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Exothermic and endothermic reactions past paper questions

O Level Chemistry 5070 · Chemical energetics. 1 State that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings 2 State that an endothermic reaction takes in thermal energy from the surroundings leading to a decrease in the temperature of the surroundings 3 State that the transfer of thermal energy during a reaction is called the enthalpy change, ΔH, of the reaction. ΔH is negative for exothermic reactions and positive for endothermic reactions 4 Define activation energy, Ea, as the minimum energy that colliding particles must have to react 5 Draw, label and interpret reaction pathway diagrams for exothermic and endothermic reactions using information provided, to include: (a) reactants (b) products (c) enthalpy change of the reaction, ΔH (d) activation energy, Ea 6 State that bond breaking is an endothermic process and bond making is an exothermic process

In Cambridge O Level Chemistry 5070, Exothermic and endothermic reactions came up in 56 of the 72 papers on Paperstreak, for about 4 marks a paper when it does. It last came up in October/November 2025.

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

70 questions, newest first

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

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