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Reversible reactions and equilibrium past paper questions

O Level Chemistry 5070 · Chemical reactions. 1 State that some chemical reactions are reversible as shown by the symbol ⇌ 2 Describe how changing the conditions can change the direction of a reversible reaction for: (a) the effect of heat on hydrated compounds (b) the addition of water to anhydrous compounds including copper(II) sulfate and cobalt(II) chloride 3 State that a reversible reaction in a closed system is at equilibrium when: (a) the rate of the forward reaction is equal to the rate of the reverse reaction (b) the concentrations of reactants and products are no longer changing 4 Predict and explain, for a reversible reaction, how the position of equilibrium is affected by: (a) changing temperature (b) changing pressure (c) changing concentration (d) using a catalyst using information provided 5 State the symbol equation for the production of ammonia in the Haber process, N2(g) + 3H2(g) ⇌ 2NH3(g) 6 State the sources of th

In Cambridge O Level Chemistry 5070, Reversible reactions and equilibrium came up in 46 of the 72 papers on Paperstreak, for about 3 marks a paper when it does. It last came up in October/November 2025.

Often set with Formulae, The mole and the Avogadro constant, Rate of reaction, The characteristic properties of acids and bases.

70 questions, newest first

  1. 5070/11/O/N/25 Question 16 · 1 mark
  2. 5070/12/O/N/25 Question 17 · 1 mark
  3. 5070/21/O/N/25 Question 7 part (b(ii)) · 2 marks
  4. 5070/22/O/N/25 Question 5 part (e) · 2 marks
  5. 5070/11/M/J/25 Question 18 · 1 mark
  6. 5070/11/M/J/25 Question 19 · 1 mark
  7. 5070/12/M/J/25 Question 19 · 1 mark
  8. 5070/21/M/J/25 Question 6 part (d(i)) · 2 marks
  9. 5070/22/M/J/25 Question 6 parts (d(i)) (d(ii)) · 4 marks
  10. 5070/11/O/N/24 Question 16 · 1 mark
  11. 5070/11/O/N/24 Question 17 · 1 mark
  12. 5070/12/O/N/24 Question 18 · 1 mark
  13. 5070/12/O/N/24 Question 19 · 1 mark
  14. 5070/21/O/N/24 Question 2 parts (e(i)) (e(ii)) · 4 marks
  15. 5070/22/O/N/24 Question 2 part (e) · 2 marks
  16. 5070/11/M/J/24 Question 19 · 1 mark
  17. 5070/11/M/J/24 Question 20 · 1 mark
  18. 5070/12/M/J/24 Question 18 · 1 mark
  19. 5070/12/M/J/24 Question 19 · 1 mark
  20. 5070/21/M/J/24 Question 1 part (c) · 1 mark
  21. 5070/21/M/J/24 Question 5 parts (a) (b) · 4 marks
  22. 5070/22/M/J/24 Question 5 parts (a) (b) · 4 marks
  23. 5070/11/O/N/23 Question 18 · 1 mark
  24. 5070/21/O/N/23 Question 2 part (f(ii)) · 1 mark
  25. 5070/21/O/N/23 Question 6 part (a(ii)) · 1 mark
  26. 5070/21/O/N/23 Question 8 parts (a(i)) (a(ii)) · 3 marks
  27. 5070/22/O/N/23 Question 8 parts (a(i)) (a(ii)) · 3 marks
  28. 5070/11/M/J/23 Question 15 · 1 mark
  29. 5070/11/M/J/23 Question 16 · 1 mark
  30. 5070/12/M/J/23 Question 17 · 1 mark
  31. 5070/12/M/J/23 Question 18 · 1 mark
  32. 5070/21/M/J/23 Question 5 parts (a(i)) (a(ii)) (a(iii)) · 6 marks
  33. 5070/22/M/J/23 Question 5 parts (a(i)) (a(ii)) (a(iii)) · 5 marks
  34. 5070/11/O/N/22 Question 26 · 1 mark
  35. 5070/11/O/N/22 Question 32 · 1 mark
  36. 5070/12/O/N/22 Question 26 · 1 mark
  37. 5070/12/O/N/22 Question 31 · 1 mark
  38. 5070/21/O/N/22 Question 4 part (a(i)) · 1 mark
  39. 5070/21/O/N/22 Question 6 parts (a(i)) (a(ii)) · 4 marks
  40. 5070/22/O/N/22 Question 6 parts (b(i)) (b(ii)) · 4 marks
  41. 5070/22/O/N/22 Question 8 part (e(ii)) · 1 mark
  42. 5070/11/M/J/22 Question 22 · 1 mark
  43. 5070/12/M/J/22 Question 22 · 1 mark
  44. 5070/12/M/J/22 Question 25 · 1 mark
  45. 5070/12/M/J/22 Question 29 · 1 mark
  46. 5070/21/M/J/22 Question 5 parts (a(i)) (a(ii)) · 4 marks
  47. 5070/21/M/J/22 Question 9 part (a) · 2 marks
  48. 5070/22/M/J/22 Question 5 parts (a(i)) (a(ii)) · 4 marks
  49. 5070/11/O/N/21 Question 21 · 1 mark
  50. 5070/12/O/N/21 Question 21 · 1 mark
  51. 5070/12/O/N/21 Question 25 · 1 mark
  52. 5070/21/O/N/21 Question 7 parts (d(i)) (d(ii)) · 4 marks
  53. 5070/21/O/N/21 Question 9 part (a) · 2 marks
  54. 5070/22/O/N/21 Question 7 parts (d(i)) (d(ii)) · 4 marks
  55. 5070/11/M/J/21 Question 21 · 1 mark
  56. 5070/11/M/J/21 Question 25 · 1 mark
  57. 5070/12/M/J/21 Question 21 · 1 mark
  58. 5070/21/M/J/21 Question 6 parts (d(i)) (d(ii)) · 4 marks
  59. 5070/22/M/J/21 Question 5 part (c) · 3 marks
  60. 5070/22/M/J/21 Question 9 parts (c(ii)) (c(iii)) · 3 marks
  61. 5070/11/O/N/20 Question 22 · 1 mark
  62. 5070/11/O/N/20 Question 25 · 1 mark
  63. 5070/12/O/N/20 Question 22 · 1 mark
  64. 5070/12/O/N/20 Question 25 · 1 mark
  65. 5070/21/O/N/20 Question 5 part (b(ii)) · 2 marks
  66. 5070/21/O/N/20 Question 9 parts (c(i)) (c(ii)) · 4 marks
  67. 5070/22/O/N/20 Question 9 parts (c(i)) (c(ii)) · 4 marks
  68. 5070/12/M/J/20 Question 23 · 1 mark
  69. 5070/21/M/J/20 Question 4 part (e(iii)) · 2 marks
  70. 5070/22/M/J/20 Question 3 part (d(iii)) · 2 marks

More in Chemical reactions: Physical and chemical changes, Rate of reaction, Redox.

Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.