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
21–30 of 57 · Easy
Question 21
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 22
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 23
1 mark · Easy
Answer and see the solution →State the type of reactions, in terms of phases, that are affected by changes in pressure at equilibrium.
Question 24
3 marks · Easy
Answer and see the solution →Nitrogen dioxide and dinitrogen tetroxide are involved in the following equilibrium:
(a)[1 mark]State the total number of gaseous molecules on each side of the equation.
(b)[1 mark]If the pressure of the system is increased, predict which direction the equilibrium will shift.
(c)[1 mark]Explain your answer to part (b) in terms of gas molecules.
Question 25
2 marks · Easy
Answer and see the solution →For the following equilibrium reaction, calculate the difference in the total number of gaseous molecules between the left and right sides.
Question 26
2 marks · Easy
Answer and see the solution →Consider the following equilibrium:
Explain, with a reason, what would happen to the position of equilibrium if the pressure is decreased.
Question 27
3 marks · Easy
Answer and see the solution →For the following equilibrium:
A chemist measured the percentage of E(g), F(g), and G(g) at equilibrium under different pressure conditions. Use the data to answer the questions.
Condition % E(g) % F(g) % G(g) Low pressure 30 30 40 High pressure 25 25 50 (a)[1 mark]State the number of gaseous molecules on each side of the equation.
(b)[1 mark]Describe the effect of increasing the pressure on the position of equilibrium, using the data.
(c)[1 mark]Explain your answer to part (b).
Question 28
1 mark · Easy
Answer and see the solution →The following reaction is at equilibrium in a container:
If the pressure is increased, which direction will the equilibrium shift?
Question 29
3 marks · Easy
Answer and see the solution →Consider the following equilibrium, which is carried out in a sealed container:
(a)[1 mark]State the number of gas molecules on the left and the right side of the equation.
(b)[1 mark]State what will happen to the equilibrium position if the pressure is increased.
(c)[1 mark]Give a reason for your answer to part (b).
Question 30
2 marks · Easy
Answer and see the solution →The following reaction is at equilibrium at 400 K:
If the total pressure is doubled, predict the effect on the amount of A(g) formed at equilibrium. Show your reasoning.
(a)[1 mark]Calculate the number of gaseous molecules on each side of the equation.
(b)[1 mark]State whether the amount of A(g) at equilibrium will increase, decrease, or stay the same. Explain your answer.