Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Reversible Reactions and Equilibria
144 practice questions
Topics covered
- Reversibility and dynamic equilibria19 practice questions
- Reversible reactions in a sealed container18 practice questions
- The position of equilibrium20 practice questions
- Changing the pressure19 practice questions
- Changing the temperature19 practice questions
- Adding a catalyst19 practice questions
- The effect of concentration19 practice questions
Practice questions
61–63 of 63 · Normal
Question 61
6 marks · Normal
Answer and see the solution →The following equation represents a reversible reaction carried out in a sealed container:
(a)[2 marks]State what would happen to the position of equilibrium if the temperature of the system is increased.
(b)[2 marks]Explain why a catalyst does not change the position of equilibrium in this reaction.
(c)[2 marks]The reaction mixture is left for several hours at a constant temperature and with a catalyst present. Would changing the catalyst affect the final amount of SO₃ present at equilibrium? Explain your answer.
Question 62
6 marks · Normal
Answer and see the solution →Hydrogen iodide is formed in a reversible reaction:
(a)[3 marks]Explain, in terms of exothermic and endothermic reactions, what happens to the position of equilibrium if the temperature is decreased.
(b)[3 marks]Explain why adding a catalyst to the sealed reaction vessel does not change the position of equilibrium.
Question 63
6 marks · Normal
Answer and see the solution →Consider the equilibrium:
(a)[2 marks]State whether the forward reaction is exothermic or endothermic. Give a reason based on the value of ΔH.
(b)[2 marks]Predict and explain what happens to the amount of PCl₃(g) at equilibrium if the temperature is increased.
(c)[2 marks]State whether adding a catalyst affects the amount of PCl₃(g) present at equilibrium. Explain your answer.