AQA GCSE · Chemistry 8462

Rate of reaction: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Rate of reaction.

8 questions16 marksFree, no account

Question 1

1 mark

According to collision theory, what is the definition of the activation energy of a reaction?

Question 2

1 mark

In a reversible reaction represented by \(A + B \rightleftharpoons C + D\), if the forward reaction is exothermic, what happens when the temperature of the system is increased?

Question 3

1 mark

(HT only) For the gaseous reversible reaction:
\(2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)\)
What is the effect of increasing the pressure on the position of equilibrium and the rate of reaction?

Question 4

1 mark

A catalyst increases the rate of a chemical reaction by providing an alternative pathway. How does this alternative pathway affect the activation energy?

Question 5

1 mark

Which statement best describes a system that has reached dynamic equilibrium?

Question 6

2 marks

In a chemical reaction, 250 cm³ of gas is produced over a period of 50 seconds. Calculate the mean rate of reaction in \(cm^{3}/s\).

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

Explain, in terms of collision theory, why an increase in the concentration of reactants in a solution increases the rate of reaction.

Write your answer out first, then check it against the worked solution.

Question 8

6 marks

(HT only) A reaction in a closed system is at equilibrium. Explain why increasing the pressure of a gaseous system will shift the position of equilibrium towards the side with the smaller number of molecules.

Write your answer out first, then check it against the worked solution.

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