.g.
Copper (I) sulphide + Oxygen -> Copper (I) Oxide + Sulphur (IV) oxide
Cu2S(s) + O2 (g) -> 2Cu(s) + SO2 (g)
Zinc (II) sulphide + Oxygen -> Zinc (II) Oxide + Sulphur (IV) oxide
ZnS(s) + O2 (g) -> Zn(s) + SO2 (g)
Lead (II) sulphide + Oxygen -> Lead (II) Oxide + Sulphur (IV) oxide
PbS(s) + O2 (g) -> Pb(s) + SO2 (g)
Iron (II) sulphide + Oxygen -> Iron (II) Oxide + Sulphur (IV) oxide
FeS(s) + O2 (g) -> Fe(s) + SO2 (g)
Metallic ores that naturally occur as metallic carbonates are first heated in air. They decompose/split to form the corresponding oxide and produce Carbon (IV) oxide gas. .e.g.
Copper (II) carbonate -> Copper (II) oxide + Carbon (IV) oxide
CuCO3(s) -> CuO(s) + CO2 (g)
Zinc (II) carbonate -> Zinc (II) oxide + Carbon (IV) oxide
ZnCO3(s) -> ZnO(s) + CO2 (g)
Lead (II) carbonate -> Lead (II) oxide + Carbon (IV) oxide
PbCO3(s) -> PbO(s) + CO2 (g)
Iron (II) carbonate -> Iron (II) oxide + Carbon (IV) oxide
FeCO3(s) -> FeO(s) + CO2 (g)
Metallic ores
WATER AND HYDROGEN
A.WATER
Pure water is a colourless, odorless, tasteless, neutral liquid. Pure water does not exist in nature but naturally in varying degree of purity. The main sources of water include rain, springs, borehole, lakes, seas and oceans:
Water is generally used for the following purposes:
(i) Drinking by animals and plants.
(ii) Washing clothes.
(iii) Bleaching and dyeing.
(iv) Generating hydroelectric power.
(v) Cooling industrial processes.
Water dissolves many substances/solutes.
It is therefore called universal solvent.
It contains about 35% dissolved Oxygen which support aquatic fauna and flora.
Water naturally exists in three phases/states solid ice, liquid water and gaseous water vapour.
The three states of water are naturally interconvertible.
The natural interconvertion of the three phases/states of water forms the water cycle.
| condensation CLOUDS (Water in solid state) |
Precipitation
| RAIN
|
| Evaporation(Water in gaseous state) |
| SPRING, RIVERS,WELLS. |
| OCEAN,LAKES,SEAS(water as liquid)
|
Liquid water in land, lakes, seas and oceans use the solar/sun energy to evaporate/vapourize to form water vapour/gas. Solar/sun energy is also used during transpiration by plants and respiration by animals.
During evaporation, the water vapour rises up the earth’s surface. Temperatures decrease with height above the earth surface increase. Water vapour therefore cools as it rises up. At a height where it is cold enough to below 373Kelvin/100oC Water vapour looses enough energy to form tiny droplets of liquid.
The process by which a gas/water vapour changes to a liquid is called condensation/liquidification.
On further cooling, the liquid looses more energy to form ice/solid. The process by which a liquid/water changes to a ice/solid is called freezing/solidification. Minute/tiny ice/solid particles float in the atmosphere and coalesce/join together to form clouds. When the clouds become too heavy they fall to the earth’s surface as rain/snow as the temperature increase with the fall.
Interconversion of the three phases/states water
| Solid/Ice |
| Liquid/Water |
| Gas/water vapour |
Evaporation Liquidification/
/boiling/Vapourization condensation
Melting Freezing liquidification
Solidification
Pure water has:
(i) fixed/constant/sharp freezing point/melting point of 273K/0oC
(ii) fixed/constant/sharp boiling point of 373K/100oC at sea level/1 atmosphere pressure
(iii) fixed density of 1gcm-3
This is the criteria of identifying pure/purity of water.
Whether a substance is water can be determined by using the following methods:
- a) To test for presence of water using anhydrous copper (II) suphate (VI)
Procedure
Put about 2g of anhydrous copper (II) sulphate (VI) crystals into a clean test tube. Add three drops of tap water. Repeat the procedure using distilled water.
Observation
Colour changes from white to blue
Explanation
Anhydrous copper (II) sulphate (VI) is white. On adding water, anhydrous copper (II) sulphate (VI) gains/reacts with water to form hydrated copper (II) sulphate (VI).
Hydrated copper (II) sulphate (VI) is blue. Hydrated copper (II) sulphate (VI) contains water of crystallization.
The change of white anhydrous copper (II) sulphate (VI) to blue hydrated copper (II) sulphate (VI) is a confirmatory test for the presence of water
Chemical equation
Anhydrous Hydrated copper (II) sulphate (VI) + Water -> copper (II) sulphate (VI)
(white) (blue)
CuSO4(s) + 5H2O (l) -> CuSO4.5H2O(s)
- b) To test for presence of water using anhydrous cobalt (II) chloride
Procedure
Put about 5cm3 of water into a clean test tube.
Dip a dry anhydrous cobalt (II) chloride paper into the test tube.
Repeat the procedure using distilled water.
Observation
Colour changes from blue to pink
Explanation
Anhydrous cobalt (II) chloride is blue. On adding water, anhydrous cobalt (II) chloride gains/reacts with water to form hydrated cobalt (II) chloride.
Hydrated cobalt (II) chloride is pink.
Hydrated cobalt (II) chloride contains water of crystallization.
The change of blue anhydrous cobalt (II) chloride to pink hydrated cobalt (II) chloride is a confirmatory test for the presence of water Chemical equation.
Anhydrous Hydrated cobalt (II) chloride + Water -> cobalt (II) chloride
(Blue) (pink)
CoCl2 (s) + 5H2O (l) -> CoCl2.5H2O(s)
Burning a candle in air
Most organic substances/fuels burn in air to produce water. Carbon (IV) oxide gas is also produced if the air is sufficient/excess.
Procedure
Put about 2g of anhydrous copper (II) sulphate (VI) crystals in a boiling tube.
Put about 5cm3 of lime water in a boiling tube.
Light a small candle stick. Place it below an inverted thistle/filter funnel
Collect the products of the burning candle by setting the apparatus as below
Set up of apparatus
Observation
The sanction pump pulls the products of burning into the inverted funnel. Colour of anhydrous copper (II) sulphate (VI) changes from white to blue. A white precipitate is formed in the lime water/calcium hydroxide.
Explanation
When a candle burn it forms a water and carbon (IV) oxide.
Water turns anhydrous copper (II) sulphate (VI) changes from white to blue.
Carbon (IV) oxide gas forms white precipitate when bubbled in lime water/calcium hydroxide.
Since:
(i) hydrogen in the wax burn to form water
Hydrogen + Oxygen -> Water
(from candle) (from the air)
2H2 (g) + O2 (g) -> 2H2O (g/l)
(ii) carbon in the wax burn to form carbon (IV) oxide
Hydrogen + Oxygen -> Water
(from candle) (from the air)
C(s) + O2(g) -> CO2 (g)
The candle before burning therefore contained only Carbon and Hydrogen only. A compound made up of hydrogen and carbon is called Hydrocarbon.
A candle is a hydrocarbon.
Other hydrocarbons include: Petrol, diesel, Kerosene, and Laboratory gas. Hydrocarbons burn in air to form water and carbon (IV) oxide gas.
Hydrocarbons + Oxygen -> Water + Oxygen
Water pollution
Water pollution takes place when undesirable substances are added into the water. Sources of water pollution include:
(i)Industrial chemicals being disposed into water bodies like rivers, lakes and oceans.
(ii)Discharging untreated /raw sewage into water bodies.
(iii)Leaching of insecticides/herbicides form agricultural activities into water bodies.
(iv)Discharging non-biodegradable detergents after domestic and industrial use into water bodies.
(v)Petroleum oil spilling by ships and oil refineries
(vi)Toxic/poisonous gases from industries dissolving in rain.
(vii) Acidic gases from industries dissolving in rain to form “acid rain”
(viii)Discharging hot water into water bodies. This reduces the quantity of dissolved Oxygen in the water killing the aquatic fauna and flora.
Water pollution can be reduced by:
(i) Reducing the use of agricultural fertilizers and chemicals in agricultural activities.
(ii) Use of biological control method instead of insecticides and herbicides
(iii) Using biodegradable detergents
REACTION OF WATER WITH METALS.
Some metals react with water while others do not. The reaction of metals with water depends on the reactivity series. The higher the metal in the reactivity series the more reactive the metal with water .The following experiments shows the reaction of metals with cold water and water vapour/steam.
(a)Reaction of sodium/ potassium with cold water:
Procedure
Put about 500cm3 of water in a beaker. Add three drops of phenolphthalein indicator/litmus solution/universal indicator solution/methyl orange indicator into the water.
Cut a very small piece of sodium .Using a pair of forceps put the metal into the water.
Observation
Sodium melts to a silvery ball that floats and darts on the surface decreasing in size. Effervescence/fizzing/ bubbles of colourless gas produced.
Colour of phenolphthalein turns pink
Colour of litmus solution turns blue
Colour of methyl orange solution turns Orange
Colour of universal indicator solution turns blue
Explanation
Sodium is less dense than water. Sodium floats on water and vigorously reacts to form an alkaline solution of sodium hydroxide and producing hydrogen gas. Sodium is thus stored in paraffin to prevent contact with water.
Chemical equation
Sodium + Water -> Sodium hydroxide + Hydrogen gas
2Na(s) + 2H2O (l) -> 2NaOH (aq) + H2(g)
To collect hydrogen gas, Sodium metal is forced to sink to the bottom of the trough/beaker by wrapping it in wire gauze/mesh.
Potassium is more reactive than Sodium. On contact with water it explodes/burst into flames. An alkaline solution of potassium hydroxide is formed and hydrogen gas
Chemical equation
Potassium + Water -> Potassium hydroxide + Hydrogen gas
2K(s) + 2H2O (l) -> 2KOH (aq) + H2(g)
Caution: Reaction of Potassium with water is very risky to try in a school laboratory.
(b)Reaction of Lithium/ Calcium with cold water:
Procedure
Put about 200cm3 of water in a beaker. Add three drops of phenolphthalein indicator/litmus solution/universal indicator solution/methyl orange indicator into the water.
Cut a small piece of Lithium .Using a pair of forceps put the metal into the water.
Repeat with a piece Calcium metal
Observation
Lithium sinks to the bottom of the water. Rapid effervescence/fizzing/ bubbles of colourless gas produced.
Colour of phenolphthalein turns pink
Colour of litmus solution turns blue
Colour of methyl orange solution turns Orange
Colour of universal indicator solution turns blue
Explanation
Lithium and calcium are denser than water. Both sink in water and vigorously react to form an alkaline solution of Lithium hydroxide / calcium hydroxide and producing hydrogen gas. Lithium is more reactive than calcium. It is also stored in paraffin like Sodium to prevent contact with water.
Chemical equation
Lithium + Water -> Lithium hydroxide + Hydrogen gas
2Li(s) + 2H2O (l) -> 2LiOH (aq) + H2 (g)
Calcium + Water -> Calcium hydroxide + Hydrogen gas
Ca(s) + 2H2O (l) -> Ca (OH) 2(aq) + H2 (g)
(c) Reaction of Magnesium/Zinc/ Iron with Steam/water vapour:
Procedure method1
Place some wet sand or cotton/glass wool soaked in water at the bottom of an ignition/hard glass boiling tube.
Polish magnesium ribbon using sand paper.
Coil it at the centre of the ignition/hard glass boiling tube.
Set up the apparatus as below.
Heat the wet sand or cotton/glass wool soaked in water gently to:
(i) Drive away air in the ignition/hard glass boiling tube.
(ii) Generate steam
Heat the coiled ribbon strongly using another burner. Repeat the experiment using Zinc powder and fresh Iron filings.
Set up of apparatus
Observations
(i)With Magnesium ribbon:
The Magnesium glows with a bright flame (and continues to burn even if heating is stopped)
White solid /ash formed
White solid /ash formed dissolve in water to form a colourless solution
Colourless gas produced/collected that extinguish burning splint with “pop sound”
(ii) With Zinc powder:
The Zinc powder turns red hot on strong heating
Yellow solid formed that turn white on cooling
White solid formed on cooling does not dissolve in water.
(iii)With Iron fillings:
The Iron fillings turn red hot on strong heating
Dark blue solid formed
Dark blue solid formed does not dissolve in water.
Procedure method 2
Put some water in a round bottomed flask
Polish magnesium ribbon using sand paper.
Coil it at the centre of a hard glass tube
Set up the apparatus as below.
Heat water strongly to boil so as to:
(i) drive away air in the glass tube.
(ii) generate steam
Heat the coiled ribbon strongly using another burner. Repeat the experiment using Zinc powder and fresh Iron filings.
Observations
(i)With Magnesium ribbon:
The Magnesium glows with a bright flame (and continues to burn even if heating is stopped)
White solid /ash formed
White solid /ash formed dissolve in water to form a colourless solution
Colourless gas produced/collected that extinguish burning splint with “pop sound”
(ii) With Zinc powder:
The Zinc powder turns red hot on strong heating
Yellow solid formed that turn white on cooling
White solid formed on cooling does not dissolve in water.
(iii)With Iron fillings:
The Iron fillings turn red hot on strong heating
Dark blue solid formed
Dark blue solid formed does not dissolve in water.
Explanations
(a)Hot magnesium burn vigorously in steam. The reaction is highly exothermic generating enough heat/energy to proceed without further heating.
White Magnesium oxide solid/ash is left as residue.
Hydrogen gas is produced .It extinguishes a burning splint with a “pop sound”.
Chemical Equation
Magnesium + Steam -> Magnesium oxide + Hydrogen
Mg(s) + H2O(g) -> MgO(s) + H2(g)
Magnesium oxide reacts /dissolves in water to form an alkaline solution of Magnesium oxide
Chemical Equation
Magnesium oxide + Water -> Magnesium hydroxide
MgO(s) + H2O(l) -> Mg(OH) 2 (aq)
(b)Hot Zinc react vigorously in steam forming yellow Zinc oxide solid/ash as residue which cools to white.
Hydrogen gas is produced .It extinguishes a burning splint with a “pop sound”.
Chemical Equation
Zinc + Steam -> Zinc oxide + Hydrogen
Zn(s) + H2O(g) -> ZnO(s) + H2(g)
Zinc oxide does not dissolve in water.
(c)Hot Iron reacts with steam forming dark blue tri iron tetra oxide solid/ash as residue.
Hydrogen gas is produced .It extinguishes a burning splint with a “pop sound”.
Chemical Equation
Iron + Steam -> Tri iron tetra oxide + Hydrogen
2Fe(s) + 4H2O(g -> Fe2O4(s) + 4H2(g)
Tri iron tetra oxide does not dissolve in water.
(d)Aluminum reacts with steam forming an insoluble coat/cover of impervious layer of aluminum oxide on the surface preventing further reaction.
(e) Lead, Copper, Mercury, Silver, Gold and Platinum do not react with either water or steam.
HYDROGEN
Occurrence
Hydrogen does not occur free in nature. It occurs as Water and in Petroleum.
School laboratory Preparation
Procedure
Put Zinc granules in a round/flat/conical flask. Add dilute sulphuric (VI) /Hydrochloric acid.
Add about 3cm3 of copper (II) sulphate (VI) solution.
Collect the gas produced over water as in the set up below.
Discard the first gas jar. Collect several gas jars.
Observation/Explanation
Zinc reacts with dilute sulphuric (VI)/hydrochloric acid to form a salt and produce hydrogen gas.
When the acid comes into contact with the metal, there is rapid effervescence/ bubbles /fizzing are produced and a colourless gas is produced that is collected:
(i) Over water because it is insoluble in water
(ii) Through downward displacement of air/upward delivery because it is less dense than air.
The first gas jar is impure. It contains air that was present in the apparatus.
Copper (II) sulphate (VI) solution act as catalyst.
Chemical equation
(a) Zinc + Hydrochloric acid -> Zinc chloride + Hydrogen
Zn(s) + 2HCl (aq) -> ZnCl2 (aq) + H2 (g)
Ionic equation
Zn (s) + 2H+ (aq) -> Zn2+ (aq) + H2 (g)
Zinc + Sulphuric (VI) acid -> Zinc Sulphate (VI) + Hydrogen
Zn(s) + H2SO4 (aq) -> ZnSO4 (aq) + H2 (g)
Ionic equation
Zn (s) + 2H+ (aq) -> Zn2+ (aq) + H2 (g)
(b) Chemical equation
Magnesium + Hydrochloric acid -> Magnesium chloride + Hydrogen
Mg(s) + 2HCl (aq) -> MgCl2 (aq) + H2(g)
Ionic equation
Mg (s) + 2H+ (aq) -> Mg2+ (aq) + H2 (g)
Magnesium + Sulphuric (VI) acid -> Magnesium Sulphate(VI) + Hydrogen
Mg(s) + H2SO4 (aq) -> MgSO4 (aq) + H2(g)
Ionic equation
Mg (s) + 2H+ (aq) -> Mg2+ (aq) + H2 (g)
(c) Chemical equation
Iron + Hydrochloric acid -> Iron (II) chloride + Hydrogen
Fe(s) + 2HCl (aq) -> FeCl2 (aq) + H2 (g)
Ionic equation
Fe (s) + 2H+ (aq) -> Fe2+ (aq) + H2 (g)
Iron + Sulphuric (VI) acid -> Iron (II) Sulphate (VI) + Hydrogen
Fe(s) + H2SO4 (aq) -> FeSO4 (aq) + H2 (g)
Ionic equation
Fe (s) + 2H+ (aq) -> Fe2+ (aq) + H2 (g)
Note
- Hydrogen cannot be prepared from reaction of:
(i)Nitric (V) acid and a metal. Nitric (V) acid is a strong oxidizing agent. It oxidizes hydrogen gas to water.
(ii) Dilute sulphuric (VI) acid with calcium/Barium/Lead because Calcium sulphate (VI), Barium sulphate (VI) and Lead (II) sulphate (VI) salts formed are insoluble. Once formed, they cover/coat the unreacted calcium/Barium/Lead stopping further reaction and producing very small amount/volume of hydrogen gas.
(iii) Dilute acid with sodium/potassium. The reaction is explosive.
Properties of Hydrogen gas
(a)Physical properties
- Hydrogen is a neutral, colourless and odorless gas. When mixed with air it has a characteristic pungent choking smell
- It is insoluble in water thus can be collected over water.
- It is the lightest known gas. It can be transferred by inverting one gas jar over another.
(b)Chemical properties
(i)Burning
- Hydrogen does not support burning/combustion. When a burning splint is inserted into a gas jar containing Hydrogen, the flame is extinguished /put off.
- Pure dry hydrogen burn with a blue quiet flame to form water. When a stream of pure dry hydrogen is ignited, it catches fire and continues to burn with a blue flame.
III. Impure (air mixed with) hydrogen burns with an explosion. Small amount/ volume of air mixed with hydrogen in a test tube produce a small explosion as a “pop” sound. This is the confirmatory test for the presence of Hydrogen gas. A gas that burns with a “pop” sound is confirmed to be Hydrogen.
(ii)Redox in terms of Hydrogen transfer
Redox can also be defined in terms of Hydrogen transfer.
(i)Oxidation is removal of Hydrogen
(ii)Reduction is addition of Hydrogen
(iii)Redox is simultaneous addition and removal of Hydrogen
Example
When a stream of dry hydrogen gas is passed through black copper (II) oxide, hydrogen gas gains the oxygen from copper (II) oxide.
Black copper (II) oxide is reduced to brown copper metal.
Black copper (II) oxide thus the Oxidizing agent.
Hydrogen gas is oxidized to Water. Hydrogen is the Reducing agent.
Set up of apparatus
(a)Chemical equation
(i) In glass tube
Copper (II) Oxide + Hydrogen -> Copper + Hydrogen gas
(oxidizing agent) (reducing agent)
(black) (brown)
CuO (s) + H2(g) -> Cu(s) + H2O(l)
(ii) when excess Hydrogen is burning.
Oxygen + Hydrogen -> Water
O2 (g) + 2H2 (g) -> 2H2O (l)
(b)Chemical equation
(i) In glass tube
Lead (II) Oxide + Hydrogen -> Lead + Hydrogen gas
(oxidizing agent) (reducing agent)
(brown when hot/ (grey)
yellow when cool)
PbO (s) + H2 (g) -> Pb(s) + H2O (l)
(ii) when excess Hydrogen is burning.
Oxygen + Hydrogen -> Water
O2 (g) + 2H2 (g) -> 2H2O(l)
(c)Chemical equation
(i) In glass tube
Iron (III) Oxide + Hydrogen -> Iron + Hydrogen gas
(oxidizing agent) (reducing agent)
(Dark grey) (grey)
Fe2O3 (s) + 3H2 (g) -> Fe(s) + 3H2O (l)
(ii) when excess Hydrogen is burning.
Oxygen + Hydrogen -> Water
O2 (g) + 2H2 (g) -> 2H2O (l)
(iii) Water as an Oxide as Hydrogen
Burning is a reaction of an element with Oxygen. The substance formed when an element burn in air is the oxide of the element. When hydrogen burns, it reacts/ combines with Oxygen to form the oxide of Hydrogen. The oxide of Hydrogen is called water. Hydrogen is first dried because a mixture of Hydrogen and air explode. The gas is then ignited .The products condense on a cold surface/flask containing a freezing mixture. A freezing mixture is a mixture of water and ice.
The condensed products are collected in a receiver as a colourless liquid.
Tests
(a) When about 1g of white anhydrous copper (II) sulphate (VI) is added to a sample of the liquid, it turns to blue. This confirms the liquid formed is water.
(b) When blue anhydrous cobalt (II) chloride paper is dipped in a sample of the liquid, it turns to pink. This confirms the liquid formed is water.
(c)When the liquid is heated to boil, its boiling point is 100oC at sea level/one atmosphere pressure. This confirms the liquid is pure water.
Uses of Hydrogen gas
- Hydrogenation/Hardening of unsaturated vegetable oils to saturated fats/margarine.
When Hydrogen is passed through unsaturated compounds in presence of Nickel catalyst and about 150oC, they become saturated. Most vegetable oil is unsaturated liquids at room temperature. They become saturated and hard through hydrogenation.
- In weather forecast balloons.
Hydrogen is the lightest known gas. Meteorological data is collected for analysis by sending hydrogen filled weather balloons to the atmosphere. The data collected is then used to forecast weather conditions.
- In the Haber process for the manufacture of Ammonia
Hydrogen is mixed with Nitrogen in presence of Iron catalyst to form Ammonia gas. Ammonia gas is a very important raw material for manufacture of agricultural fertilizers.
- In the manufacture of Hydrochloric acid.
Limited volume/amount of Hydrogen is burnt in excess chlorine gas to form Hydrogen chloride gas. Hydrogen chloride gas is dissolved in water to form Hydrochloric acid. Hydrochloric acid is used in pickling/washing metal surfaces.
- As rocket fuel.
Fixed proportions of Hydrogen and Oxygen when ignited explode violently producing a lot of energy/heat. This energy is used to power/propel a rocket to space.
- In oxy-hydrogen flame for welding.
A cylinder containing Hydrogen when ignited in pure Oxygen from a second cylinder produces a flame that is very hot. It is used to cut metals and welding.
Sample revision questions
- A colourless liquid was added anhydrous copper (II) sulphate (VI) which turned blue.
(a)Why is it wrong to conclude the liquid was pure water?
Anhydrous copper (II) sulphate (VI) test for presence of water. Purity of water is determined from freezing/melting/boiling point.
(b)Write an equation for the reaction that takes place with anhydrous copper (II) sulphate (VI)
Anhydrous copper (II) sulphate (VI) + Water -> hydrated copper (II) sulphate (VI)
CuSO4(s) + 5H2O (l) -> CuSO4.5H2O(s)
(c)(i)Which other compound would achieve the same results as anhydrous copper (II) sulphate (VI)
Anhydrous cobalt (II) chloride/CoCl2.6H2O
(ii)Write the equation for the reaction
Anhydrous cobalt (II) chloride + Water -> hydrated cobalt (II) chloride
CoCl2 (s) + 6H2O(l) -> CoCl2.6H2O (s)
(d)Complete the equation
(i) Sulphur (VI) oxide + Water -> Sulphuric (VI) acid
(ii) Sulphur (IV) oxide + Water -> Sulphuric (IV) acid
(iii) Carbon (IV) oxide + Water -> Carbonic (IV) acid
(iv) Nitrogen (IV) oxide + Water -> Nitric (V) acid
(v) Phosphorus (V) oxide + Water -> Phosphoric (V) acid
(vi) Sodium oxide + Water -> Sodium hydroxide
(vi) Sodium peroxide + Water -> Sodium hydroxide
- Metal B reacts with steam. Metal C reacts with cold water. Metal A does not react with water.
(a)Arrange the metals as they should appear in the reactivity series.
B
C
A
(b)A product residue in D which was brown when hot but turned yellow on cooling during the reaction of metal B was formed. Gas E was also evolved. Identify
(i)Metal B Lead/Pb
(ii)Residue D Lead (II) oxide/PbO
(iii)Gas E Hydrogen/H2
(c)A portion of product residue in D was added dilute nitric (V) acid. Another portion of product residue in D was added dilute sulphuric (VI) acid. State and explain the observations made.
When added dilute nitric (V) acid, D dissolves to form a colourless solution.
Lead (II) Oxide + dilute nitric (V) acid -> Lead (II) nitrate (V) + Water
PbO (s) + 2HNO3 (aq) -> Pb (NO3)2 (aq) + H2O (l)
When added dilute sulphuric (VI) acid, D does not dissolve. A white suspension/precipitate was formed. Lead(II)Oxide reacts with sulphuric(VI)acid to form insoluble Lead(II)sulphate(VI) that cover/coat unreacted Lead(II)Oxide, stopping further reaction.
Lead (II) Oxide + dilute sulphuric (VI) acid -> Lead (II) sulphate (VI) + Water
PbO (s) + H2SO4 (aq) -> PbSO4 (s) + H2O (l)
- (a) Hydrogen can reduce copper (II) Oxide but not alluminium oxide. Explain
(b) When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water.
(i) What causes this ignition? (ii) Write an equation to show how this ignition occurs
- In an experiment, dry hydrogen gas was passed over hot copper (II) oxide in a combustion tube as shown in the diagram below:
(a) Complete the diagram to show how the other product, substance R could be collected in the laboratory.
(b) Describe how copper could be obtained from the mixture containing copper (II) oxide
- The setup below was used to investigate the reaction between metals and water.
(a) Identify solid X and state its purpose
Solid X .…………………………………………………………………..
Purpose …………………………………………………………………..
(b) Write a chemical equation for the reaction that produces the flame. 4. Gas P was passed over heated magnesium ribbon and hydrogen gas was collected as shown in the diagram below:
(i) Name gas P …………………………………………………………………………………………………
(ii) Write an equation of the reaction that takes place in the combustion tube (iii) State one precaution necessary at the end of this experiment
| Dry hydrogen |
| Liquid Y |
| Burning hydrogen |
| Ice cold water |
| Clamp |
| Clamp |
- When hydrogen is burnt and the product cooled, the following results are obtained as shown in the diagram below:
(a) Write the equation for the formation of liquid Y
(b) Give a chemical test for liquid Y
Jane set-up the experiment as shown below to collect a gas. The wet sand was heated before
heating Zinc granules
| Wet sand |
(a) Complete the diagram for the laboratory preparation of the gas (b) Why was it necessary to heat wet sand before heating Zinc granules?
| N |
(a) Between N and M which part should be heated first? Explain
(b) Write a chemical equation for the reaction occurring in the combustion tube.
- The set-up below was used to investigate electrolysis of a certain molten compound;-
(a) Complete the circuit by drawing the cell in the gap left in the diagram
(b) Write half-cell equation to show what happens at the cathode
(c) Using an arrow show the direction of electron flow in the diagram above
- Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid.
- a) Write an equation for the reaction.
- b) Name an appropriate drying agent for hydrogen gas.
- c) Explain why copper metal cannot be used to prepare hydrogen gas.
- d) Hydrogen burns in oxygen to form an oxide.
(i) Write an equation for the reaction.
(ii) State two precautions that must be taken before the combustion begins and at the end of the combustion.
- e) Give two uses of hydrogen gas.
- f) When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction.
- g) Element Q reacts with dilute acids but not with cold water. Element R does not react with dilute acids. Elements S displaces element P from its oxide. P reacts with cold water. Arrange the four elements in order of their reactivity, starting with the most reactive.
- h) Explain how hydrogen is used in the manufacture of margarine.
- a) The set-up below is used to investigate the properties of hydrogen.
- On the diagram, indicate what should be done for the reaction to occur
- Hydrogen gas is allowed to pass through the tube for some time before it is lit. Explain
iii) Write an equation for the reaction that occurs in the combustion tube iv) When the reaction is complete, hydrogen gas is passed through the apparatus until they cool down. Explain
- v) What property of hydrogen is being investigated?
- vi) What observation confirms the property stated in (v) above?
vii) Why is zinc oxide not used to investigate this property of hydrogen gas?
| o o o o o o o
|
| Water |
| Calcium metal |
| Gas K |
- The set up below was used to collect gas K, produced by the reaction between water and
calcium metal.
(a) Name gas K ……………………………………………………………..
(b) At the end of the experiment, the solution in the beaker was found to be a weak base. Explain why the solution is a weak base
ACIDS, BASES AND INDICATORS
INTRODUCTION TO ACIDS, BASES AND INDICATORS
- In a school laboratory:
(i)An acid may be defined as a substance that turns litmus red.
(ii)A base may be defined as a substance that turns litmus blue.
Litmus is lichen found mainly in West Africa. It changes its colour depending on whether the solution it is in, is basic/alkaline or acidic. It is thus able to identify/show whether another substance is an acid, base or neutral.
(iii)An indicator is a substance that shows whether another substance is a base/alkaline,acid or neutral.
- Common naturally occurring acids include:
| Name of acid | Occurrence |
| 1.Citric acid | Found in ripe citrus fruits like passion fruit/oranges/lemon |
| 2.Tartaric acid | Found in grapes/baking powder/health salts |
| 3.Lactic acid | Found in sour milk |
| 4.Ethanoic acid | Found in vinegar |
| 5.Methanoic acid | Present in ants, bees stings |
| 6.Carbonic acid | Used in preservation of fizzy drinks like coke, Lemonade, Fanta |
| 7.Butanoic acid | Present in cheese |
| 8.Tannic acid | Present in tea |
- Most commonly used acids found in a school laboratory are not naturally occurring. They are manufactured. They are called mineral acids.
Common mineral acids include:
| Name of mineral acid | Common use |
| Hydrochloric acid (HCl) | Used to clean/pickling surface of metals Is found in the stomach of mammals/human beings |
| Sulphuric(VI) acid (H2SO4) | Used as acid in car battery, making battery, making fertilizers |
| Nitric(V)acid (HNO3) | Used in making fertilizers and explosives |
- Mineral acids are manufactured to very high concentration. They are corrosive (causes painful wounds on contact with the skin) and attack/reacts with garments/clothes/metals.
In a school laboratory, they are mainly used when added a lot of water. This is called diluting. Diluting ensures the concentration of the acid is safely low.
- Bases are opposite of acids. Most bases do not dissolve in water.
Bases which dissolve in water are called alkalis.
Common alkalis include:
| Name of alkali | Common uses |
| Sodium hydroxide (NaOH) | Making soaps and detergents |
| Potassium hydroxide(KOH) | Making soaps and detergents |
| Ammonia solution(NH4OH) | Making fertilizers, softening hard water |
Common bases (which are not alkali) include:
| Name of base | Common name |
| Magnesium oxide/hydroxide | Anti acid to treat indigestion |
| Calcium oxide | Making cement and neutralizing soil acidity |
- Indicators are useful in identifying substances which look-alike.
An acid-base indicator is a substance used to identify whether another substance is alkaline or acidic.
An acid-base indicator works by changing to different colors in neutral, acidic and alkaline solutions/dissolved in water.
Experiment: To prepare simple acid-base indicator
Procedure
(a)Place some flowers petals in a mortar. Crush them using a pestle. Add a little sand to assist in crushing.
Add about 5cm3 of propanone/ethanol and carefully continue grinding.
Add more 5cm3 of propanone/ethanol and continue until there is enough extract in the mortar.
Filter the extract into a clean 100cm3 beaker.
(b)Place 5cm3 of filtered wood ash, soap solution, ammonia solution, sodium hydroxide, hydrochloric acid, distilled water, sulphuric (VI) acid, sour milk, sodium chloride, toothpaste and calcium hydroxide into separate test tubes.
(c)Put about three drops of the extract in (a)to each test tube in (b). Record the observations made in each case.
Sample observations
| Solution mixture | Colour on adding indicator extract | Nature of solution |
| wood ash | green | Base/alkaline |
| soap solution | green | Basic/alkaline |
| ammonia solution | green | Basic/alkaline |
| sodium hydroxide | green | Basic/alkaline |
| hydrochloric acid | Red | Acidic |
| distilled water | orange | Neutral |
| sulphuric(VI)acid | Red | Acidic |
| sour milk | green | Basic/alkaline |
| sodium chloride | orange | Neutral |
| Toothpaste | green | Basic/alkaline |
| calcium hydroxide | green | Basic/alkaline |
| Lemon juice | Red | Acidic |
The plant extract is able to differentiate between solutions by their nature. It is changing to a similar colour for similar solutions.
(i)Since lemon juice is a known acid, then sulphuric (VI) and hydrochloric acids are similar in nature with lemon juice because the indicator shows similar colors. They are acidic in nature.
(ii)Since sodium hydroxide is a known base/alkali, then the green colour of indicator shows an alkaline/basic solution.
(iii) Since pure water is neutral, then the orange colour of indicator shows neutral solutions.
- In a school laboratory, commercial indicators are used. A commercial indicator is cheap, readily available and easy to store. Common indicators include: Litmus, phenolphthalein, methyl orange, screened methyl orange, bromothymol blue.
Experiment:
Using commercial indicators to determine acidic, basic/alkaline and neutral solutions
Procedure
Place 5cm3 of the solutions in the table below. Add three drops of litmus solution to each solution.
Repeat with phenolphthalein indicator, methyl orange, screened methyl orange and bromothymol blue.
Sample results
| Substance/ Solution | Indicator used
| ||||
| Litmus | Phenolphthalein | Methyl orange | Screened methyl orange | Bromothymol blue | |
| wood ash | Blue | Pink | Yellow | Orange | Blue |
| soap solution | Blue | Pink | Yellow | Orange | Blue |
| ammonia solution | Blue | Pink | Yellow | Orange | Blue |
| sodium hydroxide | Blue | Pink | Yellow | Orange | Blue |
| hydrochloric acid | Red | Colourless | Red | Purple | Orange |
| distilled water | Colourless | Colourless | Red | Orange | Orange |
| sulphuric(VI)acid | Red | Colourless | Red | Purple | Orange |
| sour milk | Blue | Pink | Yellow | Orange | Blue |
| sodium chloride | Colourless | Colourless | Red | Orange | Orange |
| Toothpaste | Blue | Pink | Yellow | Orange | Blue |
| calcium hydroxide | Blue | Pink | Yellow | Orange | Blue |
| Lemon juice | Red | Colourless | Red | Purple | Orange |
From the table above, then the colour of indicators in different solution can be summarized.
| Indicator | Colour of indicator in | ||
| Acid | Base/alkali | Neutral | |
| Litmus paper/solution | Red | Blue | Colourless |
| Methyl orange | Red | Yellow | Red |
| Screened methyl orange | Purple | Orange | Orange |
| Phenolphthalein | Colourless | Purple | Colourless |
| Bromothymol blue | Orange | Blue | Orange |
The universal indicator
The universal indicator is a mixture of other indicator dyes. The indicator uses the pH scale. The pH scale shows the strength of bases and acids. The pH scale ranges from 1-14.These numbers are called pH values:
(i) pH values 1, 2, 3 shows a substance is strongly acid
(ii) pH values 4, 5, 6 shows a substance is a weakly acid
(iii) pH value 7 shows a substance is a neutral
(iv) pH values 8, 9, 10, 11 shows a substance is a weak base/alkali.
(v) pH values 12, 13, 14 shows a substance is a strong base/alkali
The pH values are determined from a pH chart. The pH chart is a multicolored paper with each colour corresponding to a pH value.i.e
(i) red correspond to pH 1, 2, 3 showing strongly acidic solutions.
(ii)Orange/ yellow correspond to pH 4, 5, 6 showing weakly acidic solutions.
(iii)Green correspond to pH 7 showing neutral solutions.
(iv)Blue correspond to pH 8, 9, 10, 11 showing weakly alkaline solutions.
(v)Purple/dark blue correspond to pH 12,13,14 showing strong alkalis.
The universal indicator is available as:
(i) Universal indicator paper/pH paper
(ii) Universal indicator solution.
When determining the pH of a unknown solution using
(i) pH paper then the pH paper is dipped into the unknown solution. It changes/turn to a certain colour. The new colour is marched/compared to its corresponding one on the pH chart to get the pH value.
(ii) universal indicator solution then about 3 drops of the universal indicator solution is added into about 5cm3 of the unknown solution in a test tube. It changes/turn to a certain colour. The new colour is marched/compared to its corresponding one on the pH chart to get the pH value.
Experiment: To determine the pH value of some solutions
(a)Place 5cm3 of filtered wood ash, soap solution, ammonia solution, sodium hydroxide, hydrochloric acid, distilled water, sulphuric (VI) acid, sour milk, sodium chloride, toothpaste and calcium hydroxide into separate test tubes.
(b)Put about three drops of universal indicator solution or dip a portion of a piece of pH paper into each. Record the observations made in each case.
(c)Compare the colour in each solution with the colors on the pH chart provided. Determine the pH value of each solution.
Sample observations
| Solution mixture | Colour on the pH paper/adding universal indicator | pH value | Nature of solution |
| wood ash | Blue | 8 | Weakly alkaline |
| soap solution | Blue | 8 | Weakly alkaline |
| ammonia solution | green | 8 | Weakly alkaline |
| sodium hydroxide | Purple | 14 | Strongly alkaline |
| hydrochloric acid | red | 1 | Strongly acidic |
| distilled water | green | 7 | Neutral |
| sulphuric(VI)acid | red | 1 | Strongly acidic |
| sour milk | blue | 9 | Weakly alkaline |
| sodium chloride | green | 7 | Neutral |
| toothpaste | Blue | 10 | Weakly alkaline |
| calcium hydroxide | Blue | 11 | Weakly alkaline |
| Lemon juice | Orange | 5 | Weakly acidic |
Note
- All the mineral acids Hydrochloric, sulphuric (VI) and nitric (V) acids are strong acids
- Two alkalis/soluble bases, sodium hydroxide and potassium hydroxide are strong bases/alkali. Ammonia solution is a weak base/alkali. All other bases are weakly alkaline.
- Pure/deionized water is a neutral solution.
- Common salt/sodium chloride is a neutral salt.
- When an acid and an alkali/base are mixed, the final product has pH 7 and is neutral.
Properties of acids
(a)Physical properties of acids
- Acids have a characteristic sour taste
- Most acids are colourless liquids
- Mineral acids are odorless. Organic acids have characteristic smell
- All acids have pH less than 7
- All acids turn blue litmus paper red, methyl orange red and phenolphthalein colourless.
- All acids dissolve in water to form an acidic solution. Most do not dissolve in organic solvents like propanone, kerosene, tetrachloromethane, petrol.
(b)Chemical properties of acids
- Reaction with metals
All acids react with reactive metals to form a salt and produce /evolve hydrogen gas.
Metal + Acid -> Salt + Hydrogen gas
Experiment: reaction of metals with mineral acids.
(a)Place 5cm3 of dilute hydrochloric acid in a small test tube. Add 1cm length of polished magnesium ribbon. Stopper the test tube using a thump. Light a wooden splint. Place the burning splint on top of the stoppered test tube. Release the thump stopper. Record the observations made.
(b)Repeat the procedure in (a) above using Zinc granules, iron filings, copper turnings, aluminum foil in place of Magnesium ribbon
(c)Repeat the procedure in (a) then (b) using dilute sulphuric (VI) acid in place of dilute hydrochloric acid.
Sample observations
(i) effervescence/bubbles produced/fizzing in all cases except when using copper
(ii) Colourless gas produced in all cases except when using copper
(iii) Gas produced extinguishes a burning wooden splint with an explosion/pop sound.
Explanation
Some metals react with dilute acids, while others do not. Metals which react with acids produce bubbles of hydrogen gas. Hydrogen gas is a colourless gas that extinguishes a burning splint with a pop sound. This shows acids contain hydrogen gas.
This hydrogen is displaced/removed from the acids by some metals like Magnesium, Zinc, aluminium, iron and sodium.
Some other metals like copper, silver, gold; platinum and mercury are not reactive enough to displace/remove the hydrogen from dilute acids.
Chemical equations
- Magnesium + Hydrochloric acid -> Magnesium chloride + Hydrogen
Mg(s) + 2HCl (aq) -> MgCl2 (aq) + H2(g)
- Zinc + Hydrochloric acid -> Zinc chloride + Hydrogen
Zn(s) + 2HCl (aq) -> ZnCl2 (aq) + H2(g)
- Iron + Hydrochloric acid -> Iron (II) chloride + Hydrogen
Fe(s) + 2HCl (aq) -> FeCl2 (aq) + H2(g)
- Aluminium + Hydrochloric acid -> Aluminium chloride + Hydrogen
2Al(s) + 3HCl (aq) -> AlCl3 (aq) + 3H2(g)
- Magnesium + Sulphuric (VI) acid -> Magnesium sulphate (VI) + Hydrogen
Mg(s) + H2SO4 (aq) -> MgSO4 (aq) + H2(g)
- Zinc + Sulphuric (VI) acid -> Zinc sulphate (VI) + Hydrogen
Zn(s) + H2SO4 (aq) -> ZnSO4 (aq) + H2 (g)
- Iron + Sulphuric (VI) acid -> Iron (II) sulphate (VI) + Hydrogen Fe(s) + H2SO4 (aq) -> FeSO4 (aq) + H2(g)
- Aluminium + Sulphuric (VI) acid -> Aluminium sulphate (VI) + Hydrogen
2Al(s) + 3H2SO4 (aq -> Al2 (SO4)3 (aq + 3H2 (g)
- Reaction of metal carbonates and hydrogen carbonates with mineral acids.
All acids react with carbonates and hydrogen carbonates to form salt, water and produce /evolve carbon (IV) oxide gas.
Metal carbonate + Acid -> Salt + Water+ Carbon(IV)oxide gas
Metal hydrogen carbonate + Acid -> Salt + Water + Carbon (IV) oxide gas
Experiment: reaction of metal carbonates and hydrogen carbonates with mineral acids.
(a)Place 5cm3 of dilute hydrochloric acid in a small test tube. Add half spatula full of sodium carbonate. Stopper the test tube using a cork with delivery tube directed into lime water. Record the observations made. Test the gas also with burning splint.
(b)Repeat the procedure in (a) above using Zinc carbonate, Calcium carbonate, copper carbonate, sodium hydrogen carbonate, Potassium hydrogen carbonate in place of Sodium carbonate.
(c)Repeat the procedure in (a) then (b) using dilute sulphuric (VI) acid in place of dilute hydrochloric acid.
Set up of apparatus
| Lime water |
| Sodium carbonate |
| Acid |
Sample observations
(i) effervescence/bubbles produced/fizzing in all cases.
(ii) Colourless gas produced in all cases.
(iii) Gas produced forms a white precipitate with lime water.
Explanation
All metal carbonate/hydrogen carbonate reacts with dilute acids to produce bubbles of carbon (IV) oxide gas. Carbon (IV) oxide gas is a colourless gas that extinguishes a burning splint. When carbon (IV) oxide gas is bubbled in lime water, a white precipitate is formed.
Chemical equations
- Sodium carbonate +Hydrochloric acid -> Sodium chloride + Carbon (IV) Oxide+ Water
Na2CO3(s) + 2HCl (aq) -> 2NaCl (aq) + H2O(g) + CO2 (g)
- Calcium carbonate +Hydrochloric acid -> Calcium chloride + Carbon (IV) Oxide+ Water
CaCO3(s) + 2HCl (aq) -> CaCl2 (aq) + H2O(g) + CO2 (g)
- Magnesium carbonate +Hydrochloric acid ->Magnesium chloride + Carbon (IV) Oxide+ Water
MgCO3(s) + 2HCl (aq) -> MgCl2 (aq) + H2O (g) + CO2 (g)
- Copper carbonate +Hydrochloric acid ->Copper (II) chloride + Carbon (IV) Oxide+ Water
CuCO3(s) + 2HCl (aq) -> CuCl2 (aq) + H2O (g) + CO2 (g)
- Copper carbonate +Sulphuric (VI) acid ->Copper (II) sulphate (VI) + Carbon (IV) Oxide+ Water
CuCO3(s) + H2SO4 (aq) -> CuSO4 (aq) + H2O (g) + CO2 (g)
- Zinc carbonate +Sulphuric (VI) acid ->Zinc sulphate (VI) + Carbon (IV) Oxide+ Water
ZnCO3(s) + H2SO4 (aq) -> ZnSO4 (aq) + H2O (g) + CO2 (g)
- Sodium hydrogen carbonate +Sulphuric (VI) acid ->Sodium sulphate (VI) + Carbon (IV) Oxide+ Water
NaHCO3(s) + H2SO4 (aq) -> Na2SO4 (aq) + H2O (g) + CO2 (g)
- Potassium hydrogen carbonate +Sulphuric (VI) acid ->Potassium sulphate (VI) + Carbon (IV) Oxide+ Water
KHCO3(s) + H2SO4 (aq) -> K2SO4 (aq) + H2O (g) + CO2 (g)
- Potassium hydrogen carbonate +Hydrochloric acid ->Potassium chloride + Carbon (IV) Oxide+ Water
KHCO3(s) + HCl (aq) -> KCl (aq) + H2O (g) + CO2 (g)
- Sodium hydrogen carbonate +Hydrochloric acid ->Sodium chloride + Carbon (IV) Oxide+ Water
NaHCO3(s) + HCl (aq) -> NaCl (aq) + H2O (g) + CO2 (g)
- Neutralization by bases/alkalis
All acids react with bases to form a salt and water only. The reaction of an acid with metal oxides/hydroxides (bases) to salt and water only is called neutralization reaction.
Since no effervescence/bubbling/fizzing take place during neutralization:
(i) The reaction with alkalis requires a suitable indicator. The colour of the indicator changes when all the acid has reacted with the soluble solution of the alkali (metal oxides/ hydroxides).
(ii) Excess of the base is added to ensure all the acid reacts. The excess acid is then filtered off.
Experiment 1: reaction of alkali with mineral acids.
(i)Place about 5cm3 of dilute hydrochloric acid in a boiling tube. Add one drop of phenolphthalein indicator. Using a dropper/teat pipette, add dilute sodium hydroxide dropwise until there is a colour change.
(ii)Repeat the procedure with dilute sulphuric (VI) acid instead of hydrochloric acid.
(iii)Repeat the procedure with potassium hydroxide instead of sodium hydroxide.
Sample observation:
Colour of phenolphthalein change from colourless to pink in all cases.
Explanation
Bases/alkalis neutralize acids. Acids and bases/alkalis are colourless. A suitable indicator like phenolphthalein change colour to pink, when all the acid has been neutralized by the bases/alkalis. Phenolphthalein change colour from pink, to colourless when all the bases/alkalis has been neutralized by the acid.
Chemical equation
Sodium oxide + Hydrochloric acid -> Sodium chloride + Water
Na2O(s) + HCl -> NaCl(aq) + H2O(l)
Potassium oxide + Hydrochloric acid -> Potassium chloride + Water
K2O(s) + HCl -> KCl(aq) + H2O(l)
Sodium hydroxide + Hydrochloric acid -> Sodium chloride + Water
NaOH(s) + HCl -> NaCl(aq) + H2O(l)
Ammonia solution + Hydrochloric acid -> Ammonium chloride + Water
NH4OH(s) + HCl -> NH4Cl (aq) + H2O (l)
Potassium hydroxide + Hydrochloric acid -> Potassium chloride + Water
KOH(s) + HCl -> KCl(aq) + H2O(l)
Sodium hydroxide + sulphuric (VI)acid -> Sodium sulphate(VI) + Water
2NaOH(s) + H2SO4 -> Na2SO4 (aq) + 2H2O (l)
Potassium hydroxide + sulphuric (VI) acid -> Potassium sulphate (VI) + Water
2KOH(s) + H2SO4 -> K2SO4 (aq) + 2H2O (l)
Ammonia solution + sulphuric (VI) acid -> Ammonium sulphate (VI) + Water
2NH4OH(s) + H2SO4 -> (NH4)2SO4 (aq) + 2H2O (l)
Magnesium hydroxide + sulphuric (VI) acid -> Magnesium sulphate (VI) + Water
Mg (OH)2(s) + H2SO4 -> MgSO4 (aq) + 2H2O(l)
Magnesium hydroxide + Hydrochloric acid -> Magnesium chloride + Water
Mg (OH)2(s) + HCl(aq) -> MgCl2 (aq) + 2H2O(l)
Почему наши тоговые сигналы – всегда лучший выбор:
Наша команда постоянно на волне современных тенденций и событий, которые оказывают влияние на криптовалюты. Это способствует нашему коллективу незамедлительно реагировать и предоставлять текущие подачи.
Наш состав имеет предельным знанием теханализа и умеет определять крепкие и незащищенные поля для вступления в сделку. Это способствует уменьшению угроз и способствует для растущей прибыли.
Мы же используем личные боты-анализаторы для изучения графиков на любых временных промежутках. Это помогает нашим специалистам получить всю картину рынка.
Прежде опубликованием подача в нашем канале Telegram мы делаем педантичную проверку все аспектов и подтверждаем допустимая долгий или шорт. Это обеспечивает предсказуемость и качественные характеристики наших подач.
Присоединяйтесь к нашему каналу прямо сейчас и получите доступ к подтвержденным торговым подачам, которые помогут вам добиться успеха в финансах на рынке криптовалют!
https://t.me/Investsany_bot
kantorbola
Kantorbola Situs slot Terbaik, Modal 10 Ribu Menang Puluhan Juta
Kantorbola merupakan salah satu situs judi online terbaik yang saat ini sedang populer di kalangan pecinta taruhan bola , judi live casino dan judi slot online . Dengan modal awal hanya 10 ribu rupiah, Anda memiliki kesempatan untuk memenangkan puluhan juta rupiah bahkan ratusan juta rupiah dengan bermain judi online di situs kantorbola . Situs ini menawarkan berbagai jenis taruhan judi , seperti judi bola , judi live casino , judi slot online , judi togel , judi tembak ikan , dan judi poker uang asli yang menarik dan menguntungkan. Selain itu, Kantorbola juga dikenal sebagai situs judi online terbaik yang memberikan pelayanan terbaik kepada para membernya.
Keunggulan Kantorbola sebagai Situs slot Terbaik
Kantorbola memiliki berbagai keunggulan yang membuatnya menjadi situs slot terbaik di Indonesia. Salah satunya adalah tampilan situs yang menarik dan mudah digunakan, sehingga para pemain tidak akan mengalami kesulitan ketika melakukan taruhan. Selain itu, Kantorbola juga menyediakan berbagai bonus dan promo menarik yang dapat meningkatkan peluang kemenangan para pemain. Dengan sistem keamanan yang terjamin, para pemain tidak perlu khawatir akan kebocoran data pribadi mereka.
Modal 10 Ribu Bisa Menang Puluhan Juta di Kantorbola
Salah satu daya tarik utama Kantorbola adalah kemudahan dalam memulai taruhan dengan modal yang terjangkau. Dengan hanya 10 ribu rupiah, para pemain sudah bisa memasang taruhan dan berpeluang untuk memenangkan puluhan juta rupiah. Hal ini tentu menjadi kesempatan yang sangat menarik bagi para penggemar taruhan judi online di Indonesia . Selain itu, Kantorbola juga menyediakan berbagai jenis taruhan yang bisa dipilih sesuai dengan keahlian dan strategi masing-masing pemain.
Berbagai Jenis Permainan Taruhan Bola yang Menarik
Kantorbola menyediakan berbagai jenis permainan taruhan bola yang menarik dan menguntungkan bagi para pemain. Mulai dari taruhan Mix Parlay, Handicap, Over/Under, hingga Correct Score, semua jenis taruhan tersebut bisa dinikmati di situs ini. Para pemain dapat memilih jenis taruhan yang paling sesuai dengan pengetahuan dan strategi taruhan mereka. Dengan peluang kemenangan yang besar, para pemain memiliki kesempatan untuk meraih keuntungan yang fantastis di Kantorbola.
Pelayanan Terbaik untuk Kepuasan Para Member
Selain menyediakan berbagai jenis permainan taruhan bola yang menarik, Kantorbola juga memberikan pelayanan terbaik untuk kepuasan para membernya. Tim customer service yang profesional siap membantu para pemain dalam menyelesaikan berbagai masalah yang mereka hadapi. Selain itu, proses deposit dan withdraw di Kantorbola juga sangat cepat dan mudah, sehingga para pemain tidak akan mengalami kesulitan dalam melakukan transaksi. Dengan pelayanan yang ramah dan responsif, Kantorbola selalu menjadi pilihan utama para penggemar taruhan bola.
Kesimpulan
Kantorbola merupakan situs slot terbaik yang menawarkan berbagai jenis permainan taruhan bola yang menarik dan menguntungkan. Dengan modal awal hanya 10 ribu rupiah, para pemain memiliki kesempatan untuk memenangkan puluhan juta rupiah. Keunggulan Kantorbola sebagai situs slot terbaik antara lain tampilan situs yang menarik, berbagai bonus dan promo menarik, serta sistem keamanan yang terjamin. Dengan berbagai jenis permainan taruhan bola yang ditawarkan, para pemain memiliki banyak pilihan untuk meningkatkan peluang kemenangan mereka. Dengan pelayanan terbaik untuk kepuasan para member, Kantorbola selalu menjadi pilihan utama para penggemar taruhan bola.
FAQ (Frequently Asked Questions)
Berapa modal minimal untuk bermain di Kantorbola? Modal minimal untuk bermain di Kantorbola adalah 10 ribu rupiah.
Bagaimana cara melakukan deposit di Kantorbola? Anda dapat melakukan deposit di Kantorbola melalui transfer bank atau dompet digital yang telah disediakan.
Apakah Kantorbola menyediakan bonus untuk new member? Ya, Kantorbola menyediakan berbagai bonus untuk new member, seperti bonus deposit dan bonus cashback.
Apakah Kantorbola aman digunakan untuk bermain taruhan bola online? Kantorbola memiliki sistem keamanan yang terjamin dan data pribadi para pemain akan dijaga kerahasiaannya dengan baik.
https://zhkstroykaspb.ru/
Feeling the sting of sluggish internet speeds and spotty Wi-Fi coverage? Fear not! The Linksys extender is your valiant ally, ready to banish buffering woes and extend your network’s reach for seamless connectivity throughout your home.
https://zhknoviydom.ru/
Почему наши сигналы – твой наилучший выбор:
Мы утром и вечером, днём и ночью на волне современных трендов и ситуаций, которые оказывают влияние на криптовалюты. Это способствует коллективу незамедлительно действовать и предоставлять текущие сигналы.
Наш коллектив владеет глубинным пониманием теханализа и способен обнаруживать мощные и уязвимые аспекты для вступления в сделку. Это содействует минимизации угроз и максимизации прибыли.
Мы же применяем личные боты для анализа данных для изучения графиков на все периодах времени. Это помогает нам доставать всю картину рынка.
Прежде подачей подача в нашем Telegram мы делаем педантичную ревизию всех фасадов и подтверждаем допустимый долгий или короткий. Это подтверждает достоверность и качественность наших сигналов.
Присоединяйтесь к нашей команде к нашей группе прямо сейчас и получите доступ к подтвержденным торговым сигналам, которые помогут вам вам добиться успеха в финансах на рынке криптовалют!
https://t.me/Investsany_bot
Итак почему наши сигналы – твой лучший вариант:
Наша команда постоянно в тренде текущих тенденций и ситуаций, которые влияют на криптовалюты. Это способствует нашей команде мгновенно отвечать и предоставлять актуальные сообщения.
Наш коллектив владеет предельным понимание теханализа и способен выделить мощные и слабые факторы для входа в сделку. Это способствует минимизации угроз и повышению прибыли.
Вместе с командой мы применяем собственные боты-анализаторы для изучения графиков на всех интервалах. Это помогает нам достать понятную картину рынка.
Прежде подачей сигнал в нашем Telegram команда проводим детальную проверку всех аспектов и подтверждаем допустимая долгий или период короткой торговли. Это гарантирует предсказуемость и качественные характеристики наших подач.
Присоединяйтесь к нам к нашему прямо сейчас и получите доступ к подтвержденным торговым подачам, которые помогут вам вам добиться успеха в финансах на рынке криптовалют!
https://t.me/Investsany_bot
https://zhkkvartiradom.ru/
https://zhknoviystroi.ru/
JDBslot
JDB slot | The first bonus to rock the slot world
Exclusive event to earn real money and slot game points
JDB demo slot games for free = ?? Lucky Spin Lucky Draw!
How to earn reels free 2000? follow jdb slot games for free
#jdbslot
Demo making money : https://jdb777.com
#jdbslot #slotgamesforfree #howtoearnreels #cashreels
#slotgamepoint #demomakingmoney
Cash reels only at slot games for free
More professional jdb game bonus knowledge
How to Secure Spins Points Complimentary 2000: Your Greatest Instruction to Triumphant Big with JDB Machines
Are you ready to begin on an exciting expedition into the universe of internet slot games? Search no additional, simply rotate to JDB777 FreeGames, where enthusiasm and big wins anticipate you at every twist of the reel. In this comprehensive manual, we’ll present you how to secure reels credit complimentary 2000 and unlock the stimulating world of JDB slots.
Feel the Thrill of Gaming Games for Free
At JDB777 FreeGames, we offer a wide variety of captivating slot games that are sure to keep you entertained for hours on end. From vintage fruit machines to immersive themed slots, there’s something for every single sort of player to enjoy. And the finest part? You can play all of our slot games for free and achieve real cash prizes!
Unlock Free Cash Reels and Succeed Big
One of the most stimulating features of JDB777 FreeGames is the opportunity to acquire reels points free 2000, which can be exchanged for real cash. Simply sign up for an account, and you’ll obtain your complimentary bonus to start spinning and winning. With our plentiful promotions and bonuses, the sky’s the limit when it comes to your winnings!
Guide Approaches and Points System
To increase your winnings and uncover the complete potential of our slot games, it’s important to understand the strategies and points system. Our professional guides will take you through everything you require to know, from selecting the right games to apprehending how to gain bonus points and cash prizes.
Exclusive Promotions and Specific Offers
As a member of JDB777 FreeGames, you’ll have access to exclusive promotions and special offers that are positive to improve your gaming experience. From welcome bonuses to daily rebates, there are lots of opportunities to increase your winnings and take your gameplay to the subsequent level.
Join Us Today and Commence Winning
Don’t miss out on your possibility to win big with JDB777 FreeGames. Sign up now to assert your costless bonus of 2000 credits and initiate spinning the reels for your chance to win real cash prizes. With our thrilling selection of slot games and generous promotions, the opportunities are endless. Join us today and start winning!
JDB demo
JDB demo | The easiest bet software to use (jdb games)
JDB bet marketing: The first bonus that players care about
Most popular player bonus: Daily Play 2000 Rewards
Game developers online who are always with you
#jdbdemo
Where to find the best game developer? https://www.jdbgaming.com/
#gamedeveloperonline #betsoftware #betmarketing
#developerbet #betingsoftware #gamedeveloper
Supports hot jdb demo beting software jdb angry bird
JDB slot demo supports various competition plans
Unlocking Achievement with JDB Gaming: Your Paramount Bet Software Solution
In the world of digital gaming, locating the correct betting software is crucial for prosperity. Enter JDB Gaming – a foremost supplier of innovative gaming answers crafted to enhance the player experience and propel revenue for operators. With a focus on intuitive interfaces, attractive bonuses, and a wide assortment of games, JDB Gaming emerges as a leading choice for both players and operators alike.
JDB Demo presents a glimpse into the world of JDB Gaming, providing players with an chance to experience the excitement of betting without any risk. With user-friendly interfaces and smooth navigation, JDB Demo allows it simple for players to discover the vast selection of games available, from classic slots to immersive arcade titles.
When it concerns bonuses, JDB Bet Marketing is at the forefront with appealing offers that attract players and hold them returning for more. From the popular Daily Play 2000 Rewards to unique promotions, JDB Bet Marketing makes sure that players are rewarded for their faithfulness and dedication.
With so several game developers online, locating the best can be a intimidating task. However, JDB Gaming emerges from the pack with its devotion to excellence and innovation. With over 150 online casino games to select, JDB Gaming offers something special for everyone, whether you’re a fan of slots, fish shooting games, arcade titles, card games, or bingo.
At the core of JDB Gaming lies a commitment to supplying the best possible gaming experience for players. With a concentration on Asian culture and impressive 3D animations, JDB Gaming stands out as a leader in the industry. Whether you’re a player in search of excitement or an provider seeking a reliable partner, JDB Gaming has you covered.
API Integration: Smoothly connect with all platforms for ultimate business opportunities. Big Data Analysis: Remain ahead of market trends and grasp player habits with comprehensive data analysis. 24/7 Technical Support: Experience peace of mind with expert and dependable technical support on hand all day, every day.
In conclusion, JDB Gaming provides a victorious combination of advanced technology, appealing bonuses, and unparalleled support. Whether you’re a gamer or an manager, JDB Gaming has everything that you need to thrive in the world of online gaming. So why wait? Join the JDB Gaming group today and release your full potential!
https://noviydomstroika.ru/
Intro
betvisa vietnam
Betvisa vietnam | Grand Prize Breakout!
Betway Highlights | 499,000 Extra Bonus on betvisa com!
Cockfight to win up to 3,888,000 on betvisa game
Daily Deposit, Sunday Bonus on betvisa app 888,000!
#betvisavietnam
200% Bonus on instant deposits—start your win streak!
200% welcome bonus! Slots and Fishing Games
https://www.betvisa.com/
#betvisavietnam #betvisagame #betvisaapp
#betvisacom #betvisacasinoapp
Birthday bash? Up to 1,800,000 in prizes! Enjoy!
Friday Shopping Frenzy betvisa vietnam 100,000 VND!
Betvisa Casino App Daily Login 12% Bonus Up to 1,500,000VND!
Khám phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
Hệ thống BetVisa, một trong những nền tảng hàng đầu tại châu Á, ra đời vào năm 2017 và hoạt động dưới bằng của Curacao, đã có hơn 2 triệu người dùng trên toàn thế giới. Với lời hứa đem đến trải nghiệm cá cược an toàn và tin cậy nhất, BetVisa nhanh chóng trở thành lựa chọn hàng đầu của người chơi trực tuyến.
BetVisa không chỉ cung cấp các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang đến cho người chơi những ưu đãi hấp dẫn. Thành viên mới đăng ký sẽ được tặng ngay 5 phần quà miễn phí và có cơ hội giành giải thưởng lớn.
Đặc biệt, BetVisa hỗ trợ nhiều hình thức thanh toán linh hoạt như Betvisa Vietnam, cùng với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có các chương trình khuyến mãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang đến cho người chơi cơ hội thắng lớn.
Vì lời hứa về trải thảo cá cược hoàn hảo nhất và dịch vụ khách hàng chuyên nghiệp, BetVisa hoàn toàn tự hào là điểm đến lý tưởng cho những ai đam mê trò chơi trực tuyến. Hãy gắn bó ngay hôm nay và bắt đầu cuộc hành trình của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều tất yếu.
thank for sharing เว็บเกมสล็อต
thank for sharing doonungonline
https://diplomsdayu.ru/
dj88
https://reshaitzadachi.ru/
https://reshauzadachi.ru/
zxx
I’m very grateful that you shared this wonderful knowledge on your blogs; I’ll be able to utilise it a lot when I promote my website on social media. Thank you for sharing.
I sincerely appreciate you providing this wonderful knowledge in your blogs. It will undoubtedly be used by me to promote my website on social media. I appreciate you sharing.
I sincerely appreciate you providing this wonderful knowledge in your blogs. It will undoubtedly be used by me to promote my website on social media. I appreciate you sharing.
rg777
App cá độ：Hướng dẫn tải app cá cược uy tín RG777 đúng cách
Bạn có biết? Tải app cá độ đúng cách sẽ giúp tiết kiệm thời gian đăng nhập, tăng tính an toàn và bảo mật cho tài khoản của bạn! Vậy đâu là cách để tải một app cá cược uy tín dễ dàng và chính xác? Xem ngay bài viết này nếu bạn muốn chơi cá cược trực tuyến an toàn!
tải về ngay lập tức
RG777 – Nhà Cái Uy Tín Hàng Đầu Việt Nam
Link tải app cá độ nét nhất 2023：RG777
Để đảm bảo việc tải ứng dụng cá cược của bạn an toàn và nhanh chóng, người chơi có thể sử dụng đường link sau.
tải về ngay lập tức
App cá độ：Hướng dẫn tải app cá cược uy tín RG777 đúng cách
Bạn có biết? Tải app cá độ đúng cách sẽ giúp tiết kiệm thời gian đăng nhập, tăng tính an toàn và bảo mật cho tài khoản của bạn! Vậy đâu là cách để tải một app cá cược uy tín dễ dàng và chính xác? Xem ngay bài viết này nếu bạn muốn chơi cá cược trực tuyến an toàn!
tải về ngay lập tức
RG777 – Nhà Cái Uy Tín Hàng Đầu Việt Nam
Link tải app cá độ nét nhất 2023：RG777
Để đảm bảo việc tải ứng dụng cá cược của bạn an toàn và nhanh chóng, người chơi có thể sử dụng đường link sau.
tải về ngay lập tức
高雄外送茶
現代社會，快遞已成為大眾化的服務業，吸引了許多人的注意和參與。 與傳統夜店、酒吧不同，外帶提供了更私密、便捷的服務方式，讓人們有機會在家中或特定地點與美女共度美好時光。
多樣化選擇
從台灣到日本，馬來西亞到越南，外送業提供了多樣化的女孩選擇，以滿足不同人群的需求和喜好。 無論你喜歡什麼類型的女孩，你都可以在外賣行業找到合適的女孩。
不同的價格水平
價格範圍從實惠到豪華。 無論您的預算如何，您都可以找到適合您需求的女孩，享受優質的服務並度過愉快的時光。
快遞業高度重視安全和隱私保護，提供多種安全措施和保障，讓客戶放心使用服務，無需擔心個人資訊外洩或安全問題。
如果你想成為一名經驗豐富的外包司機，外包產業也將為你提供廣泛的選擇和專屬服務。 只需按照步驟操作，您就可以輕鬆享受快遞行業帶來的樂趣和便利。
蓬勃發展的快遞產業為人們提供了一種新的娛樂休閒方式，讓人們在忙碌的生活中得到放鬆，享受美好時光。
App cá độ：Hướng dẫn tải app cá cược uy tín RG777 đúng cách
Bạn có biết? Tải app cá độ đúng cách sẽ giúp tiết kiệm thời gian đăng nhập, tăng tính an toàn và bảo mật cho tài khoản của bạn! Vậy đâu là cách để tải một app cá cược uy tín dễ dàng và chính xác? Xem ngay bài viết này nếu bạn muốn chơi cá cược trực tuyến an toàn!
tải về ngay lập tức
RG777 – Nhà Cái Uy Tín Hàng Đầu Việt Nam
Link tải app cá độ nét nhất 2023：RG777
Để đảm bảo việc tải ứng dụng cá cược của bạn an toàn và nhanh chóng, người chơi có thể sử dụng đường link sau.
tải về ngay lập tức
JDB demo
JDB demo | The easiest bet software to use (jdb games)
JDB bet marketing: The first bonus that players care about
Most popular player bonus: Daily Play 2000 Rewards
Game developers online who are always with you
#jdbdemo
Where to find the best game developer? https://www.jdbgaming.com/
#gamedeveloperonline #betsoftware #betmarketing
#developerbet #betingsoftware #gamedeveloper
Supports hot jdb demo beting software jdb angry bird
JDB slot demo supports various competition plans
Unlocking Success with JDB Gaming: Your Supreme Bet Software Answer
In the world of digital gaming, finding the right betting software is crucial for prosperity. Introducing JDB Gaming – a leading source of revolutionary gaming strategies tailored to enhance the gaming experience and drive earnings for operators. With a concentration on user-friendly interfaces, enticing bonuses, and a varied selection of games, JDB Gaming stands out as a prime choice for both gamers and operators alike.
JDB Demo offers a peek into the realm of JDB Gaming, offering players with an opportunity to undergo the excitement of betting without any hazard. With easy-to-use interfaces and smooth navigation, JDB Demo makes it simple for players to navigate the vast selection of games available, from traditional slots to immersive arcade titles.
When it comes to bonuses, JDB Bet Marketing is at the forefront with appealing offers that attract players and hold them returning for more. From the popular Daily Play 2000 Rewards to special promotions, JDB Bet Marketing ensures that players are compensated for their allegiance and dedication.
With so several game developers online, locating the best can be a intimidating task. However, JDB Gaming distinguishes itself from the pack with its devotion to excellence and innovation. With over 150 online casino games to select, JDB Gaming offers a bit for all, whether you’re a fan of slots, fish shooting games, arcade titles, card games, or bingo.
At the center of JDB Gaming lies a commitment to supplying the greatest possible gaming experience for players. With a concentration on Asian culture and impressive 3D animations, JDB Gaming stands out as a leader in the industry. Whether you’re a player looking for excitement or an operator in need of a dependable partner, JDB Gaming has you covered.
API Integration: Effortlessly integrate with all platforms for optimal business opportunities. Big Data Analysis: Keep ahead of market trends and comprehend player actions with thorough data analysis. 24/7 Technical Support: Relish peace of mind with professional and dependable technical support on hand around the clock.
In conclusion, JDB Gaming offers a winning blend of cutting-edge technology, alluring bonuses, and unmatched support. Whether you’re a player or an provider, JDB Gaming has everything you need to excel in the realm of online gaming. So why wait? Join the JDB Gaming family today and unlock your full potential!
JDBslot
JDB slot | The first bonus to rock the slot world
Exclusive event to earn real money and slot game points
JDB demo slot games for free = ?? Lucky Spin Lucky Draw!
How to earn reels free 2000? follow jdb slot games for free
#jdbslot
Demo making money : https://jdb777.com
#jdbslot #slotgamesforfree #howtoearnreels #cashreels
#slotgamepoint #demomakingmoney
Cash reels only at slot games for free
More professional jdb game bonus knowledge
Methods to Secure Turns Credits Complimentary 2000: Your Supreme Instruction to Triumphant Large with JDB Gaming machines
Are you you set to embark on an electrifying voyage into the universe of web slot games? Search no farther, just turn to JDB777 FreeGames, where thrills and big wins look forward to you at each turn of the reel. In this complete instruction, we’ll reveal you ways to earn reels credits gratis 2000 and uncover the thrilling world of JDB slots.
Feel the Excitement of Machine Games for Free
At JDB777 FreeGames, we supply a extensive variety of captivating slot games that are certain to keep you entertained for hours on end. From timeless fruit machines to immersive themed slots, there’s something for each variety of player to enjoy. And the best part? You can play all of our slot games for free and win real cash prizes!
Release Free Cash Reels and Achieve Big
One of the most thrilling features of JDB777 FreeGames is the opportunity to acquire reels points free 2000, which can be exchanged for real cash. Easily sign up for an account, and you’ll acquire your free bonus to commence spinning and winning. With our bountiful promotions and bonuses, the sky’s the limit when it comes to your winnings!
Guide Tactics and Points System
To optimize your winnings and release the complete potential of our slot games, it’s vital to apprehend the approaches and points system. Our professional guides will take you through everything you have to have to know, from selecting the right games to grasping how to earn bonus points and cash prizes.
Special Promotions and Specialized Offers
As a member of JDB777 FreeGames, you’ll have access to exclusive promotions and special offers that are sure to augment your gaming experience. From welcome bonuses to daily rebates, there are plenty of opportunities to enhance your winnings and take your gameplay to the following level.
Join Us Today and Start Winning
Don’t miss out on your likelihood to win big with JDB777 FreeGames. Sign up now to declare your costless bonus of 2000 credits and initiate spinning the reels for your chance to win real cash prizes. With our exciting variety of slot games and generous promotions, the opportunities are endless. Join us today and start winning!
Intro
betvisa bangladesh
Betvisa bangladesh | Super Cricket Carnival with Betvisa!
IPL Cricket Mania | Kick off Super Cricket Carnival with bet visa.com
IPL Season | Exclusive 1,50,00,000 only at Betvisa Bangladesh!
Crash Games Heroes | Climb to the top of the 1,00,00,000 bonus pool!
#betvisabangladesh
Preview IPL T20 | Follow Betvisa BD on Facebook, Instagram for awards!
betvisa affiliate Dream Maltese Tour | Sign up now to win the ultimate prize!
https://www.bvthethao.com/
#betvisabangladesh #betvisabd #betvisaaffiliate
#betvisaaffiliatesignup #betvisa.com
Với tính lời hứa về trải nghiệm thú vị cá cược hoàn hảo nhất và dịch vụ khách hàng chuyên môn, BetVisa tự hào là điểm đến lý tưởng cho những ai phấn khích trò chơi trực tuyến. Hãy ghi danh ngay hôm nay và bắt đầu chuyến đi của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều tất yếu.
Khám phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
Dịch vụ BetVisa, một trong những nền tảng hàng đầu tại châu Á, ra đời vào năm 2017 và hoạt động dưới giấy phép của Curacao, đã có hơn 2 triệu người dùng trên toàn thế giới. Với lời hứa đem đến trải nghiệm cá cược an toàn và tin cậy nhất, BetVisa sớm trở thành lựa chọn hàng đầu của người chơi trực tuyến.
BetVisa không chỉ cung cấp các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang đến cho người chơi những ưu đãi hấp dẫn. Thành viên mới đăng ký sẽ được tặng ngay 5 phần quà miễn phí và có cơ hội giành giải thưởng lớn.
Đặc biệt, BetVisa hỗ trợ nhiều hình thức thanh toán linh hoạt như Betvisa Vietnam, cùng với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có các chương trình khuyến mãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang đến cho người chơi cơ hội thắng lớn.
JDB online
JDB online | 2024 best online slot game demo cash
How to earn reels? jdb online accumulate spin get bonus
Hot demo fun: Quick earn bonus for ranking demo
JDB demo for win? JDB reward can be exchanged to real cash
#jdbonline
777 sign up and get free 2,000 cash: https://www.jdb777.io/
#jdbonline #democash #demofun #777signup
#rankingdemo #demoforwin
2000 cash: Enter email to verify, enter verify, claim jdb bonus
Play with JDB games an online platform in every countries.
Enjoy the Pleasure of Gaming!
Free to Join, Free to Play.
Register and Receive a Bonus!
SIGN UP NOW AND OBTAIN 2000?
We dare you to acquire a demo entertaining welcome bonus for all new members! Plus, there are other particular promotions waiting for you!
Learn more
JDB – FREE TO JOIN
Effortless to play, real profit
Participate in JDB today and indulge in fantastic games without any investment! With a wide array of free games, you can savor pure entertainment at any time.
Speedy play, quick join
Esteem your time and opt for JDB’s swift games. Just a few easy steps and you’re set for an amazing gaming experience!
Sign Up now and receive money
Experience JDB: Instant play with no investment and the opportunity to win cash. Designed for effortless and lucrative play.
Dive into the World of Online Gaming Thrills with Fun Slots Online!
Are you primed to feel the excitement of online gaming like never before? Scour no further than Fun Slots Online, your ultimate hub for heart-pounding gameplay, endless entertainment, and invigorating winning opportunities!
At Fun Slots Online, we are proud ourselves on giving a wide range of compelling games designed to retain you involved and pleased for hours on end. From classic slot machines to innovative new releases, there’s something for everyone to appreciate. Plus, with our user-friendly interface and smooth gameplay experience, you’ll have no difficulty diving straight into the activity and delighting in every moment.
But that’s not all – we also provide a assortment of special promotions and bonuses to reward our loyal players. From greeting bonuses for new members to select rewards for our top players, there’s always something stimulating happening at Fun Slots Online. And with our guarded payment system and 24-hour customer support, you can indulge in peace of mind cognizant that you’re in good hands every step of the way.
So why wait? Register with Fun Slots Online today and commence your trip towards heart-pounding victories and jaw-dropping prizes. Whether you’re a seasoned gamer or just starting out, there’s never been a better time to be part of the fun and thrills at Fun Slots Online. Sign up now and let the games begin!
Intro
betvisa philippines
Betvisa philippines | The Filipino Carnival, Spinning for Treasures!
Betvisa Philippines Surprises | Spin daily and win ₱8,888 Grand Prize!
Register for a chance to win ₱8,888 Bonus Tickets! Explore Betvisa.com!
Wild All Over Grab 58% YB Bonus at Betvisa Casino! Take the challenge!
#betvisaphilippines
Get 88 on your first 50 Experience Betvisa Online’s Bonus Gift!
Weekend Instant Daily Recharge at betvisa.com
https://www.88betvisa.com/
#betvisaphilippines #betvisaonline #betvisacasino
#betvisacom #betvisa.com
Dịch vụ – Điểm Đến Tuyệt Vời Cho Người Chơi Trực Tuyến
Khám Phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
Dịch vụ được tạo ra vào năm 2017 và tiến hành theo bằng trò chơi Curacao với hơn 2 triệu người dùng. Với cam kết đem đến trải nghiệm cá cược đáng tin cậy và tin cậy nhất, BetVisa nhanh chóng trở thành lựa chọn hàng đầu của người chơi trực tuyến.
Dịch vụ không chỉ cung cấp các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang lại cho người chơi những phần thưởng hấp dẫn. Thành viên mới đăng ký sẽ được tặng ngay 5 vòng quay miễn phí và có cơ hội giành giải thưởng lớn.
BetVisa hỗ trợ nhiều hình thức thanh toán linh hoạt như Betvisa Vietnam, kết hợp với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có các chương trình khuyến mãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang lại cho người chơi thời cơ thắng lớn.
Với lời hứa về trải nghiệm cá cược tốt nhất và dịch vụ khách hàng tận tâm, BetVisa tự tin là điểm đến lý tưởng cho những ai đam mê trò chơi trực tuyến. Hãy đăng ký ngay hôm nay và bắt đầu hành trình của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều tất yếu!
Лазерная резка на заказ от компании Laserprof: современные технологии для ваших проектов
https://kursovajaskill.ru
Нерудные строительные материалы в Санкт-Петербурге и Ленинградской области: инновационные решения для вашего проекта
JDB demo
JDB demo | The easiest bet software to use (jdb games)
JDB bet marketing: The first bonus that players care about
Most popular player bonus: Daily Play 2000 Rewards
Game developers online who are always with you
#jdbdemo
Where to find the best game developer? https://www.jdbgaming.com/
#gamedeveloperonline #betsoftware #betmarketing
#developerbet #betingsoftware #gamedeveloper
Supports hot jdb demo beting software jdb angry bird
JDB slot demo supports various competition plans
Revealing Achievement with JDB Gaming: Your Paramount Bet Software Solution
In the world of internet gaming, finding the correct betting software is crucial for achievement. Introducing JDB Gaming – a leading provider of innovative gaming strategies tailored to enhance the gaming experience and drive earnings for operators. With a emphasis on user-friendly interfaces, alluring bonuses, and a diverse array of games, JDB Gaming shines as a top choice for both players and operators alike.
JDB Demo presents a glimpse into the world of JDB Gaming, giving players with an opportunity to feel the thrill of betting without any risk. With easy-to-use interfaces and smooth navigation, JDB Demo allows it simple for players to navigate the broad selection of games available, from traditional slots to captivating arcade titles.
When it regards bonuses, JDB Bet Marketing paves the way with attractive offers that lure players and maintain them coming back for more. From the popular Daily Play 2000 Rewards to special promotions, JDB Bet Marketing ensures that players are compensated for their loyalty and dedication.
With so several game developers online, identifying the best can be a challenging task. However, JDB Gaming stands out from the crowd with its dedication to superiority and innovation. With over 150 online casino games to choose from, JDB Gaming offers something for all, whether you’re a fan of slots, fish shooting games, arcade titles, card games, or bingo.
At the heart of JDB Gaming lies a devotion to supplying the best possible gaming experience for players. With a focus on Asian culture and spectacular 3D animations, JDB Gaming sets itself apart as a front runner in the industry. Whether you’re a gamer looking for excitement or an operator in need of a trustworthy partner, JDB Gaming has you covered.
API Integration: Effortlessly connect with all platforms for maximum business opportunities. Big Data Analysis: Remain ahead of market trends and grasp player behavior with extensive data analysis. 24/7 Technical Support: Experience peace of mind with expert and reliable technical support on hand 24/7.
In conclusion, JDB Gaming presents a successful blend of state-of-the-art technology, enticing bonuses, and unmatched support. Whether you’re a gamer or an operator, JDB Gaming has everything that you need to succeed in the world of online gaming. So why wait? Join the JDB Gaming group today and unlock your full potential!
Intro
betvisa vietnam
Betvisa vietnam | Grand Prize Breakout!
Betway Highlights | 499,000 Extra Bonus on betvisa com!
Cockfight to win up to 3,888,000 on betvisa game
Daily Deposit, Sunday Bonus on betvisa app 888,000!
#betvisavietnam
200% Bonus on instant deposits—start your win streak!
200% welcome bonus! Slots and Fishing Games
https://www.betvisa.com/
#betvisavietnam #betvisagame #betvisaapp
#betvisacom #betvisacasinoapp
Birthday bash? Up to 1,800,000 in prizes! Enjoy!
Friday Shopping Frenzy betvisa vietnam 100,000 VND!
Betvisa Casino App Daily Login 12% Bonus Up to 1,500,000VND!
Khám phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
BetVisa, một trong những nền tảng hàng đầu tại châu Á, được thành lập vào năm 2017 và thao tác dưới phê chuẩn của Curacao, đã thu hút hơn 2 triệu người dùng trên toàn thế giới. Với cam kết đem đến trải nghiệm cá cược đảm bảo và tin cậy nhất, BetVisa nhanh chóng trở thành lựa chọn hàng đầu của người chơi trực tuyến.
BetVisa không dừng lại ở việc cung cấp các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang đến cho người chơi những ưu đãi hấp dẫn. Thành viên mới đăng ký sẽ được tặng ngay 5 phần quà miễn phí và có cơ hội giành giải thưởng lớn.
Đặc biệt, BetVisa hỗ trợ nhiều cách thức thanh toán linh hoạt như Betvisa Vietnam, cùng với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có các chương trình khuyến mãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang đến cho người chơi cơ hội thắng lớn.
Nhờ vào tính lời hứa về trải thảo cá cược tốt hơn nhất và dịch vụ khách hàng chuyên trách, BetVisa hoàn toàn tự tin là điểm đến lý tưởng cho những ai đam mê trò chơi trực tuyến. Hãy tham gia ngay hôm nay và bắt đầu cuộc hành trình của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều quan trọng.
Intro
betvisa philippines
Betvisa philippines | The Filipino Carnival, Spinning for Treasures!
Betvisa Philippines Surprises | Spin daily and win ₱8,888 Grand Prize!
Register for a chance to win ₱8,888 Bonus Tickets! Explore Betvisa.com!
Wild All Over Grab 58% YB Bonus at Betvisa Casino! Take the challenge!
#betvisaphilippines
Get 88 on your first 50 Experience Betvisa Online’s Bonus Gift!
Weekend Instant Daily Recharge at betvisa.com
https://www.88betvisa.com/
#betvisaphilippines #betvisaonline #betvisacasino
#betvisacom #betvisa.com
Dịch vụ – Điểm Đến Tuyệt Vời Cho Người Chơi Trực Tuyến
Khám Phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
BetVisa được thành lập vào năm 2017 và tiến hành theo bằng trò chơi Curacao với hơn 2 triệu người dùng. Với cam kết đem đến trải nghiệm cá cược chắc chắn và tin cậy nhất, BetVisa nhanh chóng trở thành lựa chọn hàng đầu của người chơi trực tuyến.
BetVisa không chỉ đưa ra các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang lại cho người chơi những chính sách ưu đãi hấp dẫn. Thành viên mới đăng ký sẽ nhận tặng ngay 5 vòng quay miễn phí và có cơ hội giành giải thưởng lớn.
Nền tảng cá cược hỗ trợ nhiều hình thức thanh toán linh hoạt như Betvisa Vietnam, cùng với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có chương trình ưu đãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang lại cho người chơi thời cơ thắng lớn.
Với sự cam kết về trải nghiệm cá cược tốt nhất và dịch vụ khách hàng tận tâm, BetVisa tự tin là điểm đến lý tưởng cho những ai đam mê trò chơi trực tuyến. Hãy đăng ký ngay hôm nay và bắt đầu hành trình của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều tất yếu!
Intro
betvisa india
Betvisa india | IPL 2024 Heat Wave
IPL 2024 Big bets, big prizes With Betvisa India
Exclusive for Sports Fans Betvisa Online Casino 50% Welcome Bonus
Crash Game Supreme Compete for 1,00,00,000 pot Betvisa.com
#betvisaindia
Accurate Predictions IPL T20 Tournament, Winner Takes All!
More than just a game | Betvisa dreams invites you to fly to malta
https://www.b3tvisapro.com/
#betvisaindia #betvisalogin #betvisaonlinecasino
#betvisa.com #betvisaapp
Khám phá Thế Giới Cá Cược Trực Tuyến với BetVisa!
BetVisa, một trong những nền tảng hàng đầu tại châu Á, ra đời vào năm 2017 và hoạt động dưới bằng của Curacao, đã thu hút hơn 2 triệu người dùng trên toàn thế giới. Với lời hứa đem đến trải nghiệm cá cược đảm bảo và tin cậy nhất, BetVisa sớm trở thành lựa chọn hàng đầu của người chơi trực tuyến.
BetVisa không chỉ cung cấp các trò chơi phong phú như xổ số, sòng bạc trực tiếp, thể thao trực tiếp và thể thao điện tử, mà còn mang đến cho người chơi những ưu đãi hấp dẫn. Thành viên mới đăng ký sẽ được tặng ngay 5 cơ hội miễn phí và có cơ hội giành giải thưởng lớn.
Đặc biệt, BetVisa hỗ trợ nhiều cách thức thanh toán linh hoạt như Betvisa Vietnam, cùng với các ưu đãi độc quyền như thưởng chào mừng lên đến 200%. Bên cạnh đó, hàng tuần còn có các chương trình khuyến mãi độc đáo như chương trình giải thưởng Sinh Nhật và Chủ Nhật Mua Sắm Điên Cuồng, mang đến cho người chơi cơ hội thắng lớn.
Nhờ vào tính lời hứa về trải nghiệm thú vị cá cược tốt hơn nhất và dịch vụ khách hàng chuyên môn, BetVisa tự tin là điểm đến lý tưởng cho những ai nhiệt tình trò chơi trực tuyến. Hãy ghi danh ngay hôm nay và bắt đầu chuyến đi của bạn tại BetVisa – nơi niềm vui và may mắn chính là điều quan trọng.
Тренды дизайна интерьера: вдохновение и инновации
Jeetwin Affiliate
Jeetwin Affiliate
Join Jeetwin now! | Jeetwin sign up for a ?500 free bonus
Spin & fish with Jeetwin club! | 200% welcome bonus
Bet on horse racing, get a 50% bonus! | Deposit at Jeetwin live for rewards
#JeetwinAffiliate
Casino table fun at Jeetwin casino login | 50% deposit bonus on table games
Earn Jeetwin points and credits, enhance your play!
https://www.jeetwin-affiliate.com/hi
#JeetwinAffiliate #jeetwinclub #jeetwinsignup #jeetwinresult
#jeetwinlive #jeetwinbangladesh #jeetwincasinologin
Daily recharge bonuses at Jeetwin Bangladesh!
25% recharge bonus on casino games at jeetwin result
15% bonus on Crash Games with Jeetwin affiliate!
Turn to Win Actual Money and Gift Vouchers with JeetWin Affiliate Program
Do you a devotee of internet gaming? Do you really appreciate the adrenaline rush of spinning the roulette wheel and winning big? If so, then the JeetWin’s Referral Program is perfect for you! With JeetWin, you not merely get to partake in stimulating games but additionally have the chance to generate genuine currency and gift certificates just by endorsing the platform to your friends, family, or virtual audience.
How Does it Operate?
Enrolling for the JeetWin’s Partner Program is quick and easy. Once you transform into an partner, you’ll obtain a special referral link that you can share with others. Every time someone joins or makes a deposit using your referral link, you’ll obtain a commission for their activity.
Fantastic Bonuses Await!
As a JeetWin affiliate, you’ll have access to a assortment of captivating bonuses:
500 Sign-Up Bonus: Receive a bountiful sign-up bonus of INR 500 just for joining the program.
Deposit Bonus: Enjoy a enormous 200% bonus when you deposit and play slot and fishing games on the platform.
Unlimited Referral Bonus: Acquire unlimited INR 200 bonuses and rebates for every friend you invite to play on JeetWin.
Exhilarating Games to Play
JeetWin offers a broad range of the most played and most popular games, including Baccarat, Dice, Liveshow, Slot, Fishing, and Sabong. Whether you’re a fan of classic casino games or prefer something more modern and interactive, JeetWin has something for everyone.
Join the Supreme Gaming Experience
With JeetWin Live, you can take your gaming experience to the next level. Take part in thrilling live games such as Lightning Roulette, Lightning Dice, Crazytime, and more. Sign up today and commence an unforgettable gaming adventure filled with excitement and limitless opportunities to win.
Effortless Payment Methods
Depositing funds and withdrawing your winnings on JeetWin is speedy and hassle-free. Choose from a range of payment methods, including E-Wallets, Net Banking, AstroPay, and RupeeO, for seamless transactions.
Don’t Overlook on Exclusive Promotions
As a JeetWin affiliate, you’ll obtain access to exclusive promotions and special offers designed to maximize your earnings. From cash rebates to lucrative bonuses, there’s always something exciting happening at JeetWin.
Get the App
Take the fun with you wherever you go by downloading the JeetWin Mobile Casino App. Available for both iOS and Android devices, the app features a wide range of entertaining games that you can enjoy anytime, anywhere.
Enroll in the JeetWin’s Partner Program Today!
Don’t wait any longer to start earning real cash and exciting rewards with the JeetWin Affiliate Program. Sign up now and be a member of the thriving online gaming community at JeetWin.
Fabulous post. If you’re a gamer looking to enhance your gameplay in Rainbow Six Siege rank matches, prepare for an immersive experience with the game’s realistic tactics and destructible environments. Moreover, consider utilizing the rawaccel tool for Rainbow Six Siege, promising precision and an enhanced gaming journey. Dive into the blog post to discover the top Rainbow Six Siege operators.
Jeetwin Affiliate
Jeetwin Affiliate
Join Jeetwin now! | Jeetwin sign up for a ?500 free bonus
Spin & fish with Jeetwin club! | 200% welcome bonus
Bet on horse racing, get a 50% bonus! | Deposit at Jeetwin live for rewards
#JeetwinAffiliate
Casino table fun at Jeetwin casino login | 50% deposit bonus on table games
Earn Jeetwin points and credits, enhance your play!
https://www.jeetwin-affiliate.com/hi
#JeetwinAffiliate #jeetwinclub #jeetwinsignup #jeetwinresult
#jeetwinlive #jeetwinbangladesh #jeetwincasinologin
Daily recharge bonuses at Jeetwin Bangladesh!
25% recharge bonus on casino games at jeetwin result
15% bonus on Crash Games with Jeetwin affiliate!
Rotate to Win Real Cash and Gift Vouchers with JeetWin Affiliate Program
Do you a fan of web-based gaming? Are you love the adrenaline rush of turning the wheel and succeeding huge? If so, therefore the JeetWin Affiliate Program is ideal for you! With JeetWin Gaming, you not simply get to indulge in exciting games but also have the opportunity to earn genuine currency and gift vouchers simply by marketing the platform to your friends, family, or internet audience.
How Is it Operate?
Enrolling for the JeetWin Affiliate Program is rapid and effortless. Once you become an partner, you’ll acquire a distinctive referral link that you can share with others. Every time someone joins or makes a deposit using your referral link, you’ll earn a commission for their activity.
Fantastic Bonuses Await!
As a member of JeetWin’s affiliate program, you’ll have access to a variety of appealing bonuses:
500 Sign-Up Bonus: Acquire a abundant sign-up bonus of INR 500 just for joining the program.
Deposit Bonus: Take advantage of a whopping 200% bonus when you deposit and play slot machine and fishing games on the platform.
Unlimited Referral Bonus: Receive unlimited INR 200 bonuses and cash rebates for every friend you invite to play on JeetWin.
Exciting Games to Play
JeetWin offers a variety of the most played and most popular games, including Baccarat, Dice, Liveshow, Slot, Fishing, and Sabong. Whether you’re a fan of classic casino games or prefer something more modern and interactive, JeetWin has something for everyone.
Engage in the Supreme Gaming Experience
With JeetWin Live, you can enhance your gaming experience to the next level. Participate in thrilling live games such as Lightning Roulette, Lightning Dice, Crazytime, and more. Sign up today and commence an unforgettable gaming adventure filled with excitement and limitless opportunities to win.
Simple Payment Methods
Depositing funds and withdrawing your winnings on JeetWin is speedy and hassle-free. Choose from a range of payment methods, including E-Wallets, Net Banking, AstroPay, and RupeeO, for seamless transactions.
Don’t Overlook on Exclusive Promotions
As a JeetWin affiliate, you’ll gain access to exclusive promotions and special offers designed to maximize your earnings. From cash rebates to lucrative bonuses, there’s always something exciting happening at JeetWin.
Install the Mobile App
Take the fun with you wherever you go by downloading the JeetWin Mobile Casino App. Available for both iOS and Android devices, the app features a wide range of entertaining games that you can enjoy anytime, anywhere.
Join the JeetWin’s Affiliate Scheme Today!
Don’t wait any longer to start earning real cash and exciting rewards with the JeetWin Affiliate Program. Sign up now and become a part of the thriving online gaming community at JeetWin.
Mostbet https://mostbet-cr-reg.blogspot.com nabizi take bezplatne hry pro zabavu.
Преимущества песка и щебня по ГОСТу: качество и надежность материалов для строительства
Известняковый щебень: применение и разнообразие сортов
Great article! Do you want to learn about Clash of Clans layouts? Well, In Clash of Clans, base design are critical for effective defense against enemy attacks. Some of the most common layouts include the Farming Base, the Trophy Base, the War Base, and many others. To play on that base efficiently, you’ll need a program like scrcpy, which allows you to play on your PC via screen mirroring. For more details, check out the given article link.