GCSE Chemistry EXAM REVISION TEST QUESTIONS WITH VERIFIED
SOLUTIONS LATEST UPDATE.
Hydrogen is highly flammable, hydrogen is sometimes produced by non-renewable sources,
hydrogen is difficult to store - ANSWER- Give 3 disadvantages of hydrogen fuel cells.
quantity of reactant used up/time taken or quantity of product formed/time taken - ANSWER-
How do you work out the rate of reaction?
Reactions can only happen if particles successfully collide with enough energy. The minimum
energy for a reaction to occur is called the activation energy - ANSWER- What is the collision
theory?
Temperature, concentration of solution or pressure of gas, surface area, catalysts - ANSWER-
What factors affect rate of reaction?
When temperature is increased, particles gain energy which makes them move faster and collide
more frequently. Since the particles have gained energy, more will have enough energy to collide
- ANSWER- How does temperature increase rate of reaction?
If a solution is more concentrated, there are more particles in the same volume. If the pressure of
a gas is increased, there are more particles in a smaller space. Therefore, there are more particles
closer together so collisions are more frequent. - ANSWER- How does concentration/pressure
affect rate of reaction?
Breaking a solid into smaller pieces will give it a larger surface area. Therefore, there will be more
surface area for particles to collide with. - ANSWER- How does surface area affect rate of
reaction?
A catalyst increases the rate of reaction without being used up. They do this by providing an
alternate pathway with a lower activation energy for the reaction to occur. Therefore, more
,particles have enough energy to collide so there are more successful collisions. - ANSWER-
How does a catalyst affect the rate of reaction?
A more reactive metal will displace a less reactive metal from the solution of one of its salts -
ANSWER- How do displacement reactions work?
A rock that contains enough of a metal or metal compound for it to be commercially worthwhile
to extract the metal - ANSWER- What is an ore?
How easy it is to extract it, the amount of metal in the ore, the demand for the metal - ANSWER-
Give 3 factors which affect whether it's worth extracting a metal.
The process that uses electricity to break down ionic compounds to elements - ANSWER- What
is electrolysis?
A molten or aqueous ionic compound - ANSWER- What is the electrolyte in electrolysis?
The negative electrode - ANSWER- Which electrode is the cathode in electrolysis?
The positive electrode - ANSWER- Which electrode is the anode in electrolysis?
They gain electrons and are reduced - ANSWER- What happens to the positive ions in
electrolysis?
They lose electrons and are oxidised - ANSWER- What happens to the negative ions in
electrolysis?
Hydrogen is produced at the cathode unless the other positive ion is less reactive - ANSWER-
If the electrolyte is aqueous in electrolysis, what is produced at the cathode?
,Hydroxide is produced unless a halide is present - ANSWER- If the electrolyte is aqueous in
electrolysis, what is produced at the anode?
Bauxite - ANSWER- What ore does aluminium come from?
Cryolite - ANSWER- What is added to aluminium oxide to reduce the melting point?
Where metals react with substances in their environment and are gradually used up - ANSWER-
What is corrosion?
Rusting - ANSWER- What is the name for the corrosion of iron?
iron + oxygen + water -> hydrated iron (III) oxide - ANSWER- What is the word equation for
the rusting of iron?
It forms a protective barrier around the metal so the iron is not in contact with the air or water
needed for rusting - ANSWER- How does coating a metal with paint, grease, or plastic prevent
rusting/corrosion?
Air and water - ANSWER- What is needed for rusting?
galvanisation is coating a metal e.g. iron with a layer of zinc as zinc is more reactive than iron so
it has a stronger tendency to form positive ions by giving away electrons. Therefore, oxygen and
water reacts with the zinc not the iron. This is called sacrificial protection. - ANSWER- What
is galvanisation and how does it work?
Aluminium doesn't corrode because a protective layer of oxide forms around it - ANSWER-
Why doesn't aluminium corrode?
A mixture of metals - ANSWER- What is an alloy?
, Aircraft as they are lightweight but strong - ANSWER- What are aluminium alloys used for
and why?
Exothermic - ANSWER- Is this exothermic or endothermic?
Endothermic - ANSWER- Is this exothermic or endothermic?
Take in - ANSWER- Does breaking bonds take in or release energy?
Release - ANSWER- Does making bonds take in or release energy?
Combustion, oxidation, neutralisation - ANSWER- Give three examples of exothermic
reactions
Thermal decomposition - ANSWER- Give an example of an endothermic reaction
bond energy of reactants - bond energy of products - ANSWER- How do you work out enthalpy
change?
Exothermic - ANSWER- Does a negative enthalpy change mean the reaction is exothermic or
endothermic?
A system which generates electricity using chemical reactions - ANSWER- What is an
electrochemical cell?
The negative terminal - ANSWER- Which terminal does electricity flow from?
The more reactive metal - ANSWER- Which metal does electricity flow from in a cell?
SOLUTIONS LATEST UPDATE.
Hydrogen is highly flammable, hydrogen is sometimes produced by non-renewable sources,
hydrogen is difficult to store - ANSWER- Give 3 disadvantages of hydrogen fuel cells.
quantity of reactant used up/time taken or quantity of product formed/time taken - ANSWER-
How do you work out the rate of reaction?
Reactions can only happen if particles successfully collide with enough energy. The minimum
energy for a reaction to occur is called the activation energy - ANSWER- What is the collision
theory?
Temperature, concentration of solution or pressure of gas, surface area, catalysts - ANSWER-
What factors affect rate of reaction?
When temperature is increased, particles gain energy which makes them move faster and collide
more frequently. Since the particles have gained energy, more will have enough energy to collide
- ANSWER- How does temperature increase rate of reaction?
If a solution is more concentrated, there are more particles in the same volume. If the pressure of
a gas is increased, there are more particles in a smaller space. Therefore, there are more particles
closer together so collisions are more frequent. - ANSWER- How does concentration/pressure
affect rate of reaction?
Breaking a solid into smaller pieces will give it a larger surface area. Therefore, there will be more
surface area for particles to collide with. - ANSWER- How does surface area affect rate of
reaction?
A catalyst increases the rate of reaction without being used up. They do this by providing an
alternate pathway with a lower activation energy for the reaction to occur. Therefore, more
,particles have enough energy to collide so there are more successful collisions. - ANSWER-
How does a catalyst affect the rate of reaction?
A more reactive metal will displace a less reactive metal from the solution of one of its salts -
ANSWER- How do displacement reactions work?
A rock that contains enough of a metal or metal compound for it to be commercially worthwhile
to extract the metal - ANSWER- What is an ore?
How easy it is to extract it, the amount of metal in the ore, the demand for the metal - ANSWER-
Give 3 factors which affect whether it's worth extracting a metal.
The process that uses electricity to break down ionic compounds to elements - ANSWER- What
is electrolysis?
A molten or aqueous ionic compound - ANSWER- What is the electrolyte in electrolysis?
The negative electrode - ANSWER- Which electrode is the cathode in electrolysis?
The positive electrode - ANSWER- Which electrode is the anode in electrolysis?
They gain electrons and are reduced - ANSWER- What happens to the positive ions in
electrolysis?
They lose electrons and are oxidised - ANSWER- What happens to the negative ions in
electrolysis?
Hydrogen is produced at the cathode unless the other positive ion is less reactive - ANSWER-
If the electrolyte is aqueous in electrolysis, what is produced at the cathode?
,Hydroxide is produced unless a halide is present - ANSWER- If the electrolyte is aqueous in
electrolysis, what is produced at the anode?
Bauxite - ANSWER- What ore does aluminium come from?
Cryolite - ANSWER- What is added to aluminium oxide to reduce the melting point?
Where metals react with substances in their environment and are gradually used up - ANSWER-
What is corrosion?
Rusting - ANSWER- What is the name for the corrosion of iron?
iron + oxygen + water -> hydrated iron (III) oxide - ANSWER- What is the word equation for
the rusting of iron?
It forms a protective barrier around the metal so the iron is not in contact with the air or water
needed for rusting - ANSWER- How does coating a metal with paint, grease, or plastic prevent
rusting/corrosion?
Air and water - ANSWER- What is needed for rusting?
galvanisation is coating a metal e.g. iron with a layer of zinc as zinc is more reactive than iron so
it has a stronger tendency to form positive ions by giving away electrons. Therefore, oxygen and
water reacts with the zinc not the iron. This is called sacrificial protection. - ANSWER- What
is galvanisation and how does it work?
Aluminium doesn't corrode because a protective layer of oxide forms around it - ANSWER-
Why doesn't aluminium corrode?
A mixture of metals - ANSWER- What is an alloy?
, Aircraft as they are lightweight but strong - ANSWER- What are aluminium alloys used for
and why?
Exothermic - ANSWER- Is this exothermic or endothermic?
Endothermic - ANSWER- Is this exothermic or endothermic?
Take in - ANSWER- Does breaking bonds take in or release energy?
Release - ANSWER- Does making bonds take in or release energy?
Combustion, oxidation, neutralisation - ANSWER- Give three examples of exothermic
reactions
Thermal decomposition - ANSWER- Give an example of an endothermic reaction
bond energy of reactants - bond energy of products - ANSWER- How do you work out enthalpy
change?
Exothermic - ANSWER- Does a negative enthalpy change mean the reaction is exothermic or
endothermic?
A system which generates electricity using chemical reactions - ANSWER- What is an
electrochemical cell?
The negative terminal - ANSWER- Which terminal does electricity flow from?
The more reactive metal - ANSWER- Which metal does electricity flow from in a cell?
