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
41–50 of 144
Question 41
2 marks · Easy
Answer and see the solution →The reversible reaction below is in a sealed container at equilibrium:
There are equal numbers of moles of gas on both sides of the equation, and the forward reaction is endothermic.
Explain, with a reason, the effect on the position of equilibrium if the pressure is increased.
Question 42
1 mark · Easy
Answer and see the solution →In a reversible reaction in a sealed container, what happens to the concentrations of reactants and products at equilibrium?
Question 43
3 marks · Easy
Answer and see the solution →A reversible reaction is shown below and is carried out in a sealed container: The forward reaction is endothermic.
(a)[1 mark]State what will happen to the position of equilibrium if the temperature is increased.
(b)[1 mark]State what happens to the amount of if the pressure is decreased.
(c)[1 mark]Give a reason for your answer to part (b).
Question 44
2 marks · Easy
Answer and see the solution →Consider the equilibrium: At equilibrium in a sealed container, there are 2.0 mol of and 4.0 mol of . The forward reaction is exothermic. The temperature is now increased. Calculate the change in the amount of expected at the new equilibrium and explain your answer.
Question 45
4 marks · Normal
Answer and see the solution →Methanol can be produced from carbon monoxide and hydrogen:
This reaction is reversible and carried out in a sealed container.
(a)[2 marks]Explain what happens to the position of equilibrium when the temperature is increased, assuming the forward reaction is exothermic.
(b)[2 marks]Describe how increasing the pressure will affect the position of equilibrium.
Question 46
3 marks · Normal
Answer and see the solution →Ethene (3) reacts reversibly with steam to form ethanol (85):
The forward reaction is exothermic.
Explain, with reasons, the effect of decreasing both temperature and pressure on the yield of ethanol at equilibrium.
Question 47
2 marks · Normal
Answer and see the solution →State and explain what would happen to the position of equilibrium if the pressure is decreased for the following reaction in a sealed container:
Question 48
4 marks · Normal
Answer and see the solution →Ammonia is made in the Haber process:
The forward reaction is exothermic.
(a)[2 marks]Explain what happens to the yield of ammonia if the temperature is increased.
(b)[2 marks]Describe and explain the effect of increasing pressure on the position of equilibrium.
Question 49
2 marks · Normal
Answer and see the solution →A reversible reaction is shown below: The forward reaction is exothermic. Explain what will happen to the position of equilibrium if the temperature is increased.
Question 50
3 marks · Normal
Answer and see the solution →Hydrogen iodide is formed in the reversible reaction: The forward reaction is endothermic. A closed container starts with 0.50 mol of hydrogen, 0.50 mol of iodine, and no hydrogen iodide. The mixture is allowed to reach equilibrium. State and explain what will happen to the amount of hydrogen iodide present at equilibrium if the pressure is doubled (assume temperature is kept constant and all substances are gases, with equal volumes occupied).