AQA GCSE Chemistry Paper 2
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And Correct Answers All Graded
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How do you measure the rate of a reaction? - 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? - 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? - ANSWER✅✅Mean rate of reaction = quantity of
product formed/time taken
What units can you measure the rate of a reaction in? - 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? - 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? -
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?
- ANSWER✅✅Collision theory
What is collision theory? - 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? - 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? - 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? - 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? - 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? - 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? - 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? - ANSWER✅✅It doubles it
What is a catalyst? - 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? - 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? -
ANSWER✅✅It is not included in the chemical equation for the reaction
What is a reversible reaction? - ANSWER✅✅Where the products of a chemical
reaction can react to produce the original reactants
What is the symbol used in reversible reaction equations that shows that the
reaction is reversible? - ANSWER✅✅
How can you change the direction of a reversible reaction? - ANSWER✅✅By
changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction - ANSWER✅✅One direction
will be exothermic and the other direction endothermic
When is equilibrium in a reversible reaction achieved in apparatus which prevents
the escape of reactants and products? - ANSWER✅✅When the rate of the forward
and reverse reactions occur at exactly the same rate
What affects the relative amount of all the reactants and products at equilibrium in
a reversible reaction? - ANSWER✅✅The conditions
What happens to an equilibrium if any of the conditions change? - ANSWER✅✅The
system responds to counteract the change
What does Le Chatelier's principle predict? - ANSWER✅✅The effects of changing
conditions on a system at equilibrium
What affect will changing the concentration of one of the reactants in a reversible
reaction have on the equilibrium? - ANSWER✅✅The system will no longer be in
equilibrium and the concentration of all the substances will change until equilibrium
is reached again
What happens when the concentration of a reactant is increased in a reversible
reaction? - ANSWER✅✅More products will be formed until equilibrium is reached
again
What happens when the concentration of a product is decreased in a reversible
reaction? - ANSWER✅✅More reactant will react until equilibrium is reached again
What happens when the temperature of a system in equilibrium is increased? -
ANSWER✅✅The relative amount of products at equilibrium increases for an
endothermic reaction OR The relative amount of products at equilibrium decreases
for an exothermic reaction
What happens when the temperature of a system in equilibrium is decreased? -
ANSWER✅✅The relative amount of products at equilibrium decreases for an
Exam ,Brand new Exam Questions
And Correct Answers All Graded
A+|GUARANTEED SUCCESS|LATEST
PREMIUM UPDATE 2024-2025
How do you measure the rate of a reaction? - 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? - 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? - ANSWER✅✅Mean rate of reaction = quantity of
product formed/time taken
What units can you measure the rate of a reaction in? - 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? - 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? -
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?
- ANSWER✅✅Collision theory
What is collision theory? - 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? - 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? - 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? - 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? - 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? - 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? - 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? - ANSWER✅✅It doubles it
What is a catalyst? - 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? - 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? -
ANSWER✅✅It is not included in the chemical equation for the reaction
What is a reversible reaction? - ANSWER✅✅Where the products of a chemical
reaction can react to produce the original reactants
What is the symbol used in reversible reaction equations that shows that the
reaction is reversible? - ANSWER✅✅
How can you change the direction of a reversible reaction? - ANSWER✅✅By
changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction - ANSWER✅✅One direction
will be exothermic and the other direction endothermic
When is equilibrium in a reversible reaction achieved in apparatus which prevents
the escape of reactants and products? - ANSWER✅✅When the rate of the forward
and reverse reactions occur at exactly the same rate
What affects the relative amount of all the reactants and products at equilibrium in
a reversible reaction? - ANSWER✅✅The conditions
What happens to an equilibrium if any of the conditions change? - ANSWER✅✅The
system responds to counteract the change
What does Le Chatelier's principle predict? - ANSWER✅✅The effects of changing
conditions on a system at equilibrium
What affect will changing the concentration of one of the reactants in a reversible
reaction have on the equilibrium? - ANSWER✅✅The system will no longer be in
equilibrium and the concentration of all the substances will change until equilibrium
is reached again
What happens when the concentration of a reactant is increased in a reversible
reaction? - ANSWER✅✅More products will be formed until equilibrium is reached
again
What happens when the concentration of a product is decreased in a reversible
reaction? - ANSWER✅✅More reactant will react until equilibrium is reached again
What happens when the temperature of a system in equilibrium is increased? -
ANSWER✅✅The relative amount of products at equilibrium increases for an
endothermic reaction OR The relative amount of products at equilibrium decreases
for an exothermic reaction
What happens when the temperature of a system in equilibrium is decreased? -
ANSWER✅✅The relative amount of products at equilibrium decreases for an
