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Reversible reactions and dynamic equilibrium: AQA GCSE Combined Science questions

Every AQA GCSE Combined Science exam question on 5.6.2 Reversible reactions and dynamic equilibrium, 2018–2025, with its mark scheme and examiner’s report.

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3,069 questions

  1. Q04.2

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 04.2: How much energy is transferred when methanol is decomposed into carbon monoxide and hydrogen? [1 mark] Tick () one box. < 91 kJ/mol 91 kJ/mol > 91 kJ/mol

  2. Q04.3

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 04.3: A scientist developed a principle to predict the effect of changing conditions on a system at equilibrium. What was the name of the scientist? [1 mark]

  3. Q04.4

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 04.4: What is the effect of increasing the temperature on the proportion of methanol in the equilibrium mixture? [1 mark] Tick () one box. The proportion of methanol

  4. Q04.5

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.6.1 Rate of reaction5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 04.5: What is the effect of using a catalyst on the proportion of methanol in the equilibrium mixture? [1 mark] Tick () one box. The proportion of methanol decreases

  5. Q04.6

    June 2025 · Chemistry Paper 2 Higher

    3 marks5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 04.6: Explain the effect of increasing the pressure on the proportion of methanol in the equilibrium mixture. [3 marks]

  6. Q03.7

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 03.7: Suggest one observation that could be made when water is added to anhydrous cobalt chloride. [1 mark]

  7. Q03.8

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 03.8: The reaction between anhydrous cobalt chloride and water is exothermic. What type of reaction is the reverse reaction? [1 mark]

  8. Q05.1

    June 2024 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.1: What is the amount of energy transferred during the reverse reaction? [1 mark] Tick () one box. < 198 kJ/mol = 198 kJ/mol > 198 kJ/mol

  9. Q05.2

    June 2024 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.2: The concentration of oxygen is increased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the l

  10. Q05.3

    June 2024 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.3: The pressure is decreased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the left Equilibrium

  11. Q05.4

    June 2024 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.4: The temperature is increased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the left Equilibr

  12. Q05.5

    June 2024 · Chemistry Paper 2 Higher

    2 marks5.6.1 Rate of reaction5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.5: A catalyst is used in the reaction. Suggest what effect the catalyst has on the position of the equilibrium. Give one reason for your answer. [2 marks] Effect R

  13. Q05.6

    June 2024 · Chemistry Paper 2 Higher

    3 marks5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Higher, question 05.6: Determine the time taken for the reaction to reach equilibrium. Explain your answer. Use Figure 5. [3 marks] Time s Explanation

  14. Q02.2

    June 2024 · Chemistry Paper 2 Foundation

    2 marks5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Foundation, question 02.2: Complete the sentence. Choose answers from the box. [2 marks] blue green red white yellow When water is added to anhydrous copper sulfate, the colour changes fr

  15. Q02.3

    June 2024 · Chemistry Paper 2 Foundation

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2024 Chemistry Paper 2 Foundation, question 02.3: The reaction between anhydrous copper sulfate and water is reversible. How does the word equation show that the reaction is reversible? [1 mark]

  16. Q04.4

    June 2023 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2023 Chemistry Paper 2 Higher, question 04.4: What is meant by the symbol ⇌? [1 mark]

  17. Q04.5

    June 2023 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2023 Chemistry Paper 2 Higher, question 04.5: The reaction is at equilibrium. The reaction is exothermic. What happens to the equilibrium position when the temperature is increased? [1 mark] Tick () one bo

  18. Q03.5

    June 2023 · Chemistry Paper 2 Foundation

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2023 Chemistry Paper 2 Foundation, question 03.5: Chlorine is used to sterilise water. The reaction between chlorine and water is reversible. Complete the sentence. [1 mark] Equilibrium is reached when the forw

  19. Q06.3

    June 2022 · Chemistry Paper 2 Higher

    1 mark5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2022 Chemistry Paper 2 Higher, question 06.3: What can scientists predict using Le Chatelier’s Principle? [1 mark]

  20. Q06.4

    June 2022 · Chemistry Paper 2 Higher

    2 marks5.6.2 Reversible reactions and dynamic equilibrium
    The whole paper ↗
    June 2022 Chemistry Paper 2 Higher, question 06.4: Describe how a reversible chemical reaction is able to reach equilibrium. [2 marks]
All 42 questions on Reversible reactions and dynamic equilibrium, as a list
  1. June 2025, Chemistry Paper 2 Higher, Q04.2 (1 mark): How much energy is transferred when methanol is decomposed into carbon monoxide and hydrogen? [1 mark] Tick () one box. < 91 kJ/mol 91 kJ/mol > 91 kJ/mol
  2. June 2025, Chemistry Paper 2 Higher, Q04.3 (1 mark): A scientist developed a principle to predict the effect of changing conditions on a system at equilibrium. What was the name of the scientist? [1 mark]
  3. June 2025, Chemistry Paper 2 Higher, Q04.4 (1 mark): What is the effect of increasing the temperature on the proportion of methanol in the equilibrium mixture? [1 mark] Tick () one box. The proportion of methanol
  4. June 2025, Chemistry Paper 2 Higher, Q04.5 (1 mark): What is the effect of using a catalyst on the proportion of methanol in the equilibrium mixture? [1 mark] Tick () one box. The proportion of methanol decreases
  5. June 2025, Chemistry Paper 2 Higher, Q04.6 (3 marks): Explain the effect of increasing the pressure on the proportion of methanol in the equilibrium mixture. [3 marks]
  6. June 2025, Chemistry Paper 2 Foundation, Q03.7 (1 mark): Suggest one observation that could be made when water is added to anhydrous cobalt chloride. [1 mark]
  7. June 2025, Chemistry Paper 2 Foundation, Q03.8 (1 mark): The reaction between anhydrous cobalt chloride and water is exothermic. What type of reaction is the reverse reaction? [1 mark]
  8. June 2024, Chemistry Paper 2 Higher, Q05.1 (1 mark): What is the amount of energy transferred during the reverse reaction? [1 mark] Tick () one box. < 198 kJ/mol = 198 kJ/mol > 198 kJ/mol
  9. June 2024, Chemistry Paper 2 Higher, Q05.2 (1 mark): The concentration of oxygen is increased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the l
  10. June 2024, Chemistry Paper 2 Higher, Q05.3 (1 mark): The pressure is decreased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the left Equilibrium
  11. June 2024, Chemistry Paper 2 Higher, Q05.4 (1 mark): The temperature is increased. What is the effect on the position of the equilibrium? [1 mark] Tick () one box. Equilibrium position shifts to the left Equilibr
  12. June 2024, Chemistry Paper 2 Higher, Q05.5 (2 marks): A catalyst is used in the reaction. Suggest what effect the catalyst has on the position of the equilibrium. Give one reason for your answer. [2 marks] Effect R
  13. June 2024, Chemistry Paper 2 Higher, Q05.6 (3 marks): Determine the time taken for the reaction to reach equilibrium. Explain your answer. Use Figure 5. [3 marks] Time s Explanation
  14. June 2024, Chemistry Paper 2 Foundation, Q02.2 (2 marks): Complete the sentence. Choose answers from the box. [2 marks] blue green red white yellow When water is added to anhydrous copper sulfate, the colour changes fr
  15. June 2024, Chemistry Paper 2 Foundation, Q02.3 (1 mark): The reaction between anhydrous copper sulfate and water is reversible. How does the word equation show that the reaction is reversible? [1 mark]
  16. June 2023, Chemistry Paper 2 Higher, Q04.4 (1 mark): What is meant by the symbol ⇌? [1 mark]
  17. June 2023, Chemistry Paper 2 Higher, Q04.5 (1 mark): The reaction is at equilibrium. The reaction is exothermic. What happens to the equilibrium position when the temperature is increased? [1 mark] Tick () one bo
  18. June 2023, Chemistry Paper 2 Foundation, Q03.5 (1 mark): Chlorine is used to sterilise water. The reaction between chlorine and water is reversible. Complete the sentence. [1 mark] Equilibrium is reached when the forw
  19. June 2022, Chemistry Paper 2 Higher, Q06.3 (1 mark): What can scientists predict using Le Chatelier’s Principle? [1 mark]
  20. June 2022, Chemistry Paper 2 Higher, Q06.4 (2 marks): Describe how a reversible chemical reaction is able to reach equilibrium. [2 marks]
  21. June 2022, Chemistry Paper 2 Higher, Q06.5 (2 marks): Explain the effect of increasing the pressure on the yield of ammonia. [2 marks]
  22. June 2022, Chemistry Paper 2 Higher, Q06.6 (2 marks): The forward reaction to produce ammonia is exothermic. Explain the effect of increasing the temperature on the yield of ammonia. [2 marks]
  23. June 2022, Chemistry Paper 2 Foundation, Q03.1 (1 mark): One product is ammonia. What is the name of the product with the formula HCl? [1 mark]
  24. June 2022, Chemistry Paper 2 Foundation, Q03.3 (1 mark): How does the equation show that the reaction is reversible? [1 mark]
  25. June 2022, Chemistry Paper 2 Foundation, Q03.4 (1 mark): Complete the sentence. [1 mark] The forward reaction is endothermic, so the reverse reaction is .
  26. June 2022, Chemistry Paper 2 Foundation, Q03.5 (1 mark): Complete the sentence. Choose the answer from the box. [1 mark] concentration rate temperature Equilibrium is reached when the forward and reverse reactions hap
  27. November 2021, Chemistry Paper 2 Higher, Q03.1 (3 marks): Suggest how copper sulfate can be used as a test for the presence of water. [3 marks]
  28. November 2021, Chemistry Paper 2 Higher, Q06.3 (2 marks): The reaction reaches equilibrium. Explain how an equilibrium is reached. [2 marks]
  29. November 2021, Chemistry Paper 2 Higher, Q06.4 (2 marks): Suggest how the catalyst affects the equilibrium position. Give one reason for your answer. [2 marks]
  30. November 2021, Chemistry Paper 2 Higher, Q06.5 (1 mark): What is the effect of increasing the pressure on the reaction to produce ammonia? [1 mark] Tick () one box. The yield of ammonia decreases. The yield of ammoni
  31. November 2021, Chemistry Paper 2 Higher, Q06.6 (2 marks): The forward reaction is exothermic. Explain the effect of increasing the temperature on the yield of ammonia gas produced at equilibrium. [2 marks]
  32. November 2021, Chemistry Paper 2 Foundation, Q01.1 (1 mark): How does the equation show that the reaction is reversible? [1 mark]
  33. November 2021, Chemistry Paper 2 Foundation, Q01.2 (2 marks): Complete the sentences. Choose answers from the box. [2 marks] blue green orange white yellow The colour of anhydrous copper sulfate is . The colour of hydrated
  34. November 2021, Chemistry Paper 2 Foundation, Q01.3 (1 mark): Figure 1 shows anhydrous copper sulfate in a sealed container. Figure 1 Suggest one reason why anhydrous copper sulfate is kept in a sealed container. [1 mark]
  35. November 2020, Chemistry Paper 2 Higher, Q07.1 (2 marks): Describe how a reaction reaches equilibrium. [2 marks] Nitrogen dioxide gas reacts to form dinitrogen tetraoxide gas. The reaction is reversible. The equation f
  36. November 2020, Chemistry Paper 2 Higher, Q07.2 (2 marks): Explain the effect on the equilibrium position of increasing the pressure. [2 marks]
  37. November 2020, Chemistry Paper 2 Higher, Q07.3 (3 marks): Figure 7 shows the change in the percentage of dinitrogen tetroxide (N2O4) in the equilibrium mixture as the temperature of the equilibrium mixture is changed.
  38. June 2019, Chemistry Paper 2 Higher, Q06.2 (2 marks): The reaction between oxygen and sulfur dioxide is at equilibrium. O2(g) + 2 SO2(g) ⇌ 2 SO3(g) Some of the sulfur trioxide (SO3) is removed. Explain what happens
  39. June 2018, Chemistry Paper 2 Higher, Q06.2 (2 marks): Explain why equilibrium is reached in this reaction. [2 marks]
  40. June 2018, Chemistry Paper 2 Higher, Q06.3 (4 marks): The stopper in Figure 8 is removed and hydrochloric acid is added. The stopper is replaced. Explain what happens to the equilibrium. [4 marks]
  41. June 2018, Chemistry Paper 2 Higher, Q06.4 (2 marks): Predict the effect of increasing the temperature on the amount of chlorine gas produced at equilibrium. Explain your answer using Le Chatelier’s Principle. [2 m
  42. June 2018, Chemistry Paper 2 Higher, Q06.5 (2 marks): Explain the effect of increasing the pressure on this equilibrium. [2 marks] Copyright information For confidentiality purposes, from the November 2015 examinat

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