AQA GCSE Chemistry Paper 2 TEST BANK EXAM LATEST
WITH ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+\London South Bank
University
What is collision theory?
Chemical reactions can occur only when reacting particles collide with
each other and with sufficient energy
What is the activation energy of a reaction?
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?
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?
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?
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?
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?
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?
It doubles it
What is a catalyst?
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?
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?
It is not included in the chemical equation for the reaction
What is a reversible reaction?
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?
How can you change the direction of a reversible reaction?
By changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction
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?
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?
The conditions
What happens to an equilibrium if any of the conditions change?
The system responds to counteract the change
What does Le Chatelier's principle predict?
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?
The system will no longer be in equilibrium and the concentration of all the
substances will change until equilibrium is reached again
WITH ACTUAL QUESTIONS AND CORRECT VERIFIED
ANSWERS ALREADY GRADED A+\London South Bank
University
What is collision theory?
Chemical reactions can occur only when reacting particles collide with
each other and with sufficient energy
What is the activation energy of a reaction?
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?
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?
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?
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?
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?
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?
It doubles it
What is a catalyst?
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?
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?
It is not included in the chemical equation for the reaction
What is a reversible reaction?
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?
How can you change the direction of a reversible reaction?
By changing the conditions; for example heating or cooling the reaction
Describe the energy changes in a reversible reaction
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?
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?
The conditions
What happens to an equilibrium if any of the conditions change?
The system responds to counteract the change
What does Le Chatelier's principle predict?
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?
The system will no longer be in equilibrium and the concentration of all the
substances will change until equilibrium is reached again
