AQA GCSE
Chemistry Paper 2
,How do you measure the rate of a reaction? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-Mean rate of reaction = quantity of
product formed/time taken
What units can you measure the rate of a reaction in? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-
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 ANSWERS-Collision theory
What is collision theory? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-
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 ANSWERS-It doubles it
What is a catalyst? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-It is not included in the chemical equation for the reaction
What is a reversible reaction? - CORRECT ANSWERS-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? - CORRECT ANSWERS-
How can you change the direction of a reversible reaction? - CORRECT ANSWERS-By
changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction - CORRECT ANSWERS-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? - CORRECT ANSWERS-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? - CORRECT ANSWERS-The conditions
What happens to an equilibrium if any of the conditions change? - CORRECT
ANSWERS-The system responds to counteract the change
What does Le Chatelier's principle predict? - CORRECT ANSWERS-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? - CORRECT ANSWERS-The system will no longer be
in equilibrium and the concentration of all the substances will change until equilibrium is
reached again
Chemistry Paper 2
,How do you measure the rate of a reaction? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-Mean rate of reaction = quantity of
product formed/time taken
What units can you measure the rate of a reaction in? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-
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 ANSWERS-Collision theory
What is collision theory? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-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 ANSWERS-
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 ANSWERS-It doubles it
What is a catalyst? - CORRECT ANSWERS-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 ANSWERS-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 ANSWERS-It is not included in the chemical equation for the reaction
What is a reversible reaction? - CORRECT ANSWERS-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? - CORRECT ANSWERS-
How can you change the direction of a reversible reaction? - CORRECT ANSWERS-By
changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction - CORRECT ANSWERS-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? - CORRECT ANSWERS-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? - CORRECT ANSWERS-The conditions
What happens to an equilibrium if any of the conditions change? - CORRECT
ANSWERS-The system responds to counteract the change
What does Le Chatelier's principle predict? - CORRECT ANSWERS-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? - CORRECT ANSWERS-The system will no longer be
in equilibrium and the concentration of all the substances will change until equilibrium is
reached again
