Skip to content
Android waitlistTry on iPad

Energetics: OCR GCSE Combined Science A questions

Every OCR GCSE Combined Science A exam question on C3.2 Energetics, 2018–2025, with its mark scheme and examiner’s report.

Paper
All papers
Exam
All years
Calculations

3,411 questions

  1. Q12(a)

    June 2025 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  2. Q12(b)

    June 2025 · Chemistry Paper 3 Foundation

    2 marksC3.2 Energetics
    The whole paper ↗

  3. Q12(c)(i)

    June 2025 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  4. Q12(c)(ii)

    June 2025 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  5. Q13

    June 2025 · Chemistry Paper 9 Higher

    6 marksC3.2 Energetics
    The whole paper ↗

  6. Q14(c)(i)

    June 2025 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  7. Q14(c)(ii)

    June 2025 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  8. Q14(c)(iii)

    June 2025 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  9. Q6

    June 2024 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗
    Your answer

  10. Q9

    June 2024 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗
    Your answer

  11. Q14(e)(i)

    June 2023 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  12. Q14(e)(ii)

    June 2023 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  13. Q14(e)(iii)

    June 2023 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗

  14. Q14(f)

    June 2023 · Chemistry Paper 3 Foundation

    3 marksC3.2 Energetics
    The whole paper ↗

  15. Q4

    June 2023 · Chemistry Paper 4 Foundation

    1 markC3.2 Energetics
    The whole paper ↗
    Your answer

  16. Q16(a)(i)

    June 2023 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  17. Q16(a)(ii)

    June 2023 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  18. Q16(a)(iii)

    June 2023 · Chemistry Paper 9 Higher

    1 markC3.2 Energetics
    The whole paper ↗

  19. Q16(b)

    June 2023 · Chemistry Paper 9 Higher

    3 marksC3.2 Energetics
    The whole paper ↗

  20. Q3

    June 2022 · Chemistry Paper 3 Foundation

    1 markC3.2 Energetics
    The whole paper ↗
    Your answer
All 58 questions on Energetics, as a list
  1. June 2025, Chemistry Paper 3 Foundation, Q12(a) (1 mark): Complete the table by writing in the start temperature for Reaction 1. [1]
  2. June 2025, Chemistry Paper 3 Foundation, Q12(b) (2 marks): State and explain which reaction is exothermic and which is endothermic. Reaction 1 Reaction 2 [2]
  3. June 2025, Chemistry Paper 3 Foundation, Q12(c)(i) (1 mark): Which energy change, A, B or C, is the activation energy? [1]
  4. June 2025, Chemistry Paper 3 Foundation, Q12(c)(ii) (1 mark): Which energy change, A, B or C, is the energy change for the reaction? [1]
  5. June 2025, Chemistry Paper 9 Higher, Q13 (6 marks): 13* The boxes show three pieces of information about a reaction. 1 Heat 2 Temperature at start Final temperature of reaction (°C) of reaction (°C) 20 42 3 React
  6. June 2025, Chemistry Paper 9 Higher, Q14(c)(i) (1 mark): Calculate the total energy transferred to break all the bonds in the reactant. Energy transferred to break all the bonds = kJ / mol [1]
  7. June 2025, Chemistry Paper 9 Higher, Q14(c)(ii) (1 mark): Calculate the total energy transferred to make all the bonds in the products. Energy transferred when all the bonds are made = kJ / mol [1]
  8. June 2025, Chemistry Paper 9 Higher, Q14(c)(iii) (1 mark): Use your answers to parts (i) and (ii) to calculate the energy change for the reaction. Energy change = kJ / mol [1]
  9. June 2024, Chemistry Paper 3 Foundation, Q6 (1 mark): The energy change in a reaction is 30 000 J. What is the energy change in kJ? A 3 B 30 C 300 D 3000 Your answer [1]
  10. June 2024, Chemistry Paper 9 Higher, Q9 (1 mark): Magnesium reacts very slowly with oxygen at room temperature. When magnesium is heated in a Bunsen burner flame it burns very brightly after only a few seconds.
  11. June 2023, Chemistry Paper 3 Foundation, Q14(e)(i) (1 mark): Explain what is meant by an exothermic reaction. [1]
  12. June 2023, Chemistry Paper 3 Foundation, Q14(e)(ii) (1 mark): The diagram shows the reaction profile for the reaction. Reactants Energy Products Progress of reaction Label the activation energy on the diagram. [1]
  13. June 2023, Chemistry Paper 3 Foundation, Q14(e)(iii) (1 mark): Explain the term activation energy. [1]
  14. June 2023, Chemistry Paper 3 Foundation, Q14(f) (3 marks): The table shows the temperature changes in four reactions. The reaction between zinc and sulfuric acid is slightly exothermic. Which shows the reaction between
  15. June 2023, Chemistry Paper 4 Foundation, Q4 (1 mark): What is the temperature of the dilute hydrochloric acid shown in the diagram? 50 40 Dilute hydrochloric acid A 41 °C B 46 °C C 51 °C D 54 °C Your answer [1]
  16. June 2023, Chemistry Paper 9 Higher, Q16(a)(i) (1 mark): Calculate the total energy transferred to break all the bonds in the reactants. Energy transferred to break all the bonds = kJ / mol [1]
  17. June 2023, Chemistry Paper 9 Higher, Q16(a)(ii) (1 mark): Calculate the total energy transferred when all the bonds in the products are made. Energy transferred when all the bonds are made = kJ / mol [1]
  18. June 2023, Chemistry Paper 9 Higher, Q16(a)(iii) (1 mark): Use your answers to parts (i) and (ii) to calculate the energy change for the reaction. Energy change = kJ / mol [1]
  19. June 2023, Chemistry Paper 9 Higher, Q16(b) (3 marks): Complete the reaction profile for the exothermic reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3. Label the energy change in the reaction and t
  20. June 2022, Chemistry Paper 3 Foundation, Q3 (1 mark): The table shows the start and end temperatures of four different reactions. Reaction Start temperature (°C) End temperature (°C) A –3 9 B 14 37 C 20 16 D 23 23
  21. June 2022, Chemistry Paper 3 Foundation, Q7 (1 mark): The diagram shows the reaction profile for a reaction. X Z Energy Y Progress of reaction Which row represents the activation energy and the energy change for th
  22. June 2022, Chemistry Paper 9 Higher, Q8 (1 mark): The diagram shows the reaction of hydrogen, H2, and oxygen, O2, to make water, H2O. O H H H H + O O O H H H H The energy required to break all the H–H and O=O b
  23. November 2021, Chemistry Paper 3 Foundation, Q17(a)(i) (1 mark): How does a temperature change show that a reaction is endothermic? [1]
  24. November 2021, Chemistry Paper 3 Foundation, Q17(a)(ii) (1 mark): How should the student have written the temperature change to show that this reaction is endothermic? [1]
  25. November 2021, Chemistry Paper 3 Foundation, Q17(b) (2 marks): Describe how the student performed the experiment so that they could calculate the temperature change. [2]
  26. November 2021, Chemistry Paper 3 Foundation, Q17(c) (4 marks): The student repeats the experiment using a different mass of citric acid. This time the student measures a larger temperature change. The temperature change is
  27. November 2021, Chemistry Paper 3 Foundation, Q17(d) (3 marks): When the student washed out the plastic cup at the end of the second experiment they saw some excess solid left. Explain how this affected the student’s result
  28. November 2021, Chemistry Paper 4 Foundation, Q14(c)(iii) (1 mark): As water reacts with the white solid, the temperature of the boiling tube increases. What name is given to this type of reaction where heat is transferred to th
  29. November 2021, Chemistry Paper 9 Higher, Q11(a)(i) (1 mark): How does a temperature change show that a reaction is endothermic? [1]
  30. November 2021, Chemistry Paper 9 Higher, Q11(a)(ii) (1 mark): How should the student have written the temperature change to show that this reaction is endothermic? [1]
  31. November 2021, Chemistry Paper 9 Higher, Q11(b) (2 marks): Describe how the student performed the experiment so that they could calculate the temperature change. [2]
  32. November 2021, Chemistry Paper 9 Higher, Q11(c) (4 marks): The student repeats the experiment using a different mass of citric acid. This time the student measures a larger temperature change. The temperature change is
  33. November 2021, Chemistry Paper 9 Higher, Q11(d) (3 marks): When the student washed out the plastic cup at the end of the second experiment they saw some excess solid left. Explain how this affected the student’s result
  34. November 2021, Chemistry Paper 9 Higher, Q15(c) (3 marks): The equation shows the formation of 1 mole of carbon dioxide from carbon monoxide and oxygen. C O + O O O C O ½ The table shows the bond energies of some bonds.
  35. November 2021, Chemistry Paper 9 Higher, Q15(d)(i) (2 marks): Explain the term activation energy. [2]
  36. November 2021, Chemistry Paper 9 Higher, Q15(d)(ii) (1 mark): Look at your calculation in (c). Suggest a value for the activation energy for the formation of 1 mole of carbon dioxide in this reaction. [1]
  37. November 2020, Chemistry Paper 3 Foundation, Q12(a) (1 mark): What piece of equipment should the student use to measure an accurate volume of 25 cm3 of dilute hydrochloric acid? [1]
  38. November 2020, Chemistry Paper 3 Foundation, Q12(b) (1 mark): Look at Fig. 12.2. It shows part of the thermometer used to measure the temperature of the dilute hydrochloric acid at the start of the experiment. - 20 °C - 10
  39. November 2020, Chemistry Paper 3 Foundation, Q12(c)(i) (1 mark): [1]
  40. November 2020, Chemistry Paper 3 Foundation, Q12(c)(ii) (1 mark): Predict the result the student would obtain. [1]
  41. November 2020, Chemistry Paper 3 Foundation, Q12(d) (1 mark): Why was the temperature change measured by the student less than he expected? Tick (J) one box. Some heat escaped from the top of the polystyrene cup. The therm
  42. November 2020, Chemistry Paper 3 Foundation, Q12(e)(i) (1 mark): Describe how the reaction profile shows that this reaction is exothermic. [1]
  43. November 2020, Chemistry Paper 3 Foundation, Q12(e)(ii) (1 mark): What is meant by activation energy? [1]
  44. November 2020, Chemistry Paper 9 Higher, Q13(a) (2 marks): Look at Fig. 13.1. It shows the reaction profile for the reaction. Energy Progress of reaction Fig. 13.1 Complete Fig. 13.1 by filling in the two boxes. Use the
  45. November 2020, Chemistry Paper 9 Higher, Q13(b) (2 marks): Fig. 13.2 shows three energy changes, A, B and C, for a reaction. The energy released in the reaction is 102 kJ / mol. The activation energy for the reaction is
  46. June 2019, Chemistry Paper 3 Foundation, Q16(a) (2 marks): Which reaction, X, Y or Z, is endothermic? Explain your answer. [2]
  47. June 2019, Chemistry Paper 3 Foundation, Q16(b) (4 marks): Draw a labelled reaction profile for an endothermic reaction. Use the following labels on your reaction profile: • products • energy change • activation energy.
  48. June 2019, Chemistry Paper 3 Foundation, Q16(c) (2 marks): Another student repeats the same reactions. The student does the experiment in a polystyrene cup instead of a beaker. Explain why using a polystyrene cup is an
  49. June 2019, Chemistry Paper 9 Higher, Q8 (1 mark): The table shows bond energies. Bond energy Bond (kJ / mol) H–H 436 Cl–Cl 243 H–Cl 432 Hydrogen reacts with chlorine to form hydrogen chloride. H–H + Cl–Cl 2 H–C
  50. June 2019, Chemistry Paper 9 Higher, Q11(a) (2 marks): Which reaction, X, Y or Z, is endothermic? Explain your answer. [2]
  51. June 2019, Chemistry Paper 9 Higher, Q11(b) (4 marks): Draw a labelled reaction profile for an endothermic reaction. Use the following labels on your reaction profile: • products • energy change • activation energy.
  52. June 2019, Chemistry Paper 9 Higher, Q11(c) (2 marks): Another student repeats the same reactions. The student does the experiment in a polystyrene cup instead of a beaker. Explain why using a polystyrene cup is an
  53. June 2019, Chemistry Paper 10 Higher, Q16(c) (4 marks): Propane burns in oxygen to form carbon dioxide and water. H H H O H C C C H + 3 O C O + 4 H H 5 O O H H H The table shows some bond energies. Bond Bond energy (
  54. June 2018, Chemistry Paper 3 Foundation, Q10 (1 mark): The diagram shows a reaction profile. 350 300 Reactants 250 200 Energy (kJ / mol) Products 150 100 50 0 Progress of reaction What is the energy change of the re
  55. June 2018, Chemistry Paper 9 Higher, Q13(a)(i) (1 mark): Draw an arrow on the graph to show the activation energy. Label your arrow A. [1]
  56. June 2018, Chemistry Paper 9 Higher, Q13(a)(ii) (1 mark): Draw another arrow on the graph to show the overall energy change in the reaction. Label your arrow E. [1]
  57. June 2018, Chemistry Paper 9 Higher, Q13(b) (2 marks): The reaction in the graph is exothermic. Explain why. Use ideas about bonds. [2]
  58. June 2018, Chemistry Paper 9 Higher, Q13(c) (3 marks): Hydrogen burns in oxygen to form water. Look at the equation for the reaction. 2H2 + O2 → 2H2O Average Bond bond energy (kJ / mol) H – H 436 H – O 464 O = O 498

Questions, mark schemes and examiner’s reports are © OCR, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Full past papers.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.