AQA GCSE CHEMISTRY PAPER 2 CHEMISTRY COURSE
2025/2026 | QUESTION BANK | VERIFIED QUESTIONS AND
ANSWERS GRADED A+ | CHEMICAL REACTIONS,
ANALYSIS & ENERGY CHANGES STUDY GUIDE |
GUARANTEED SUCCESS
What is crude oil formed from? - CORRECT ANSWER - -The remains of an
ancient biomass consisting mainly of plankton that was buried in mud
What chemically is crude oil? - CORRECT ANSWER - -A mixture of a large
number of compounds; mainly hydrocarbons
What is a hydrocarbon? - CORRECT ANSWER - -A molecule made up of
carbon and hydrogen only
What type of hydrocarbons are most of those found in crude oil? - CORRECT
ANSWER - -Alkanes
What is the general formula of alkanes? - CORRECT ANSWER - -CnH2n + 2
What are the first four members of the homologous series of alkanes called? -
CORRECT ANSWER - -Methane, ethane, propane and butane
What is a homologous series? - CORRECT ANSWER - -A family of organic
compounds that have the same functional group, similar chemical properties
and the same general formula
How can you separate crude oil into fractions? - CORRECT ANSWER - -By
fractional distillation
,What does each fraction of crude oil contain? - CORRECT ANSWER - -
Molecules with a similar number of carbon atoms
What can we use each fraction of crude oil for? - CORRECT ANSWER - -As
fuels or feedstocks for the petrochemical industry
Name five fuels produced from crude oil - CORRECT ANSWER - -Petrol,
diesel, kerosene, heavy fuel oil and liquified petroleum gases
Name four useful materials produced by the petrochemical industry from crude
oil fractions - CORRECT ANSWER - -Solvents, lubricants, polymers and
detergents
Why are there such a vast range of natural and synthetic carbon compounds? -
CORRECT ANSWER - -Because of carbon atoms' ability to form families of
compounds
Describe the four steps involved in fractional distillation - CORRECT
ANSWER - -Crude oil is heated to evaporate it and turn it into a vapour, the
vapour rises through the column and cools, the vapours condense when they are
cool enough, and liquids are removed from the column at different heights
What three properties of hydrocarbon change as the size of the molecule
increase? - CORRECT ANSWER - -Boiling point, viscosity and flammability
How do you measure the rate of a reaction? - CORRECT ANSWER - -By
measuring the quantity of a reactant used or the quantity of product formed over
time
What is the equation for calculating the mean rate of a reaction by measuring
the amount of reactant used? - CORRECT ANSWER - -Mean rate of reaction
= quantity of reactant used/time taken
,What is the equation for calculating the mean rate of a reaction by measuring
the amount of product formed? - CORRECT ANSWER - -Mean rate of
reaction = quantity of product formed/time taken
What units can you measure the rate of a reaction in? - CORRECT ANSWER
- -g/s or cm3/s or mol/s
How do you calculate the rate of a reaction at a specific time from graph of the
quantity of reactant used or the quantity of product formed? - CORRECT
ANSWER - -By measuring the gradient of a tangent drawn at that specific time
on the graph
What are the five factors that can affect the rate of a reaction? - CORRECT
ANSWER - -Concentration of reactants in solution, pressure of reacting gases,
surface area of solid reactants, temperature and the presence of a catalyst
What theory can we use to explain how various factors affect the rate of a
reaction? - CORRECT ANSWER - -Collision theory
What is collision theory? - CORRECT ANSWER - -Chemical reactions can
occur only when reacting particles collide with each other and with sufficient
energy
What is the activation energy of a reaction? - CORRECT ANSWER - -The
minimum amount of energy that particles must have to react
According to collision theory why does increasing concentration of reactant in
solution increase the rate of the reaction? - CORRECT ANSWER - -It
increases the frequency of collisions and so increases the rate of reaction
, According to collision theory why does increasing the pressure of reacting gases
increase the rate of the reaction? - CORRECT ANSWER - -It increases the
frequency of collisions and so increases the rate of reaction
According to collision theory why does increasing the surface area of solid
reactants in solution increase the rate of the reaction? - CORRECT ANSWER
- -It increases the frequency of collisions and so increases the rate of reaction
According to collision theory why does increasing temperature increase the rate
of the reaction? - CORRECT ANSWER - -It increases the frequency of
collisions and makes the collision more energetic and so increases the rate of
reaction
How do you increase the surface area of a solid reactant? - CORRECT
ANSWER - -Grind it into a powder that has smaller particle size
What effect does increasing the temperature of a reaction by 10°C have on the
rate of a reaction? - CORRECT ANSWER - -It doubles it
What is a catalyst? - CORRECT ANSWER - -A chemical that changes the rate
of a chemical reaction but is not used up in the reaction
How do catalysts increase the rate of a reaction? - CORRECT ANSWER - -By
providing a different pathway for the reaction that has a lower activation energy
How do you know in a reaction that a chemical is used in a reaction is a
catalyst? - CORRECT ANSWER - -It is not included in the chemical equation
for the reaction
What is a reversible reaction? - CORRECT ANSWER - -Where the products
of a chemical reaction can react to produce the original reactants
2025/2026 | QUESTION BANK | VERIFIED QUESTIONS AND
ANSWERS GRADED A+ | CHEMICAL REACTIONS,
ANALYSIS & ENERGY CHANGES STUDY GUIDE |
GUARANTEED SUCCESS
What is crude oil formed from? - CORRECT ANSWER - -The remains of an
ancient biomass consisting mainly of plankton that was buried in mud
What chemically is crude oil? - CORRECT ANSWER - -A mixture of a large
number of compounds; mainly hydrocarbons
What is a hydrocarbon? - CORRECT ANSWER - -A molecule made up of
carbon and hydrogen only
What type of hydrocarbons are most of those found in crude oil? - CORRECT
ANSWER - -Alkanes
What is the general formula of alkanes? - CORRECT ANSWER - -CnH2n + 2
What are the first four members of the homologous series of alkanes called? -
CORRECT ANSWER - -Methane, ethane, propane and butane
What is a homologous series? - CORRECT ANSWER - -A family of organic
compounds that have the same functional group, similar chemical properties
and the same general formula
How can you separate crude oil into fractions? - CORRECT ANSWER - -By
fractional distillation
,What does each fraction of crude oil contain? - CORRECT ANSWER - -
Molecules with a similar number of carbon atoms
What can we use each fraction of crude oil for? - CORRECT ANSWER - -As
fuels or feedstocks for the petrochemical industry
Name five fuels produced from crude oil - CORRECT ANSWER - -Petrol,
diesel, kerosene, heavy fuel oil and liquified petroleum gases
Name four useful materials produced by the petrochemical industry from crude
oil fractions - CORRECT ANSWER - -Solvents, lubricants, polymers and
detergents
Why are there such a vast range of natural and synthetic carbon compounds? -
CORRECT ANSWER - -Because of carbon atoms' ability to form families of
compounds
Describe the four steps involved in fractional distillation - CORRECT
ANSWER - -Crude oil is heated to evaporate it and turn it into a vapour, the
vapour rises through the column and cools, the vapours condense when they are
cool enough, and liquids are removed from the column at different heights
What three properties of hydrocarbon change as the size of the molecule
increase? - CORRECT ANSWER - -Boiling point, viscosity and flammability
How do you measure the rate of a reaction? - CORRECT ANSWER - -By
measuring the quantity of a reactant used or the quantity of product formed over
time
What is the equation for calculating the mean rate of a reaction by measuring
the amount of reactant used? - CORRECT ANSWER - -Mean rate of reaction
= quantity of reactant used/time taken
,What is the equation for calculating the mean rate of a reaction by measuring
the amount of product formed? - CORRECT ANSWER - -Mean rate of
reaction = quantity of product formed/time taken
What units can you measure the rate of a reaction in? - CORRECT ANSWER
- -g/s or cm3/s or mol/s
How do you calculate the rate of a reaction at a specific time from graph of the
quantity of reactant used or the quantity of product formed? - CORRECT
ANSWER - -By measuring the gradient of a tangent drawn at that specific time
on the graph
What are the five factors that can affect the rate of a reaction? - CORRECT
ANSWER - -Concentration of reactants in solution, pressure of reacting gases,
surface area of solid reactants, temperature and the presence of a catalyst
What theory can we use to explain how various factors affect the rate of a
reaction? - CORRECT ANSWER - -Collision theory
What is collision theory? - CORRECT ANSWER - -Chemical reactions can
occur only when reacting particles collide with each other and with sufficient
energy
What is the activation energy of a reaction? - CORRECT ANSWER - -The
minimum amount of energy that particles must have to react
According to collision theory why does increasing concentration of reactant in
solution increase the rate of the reaction? - CORRECT ANSWER - -It
increases the frequency of collisions and so increases the rate of reaction
, According to collision theory why does increasing the pressure of reacting gases
increase the rate of the reaction? - CORRECT ANSWER - -It increases the
frequency of collisions and so increases the rate of reaction
According to collision theory why does increasing the surface area of solid
reactants in solution increase the rate of the reaction? - CORRECT ANSWER
- -It increases the frequency of collisions and so increases the rate of reaction
According to collision theory why does increasing temperature increase the rate
of the reaction? - CORRECT ANSWER - -It increases the frequency of
collisions and makes the collision more energetic and so increases the rate of
reaction
How do you increase the surface area of a solid reactant? - CORRECT
ANSWER - -Grind it into a powder that has smaller particle size
What effect does increasing the temperature of a reaction by 10°C have on the
rate of a reaction? - CORRECT ANSWER - -It doubles it
What is a catalyst? - CORRECT ANSWER - -A chemical that changes the rate
of a chemical reaction but is not used up in the reaction
How do catalysts increase the rate of a reaction? - CORRECT ANSWER - -By
providing a different pathway for the reaction that has a lower activation energy
How do you know in a reaction that a chemical is used in a reaction is a
catalyst? - CORRECT ANSWER - -It is not included in the chemical equation
for the reaction
What is a reversible reaction? - CORRECT ANSWER - -Where the products
of a chemical reaction can react to produce the original reactants
