Cambridge IGCSE · Chemistry (0620)

Reversible reactions and equilibrium: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Reversible reactions and equilibrium.

10 questions25 marksFree, no account

Question 1

1 mark

In the Haber process for the production of ammonia, which material is the source of nitrogen gas?

Question 2

1 mark

The production of ammonia is shown by the equation:
\(N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)\)

The forward reaction is exothermic. Which change would increase the rate of the reaction but decrease the equilibrium yield of ammonia?

Question 3

1 mark

In the Haber process for the manufacture of ammonia, \(N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)\) (\( \triangle H = -92 \text{ kJ/mol} \)), the operating temperature is maintained at around \(450\,^{\circ}\text{C}\) rather than at a much lower temperature such as \(200\,^{\circ}\text{C}\). Why is this moderate temperature chosen?

Question 4

1 mark

What happens to the appearance of hydrated cobalt(II) chloride crystals when they are heated?

Question 5

1 mark

A reversible reaction is at equilibrium:
\(2A(g) + B(g) \rightleftharpoons 2C(g)\)
The forward reaction is exothermic. Which change would shift the position of equilibrium to the left?

Question 6

2 marks

When hydrated cobalt(II) chloride is heated, its color changes from pink to blue. State the name of the substance that must be added to the blue compound to reverse this color change.

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

Question 7

4 marks

For a reversible reaction \(\text{A(aq)} + \text{B(aq)} \rightleftharpoons \text{C(aq)}\), how does increasing the concentration of reactant \(\text{A}\) affect the position of equilibrium?

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

Question 8

5 marks

Describe the observation when water is added to anhydrous copper(II) sulfate and identify the type of chemical change occurring in terms of hydration.

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

Question 9

5 marks

(a) Hydrated copper(II) sulfate crystals can be used to test for the presence of water.
(i) State the color change observed when water is added to anhydrous copper(II) sulfate.
(ii) Describe how heat affects hydrated copper(II) sulfate crystals, including the name of the process that occurs.

(b) The following reversible reaction is at equilibrium in a closed container:
\(N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)\)
(i) State two characteristics of a system that is in dynamic equilibrium.
(ii) Predict the effect on the position of equilibrium if the concentration of nitrogen, \(N_2\), is increased.

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

Question 10

4 marks

The following equation represents the reversible reaction for the hydration of anhydrous copper(II) sulfate:

\(\text{CuSO}_4\text{(s)} + 5\text{H}_2\text{O(l)} \rightleftharpoons \text{CuSO}_4\cdot5\text{H}_2\text{O(s)}\)

(a) State the color of anhydrous copper(II) sulfate and the color of hydrated copper(II) sulfate.
(b) Describe how you could change hydrated copper(II) sulfate back into anhydrous copper(II) sulfate.
(c) Explain why this reaction is described as reversible.

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

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, marked as you go.