GCSE Chemistry Exam With Most
Examinable Chemistry Questions And
Correct Answers||100%TRUSTED
SOURCE||GRADED A+ LATEST
UPDATE
State the raw materials used in the manufacture of ammonia -ANSWER nitrogen from air
hydrogen from natural gas
State a use for N₂ -ANSWER making ammonia
The following reaction is used to manufacture ammonia in the Haber process
N₂ + 3H₂ → 2NH₃ ΔH = -92KJ/mol
The reaction is carried out at 450°C but the reaction would be faster if a higher
temperature were used.
Suggest why a higher temperature is not used in the Haber process -ANSWER Yield
would decrease and energy costs would increase
State the temperature used for the manufacture of ammonia by the Haber process -
ANSWER 450°C
State the pressure used for the manufacture of ammonia by the Haber process -
ANSWER 200 atm
State the catalyst used for the manufacture of ammonia by the Haber process -ANSWER
Iron
How is ammonia separated from unreacted hydrogen and nitrogen in the Haber
process? -ANSWER The reaction mixture is cooled until the ammonia condenses into a
liquid
What happens to the unreacted hydrogen and nitrogen in the Haber process? -ANSWER
Recycled
State the uses of ammonia -ANSWER manufacture of nitric acid and fertilisers
Suggest the names of two elements, other than nitrogen, that are likely to be present in
NPK fertiliser -ANSWER potassium and phosphorous
Write a chemical equation for the reaction between ammonia and nitric acid -ANSWER
NH₃ + HNO₃ → NH₄NO₃
,State the raw materials used in the manufacture of sulfuric acid. (Triple science only!) -
ANSWER sulphur (from ores)
oxygen (from air)
Describe the manufacture of sulfuric acid by the contact process. (Triple science only!) -
ANSWER 1) Making of sulfur dioxide: S + O₂ → SO₂
2) Reversible step: 2SO₂ + O₂ → 2SO₃ (exothermic)
3) H₂SO₄ + SO₃ → H₂S₂O₇
4) H₂S₂O₇ + H₂O → 2H₂SO₄
State the temperature used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER 450°C
State the pressure used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER 2 atm
State the catalyst used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER Vanadium(V) oxide
State the uses of sulfuric acid. (Triple science only!) -ANSWER manufacture of
detergents, fertilisers and paints
State the name of the gas formed at the anode during the electrolysis sodium chloride
solution. (Triple science only!) -ANSWER chlorine
State the name of the gas formed at the cathode during the electrolysis sodium chloride
solution. (Triple science only!) -ANSWER hydrogen
The solution formed after the electrolysis sodium chloride solution was tested with the
indicator phenolphthalein. The indicator turned pink. Explain this result. (Triple science
only!) -ANSWER The solution is alkali (contains sodium hydroxide)
In the electrolysis of brine, why is thelectrode made out of titanium? (Triple science
only!) -ANSWER To prevent it reacting with the chlorine
Write the two ionic half-equations for the reactions that occur during the electrolysis of
sodium chloride solution. (Triple science only!) -ANSWER 2H⁺ + 2e⁻ → H₂
2Cl⁻ → Cl₂ + 2e⁻
State the uses of sodium hydroxide. (Triple science only!) -ANSWER manufacture of
bleach, paper and soap
State the uses of chlorine. (Triple science only!) -ANSWER sterilising water supplies and
the manufacture of bleach and hydrochloric acid
,Explain what is an addition polymer -ANSWER An addition polymer is large molecule
made by adding many small molecules (each containing a double bond) to form one
much larger molecule
Explain what is a monomer -ANSWER Monomers are the many small molecules (such as
ethene) which add together to make a polymer
Describe, in terms of structure and bonding, what happens when ethene molecules are
converted into poly(ethene) -ANSWER One bond in the double bond breaks. Monomers
join together to form a long chain. Polymer contains only single bonds
Draw the equation to show the formation of poly(ethene) -ANSWER
Draw the equation to show the formation of poly(propene) -ANSWER
Draw the displayed formula for the repeat unit of poly(ethene) -ANSWER
Draw the displayed formula for the repeat unit of poly(propene) -ANSWER
Draw the displayed formula for the repeat unit of poly(chloroethene). (Triple science
only!) -ANSWER
State the uses of poly(ethene) -ANSWER Plastic bags and bottles
State the uses of poly(propene) -ANSWER Plastic crates and ropes
State uses for poly(chloroethene). (Triple science only!) -ANSWER Plastic piping and
cable insulation
What is meant by the term biodegradable? -ANSWER The break down of a substance by
microorganisms
Explain why addition polymers are hard to dispose of -ANSWER They are inert as they
have strong C-C bonds.
This makes them non-biodegradeable.
What type of reaction is used to form nylon? (Triple science only!) -ANSWER
Condensation polymerisation
During condensation polymerisation, what else forms other than the polymer? (Triple
science only!) -ANSWER A small molecule such as H₂0 or HCl
What is crude oil? -ANSWER A mixture of hydrocarbons
, Explain how crude oil is separated into fractions -ANSWER Crude oil is separated by
fractional distillation.
Crude oil is heated and the oil evaporates.
It then goes into the tower.
As the vapours rise up the tower the temperature falls.
Different sized fractions condense at different heights because they have different
boiling points.
Smaller molecules condense high up the tower.
Larger molecules condense low down in the tower.
Then the fractions are collected.
Recall the names of the main fractions obtained from crude oil -ANSWER refinery gases
gasoline
kerosene
diesel
fuel oil
bitumen
Recall a use of refinery gases -ANSWER Bottled gas
Recall a use of gasoline -ANSWER Fuel for cars
Recall a use of kerosene -ANSWER Fuel for aeroplanes
Recall a use of diesel -ANSWER Fuel for lorries
Recall a use of fuel oil -ANSWER Fuel for ships
Recall a use of bitumen -ANSWER Surfacing roads
Describe the trend in boiling points of the main fractions in crude oil -ANSWER Boiling
point increases as the number of carbon atoms (chain length) increase
Describe the trend in viscosity of the main fractions in crude -ANSWER Viscosity
increases as the number of carbon atoms (chain length) increase
Which fraction of crude oil has the lowest boiling point? -ANSWER Refinery gases
What is meant by the term viscosity? -ANSWER The viscosity of a fluid describes how
easily it flows.
Water has a low viscosity, it flows very easily.
Crude oil has a higher viscosity than water, it does not flow very easily.
Which fraction of crude oil is the most viscous? -ANSWER Bitumen
Examinable Chemistry Questions And
Correct Answers||100%TRUSTED
SOURCE||GRADED A+ LATEST
UPDATE
State the raw materials used in the manufacture of ammonia -ANSWER nitrogen from air
hydrogen from natural gas
State a use for N₂ -ANSWER making ammonia
The following reaction is used to manufacture ammonia in the Haber process
N₂ + 3H₂ → 2NH₃ ΔH = -92KJ/mol
The reaction is carried out at 450°C but the reaction would be faster if a higher
temperature were used.
Suggest why a higher temperature is not used in the Haber process -ANSWER Yield
would decrease and energy costs would increase
State the temperature used for the manufacture of ammonia by the Haber process -
ANSWER 450°C
State the pressure used for the manufacture of ammonia by the Haber process -
ANSWER 200 atm
State the catalyst used for the manufacture of ammonia by the Haber process -ANSWER
Iron
How is ammonia separated from unreacted hydrogen and nitrogen in the Haber
process? -ANSWER The reaction mixture is cooled until the ammonia condenses into a
liquid
What happens to the unreacted hydrogen and nitrogen in the Haber process? -ANSWER
Recycled
State the uses of ammonia -ANSWER manufacture of nitric acid and fertilisers
Suggest the names of two elements, other than nitrogen, that are likely to be present in
NPK fertiliser -ANSWER potassium and phosphorous
Write a chemical equation for the reaction between ammonia and nitric acid -ANSWER
NH₃ + HNO₃ → NH₄NO₃
,State the raw materials used in the manufacture of sulfuric acid. (Triple science only!) -
ANSWER sulphur (from ores)
oxygen (from air)
Describe the manufacture of sulfuric acid by the contact process. (Triple science only!) -
ANSWER 1) Making of sulfur dioxide: S + O₂ → SO₂
2) Reversible step: 2SO₂ + O₂ → 2SO₃ (exothermic)
3) H₂SO₄ + SO₃ → H₂S₂O₇
4) H₂S₂O₇ + H₂O → 2H₂SO₄
State the temperature used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER 450°C
State the pressure used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER 2 atm
State the catalyst used for the manufacture of sulfuric acid by the contact process.
(Triple science only!) -ANSWER Vanadium(V) oxide
State the uses of sulfuric acid. (Triple science only!) -ANSWER manufacture of
detergents, fertilisers and paints
State the name of the gas formed at the anode during the electrolysis sodium chloride
solution. (Triple science only!) -ANSWER chlorine
State the name of the gas formed at the cathode during the electrolysis sodium chloride
solution. (Triple science only!) -ANSWER hydrogen
The solution formed after the electrolysis sodium chloride solution was tested with the
indicator phenolphthalein. The indicator turned pink. Explain this result. (Triple science
only!) -ANSWER The solution is alkali (contains sodium hydroxide)
In the electrolysis of brine, why is thelectrode made out of titanium? (Triple science
only!) -ANSWER To prevent it reacting with the chlorine
Write the two ionic half-equations for the reactions that occur during the electrolysis of
sodium chloride solution. (Triple science only!) -ANSWER 2H⁺ + 2e⁻ → H₂
2Cl⁻ → Cl₂ + 2e⁻
State the uses of sodium hydroxide. (Triple science only!) -ANSWER manufacture of
bleach, paper and soap
State the uses of chlorine. (Triple science only!) -ANSWER sterilising water supplies and
the manufacture of bleach and hydrochloric acid
,Explain what is an addition polymer -ANSWER An addition polymer is large molecule
made by adding many small molecules (each containing a double bond) to form one
much larger molecule
Explain what is a monomer -ANSWER Monomers are the many small molecules (such as
ethene) which add together to make a polymer
Describe, in terms of structure and bonding, what happens when ethene molecules are
converted into poly(ethene) -ANSWER One bond in the double bond breaks. Monomers
join together to form a long chain. Polymer contains only single bonds
Draw the equation to show the formation of poly(ethene) -ANSWER
Draw the equation to show the formation of poly(propene) -ANSWER
Draw the displayed formula for the repeat unit of poly(ethene) -ANSWER
Draw the displayed formula for the repeat unit of poly(propene) -ANSWER
Draw the displayed formula for the repeat unit of poly(chloroethene). (Triple science
only!) -ANSWER
State the uses of poly(ethene) -ANSWER Plastic bags and bottles
State the uses of poly(propene) -ANSWER Plastic crates and ropes
State uses for poly(chloroethene). (Triple science only!) -ANSWER Plastic piping and
cable insulation
What is meant by the term biodegradable? -ANSWER The break down of a substance by
microorganisms
Explain why addition polymers are hard to dispose of -ANSWER They are inert as they
have strong C-C bonds.
This makes them non-biodegradeable.
What type of reaction is used to form nylon? (Triple science only!) -ANSWER
Condensation polymerisation
During condensation polymerisation, what else forms other than the polymer? (Triple
science only!) -ANSWER A small molecule such as H₂0 or HCl
What is crude oil? -ANSWER A mixture of hydrocarbons
, Explain how crude oil is separated into fractions -ANSWER Crude oil is separated by
fractional distillation.
Crude oil is heated and the oil evaporates.
It then goes into the tower.
As the vapours rise up the tower the temperature falls.
Different sized fractions condense at different heights because they have different
boiling points.
Smaller molecules condense high up the tower.
Larger molecules condense low down in the tower.
Then the fractions are collected.
Recall the names of the main fractions obtained from crude oil -ANSWER refinery gases
gasoline
kerosene
diesel
fuel oil
bitumen
Recall a use of refinery gases -ANSWER Bottled gas
Recall a use of gasoline -ANSWER Fuel for cars
Recall a use of kerosene -ANSWER Fuel for aeroplanes
Recall a use of diesel -ANSWER Fuel for lorries
Recall a use of fuel oil -ANSWER Fuel for ships
Recall a use of bitumen -ANSWER Surfacing roads
Describe the trend in boiling points of the main fractions in crude oil -ANSWER Boiling
point increases as the number of carbon atoms (chain length) increase
Describe the trend in viscosity of the main fractions in crude -ANSWER Viscosity
increases as the number of carbon atoms (chain length) increase
Which fraction of crude oil has the lowest boiling point? -ANSWER Refinery gases
What is meant by the term viscosity? -ANSWER The viscosity of a fluid describes how
easily it flows.
Water has a low viscosity, it flows very easily.
Crude oil has a higher viscosity than water, it does not flow very easily.
Which fraction of crude oil is the most viscous? -ANSWER Bitumen
