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Lattice enthalpy: OCR A‑Level Chemistry A questions

Every OCR A-Level Chemistry A exam question on 5.2.1 Lattice enthalpy, 2016–2025, with its mark scheme and examiner’s report.

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1,820 questions

  1. Q3

    June 2025 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2025 Paper 1, question 3: The diagram shows the Born-Haber cycle for sodium oxide, Na2O. 2Na+(g) + O2–(g) 2Na+(g) + O(g) + 2e– 2Na+(g) + O–(g) + e– 2Na(g) + O(g) 2Na(g) + ½O2(g) 2Na(s) +

  2. Q16(c)(i)

    June 2024 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2024 Paper 1, question 16(c)(i): Define the term lattice enthalpy. [2]

  3. Q16(c)(ii)

    June 2024 · Paper 1

    3 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2024 Paper 1, question 16(c)(ii): The diagram shows an incomplete Born-Haber cycle that can be used to determine the lattice enthalpy of MnO. Mn2+(g) + O(g) + 2e– Mn2+(g) + O2–(g) 1 Mn2+(g) + O2

  4. Q16(c)(iii)

    June 2024 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2024 Paper 1, question 16(c)(iii): Calculate the lattice enthalpy of MnO. lattice enthalpy = kJ mol–1 [2]

  5. Q8

    June 2023 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2023 Paper 1, question 8: Which compound requires the most energy to convert one mole into its gaseous ions? A NaF B Na2O C MgF2 D MgO Your answer [1]

  6. Q16(a)(i)

    June 2023 · Paper 1

    4 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2023 Paper 1, question 16(a)(i): The diagram below shows an incomplete Born-Haber cycle that can be used to calculate the lattice enthalpy of barium iodide. On the dotted lines, add the species

  7. Q16(a)(ii)

    June 2023 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2023 Paper 1, question 16(a)(ii): Calculate the lattice enthalpy of barium iodide. lattice enthalpy = kJ mol–1 [2]

  8. Q9

    June 2022 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2022 Paper 1, question 9: Which equation represents the change that accompanies the standard enthalpy change of atomisation of bromine? A ½ Br2(l) Br(g) B Br2(l) 2Br(g) C ½ Br2(g) Br(g)

  9. Q5(a)

    June 2022 · Paper 3

    6 marks5.2.1 Lattice enthalpy3.2.1 Enthalpy changes
    The whole paper ↗
    June 2022 Paper 3, question 5(a): This question is about energy changes. (a)* A student plans to determine the enthalpy change of hydration of calcium ions. The student finds the information bel

  10. Q16(c)(i)

    November 2021 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2021 Paper 1, question 16(c)(i): Explain what is meant by enthalpy change of solution. [1]

  11. Q16(c)(ii)

    November 2021 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2021 Paper 1, question 16(c)(ii): On the dotted lines, add the species present, including state symbols. Mg2+(g) + 2F–(g) MgF2(s) [2]

  12. Q16(c)(iii)

    November 2021 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2021 Paper 1, question 16(c)(iii): Calculate the enthalpy change of solution of MgF2. enthalpy change of solution = kJ mol–1 [1]

  13. Q16(c)(iv)

    November 2021 · Paper 1

    4 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2021 Paper 1, question 16(c)(iv): The enthalpy changes of solution of the magnesium halides show a trend from MgF2 to MgI2. Explain why it is difficult to predict whether the enthalpy change of

  14. Q16(d)(i)

    November 2020 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2020 Paper 1, question 16(d)(i): An incomplete energy cycle based on Table 16.2 is shown below. On the dotted lines, add the species present, including state symbols. Mg2+(g) + 2Br–(g) Mg+(g) +

  15. Q16(d)(ii)

    November 2020 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2020 Paper 1, question 16(d)(ii): Using your completed energy cycle in 16(d)(i), calculate the enthalpy change of hydration of bromide ions. enthalpy change of hydration = kJ mol−1 [2]

  16. Q16(d)(iii)

    November 2020 · Paper 1

    3 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    November 2020 Paper 1, question 16(d)(iii): Write the equation for the lattice enthalpy of magnesium bromide and calculate the lattice enthalpy of magnesium bromide. Equation Calculation lattice enthalpy

  17. Q16(d)(i)

    June 2019 · Paper 1

    4 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2019 Paper 1, question 16(d)(i): The incomplete Born–Haber cycle below can be used to determine the lattice enthalpy of potassium oxide. In the boxes, complete the species present in the cycle.

  18. Q16(d)(ii)

    June 2019 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2019 Paper 1, question 16(d)(ii): Calculate the lattice enthalpy of potassium oxide. lattice enthalpy = kJ mol−1 [2]

  19. Q16(e)(ii)

    June 2019 · Paper 1

    2 marks5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2019 Paper 1, question 16(e)(ii): The lattice enthalpy of sodium oxide is more exothermic than that of potassium oxide. Explain why. [2]

  20. Q13

    June 2018 · Paper 1

    1 mark5.2.1 Lattice enthalpy
    The whole paper ↗
    June 2018 Paper 1, question 13: Which enthalpy change(s) is/are endothermic? 1 The bond enthalpy of the C–H bond 2 The second electron affinity of oxygen 3 The standard enthalpy change of form
All 24 questions on Lattice enthalpy, as a list
  1. June 2025, Paper 1, Q3 (1 mark): The diagram shows the Born-Haber cycle for sodium oxide, Na2O. 2Na+(g) + O2–(g) 2Na+(g) + O(g) + 2e– 2Na+(g) + O–(g) + e– 2Na(g) + O(g) 2Na(g) + ½O2(g) 2Na(s) +
  2. June 2024, Paper 1, Q16(c)(i) (2 marks): Define the term lattice enthalpy. [2]
  3. June 2024, Paper 1, Q16(c)(ii) (3 marks): The diagram shows an incomplete Born-Haber cycle that can be used to determine the lattice enthalpy of MnO. Mn2+(g) + O(g) + 2e– Mn2+(g) + O2–(g) 1 Mn2+(g) + O2
  4. June 2024, Paper 1, Q16(c)(iii) (2 marks): Calculate the lattice enthalpy of MnO. lattice enthalpy = kJ mol–1 [2]
  5. June 2023, Paper 1, Q8 (1 mark): Which compound requires the most energy to convert one mole into its gaseous ions? A NaF B Na2O C MgF2 D MgO Your answer [1]
  6. June 2023, Paper 1, Q16(a)(i) (4 marks): The diagram below shows an incomplete Born-Haber cycle that can be used to calculate the lattice enthalpy of barium iodide. On the dotted lines, add the species
  7. June 2023, Paper 1, Q16(a)(ii) (2 marks): Calculate the lattice enthalpy of barium iodide. lattice enthalpy = kJ mol–1 [2]
  8. June 2022, Paper 1, Q9 (1 mark): Which equation represents the change that accompanies the standard enthalpy change of atomisation of bromine? A ½ Br2(l) Br(g) B Br2(l) 2Br(g) C ½ Br2(g) Br(g)
  9. June 2022, Paper 3, Q5(a) (6 marks): This question is about energy changes. (a)* A student plans to determine the enthalpy change of hydration of calcium ions. The student finds the information bel
  10. November 2021, Paper 1, Q16(c)(i) (1 mark): Explain what is meant by enthalpy change of solution. [1]
  11. November 2021, Paper 1, Q16(c)(ii) (2 marks): On the dotted lines, add the species present, including state symbols. Mg2+(g) + 2F–(g) MgF2(s) [2]
  12. November 2021, Paper 1, Q16(c)(iii) (1 mark): Calculate the enthalpy change of solution of MgF2. enthalpy change of solution = kJ mol–1 [1]
  13. November 2021, Paper 1, Q16(c)(iv) (4 marks): The enthalpy changes of solution of the magnesium halides show a trend from MgF2 to MgI2. Explain why it is difficult to predict whether the enthalpy change of
  14. November 2020, Paper 1, Q16(d)(i) (2 marks): An incomplete energy cycle based on Table 16.2 is shown below. On the dotted lines, add the species present, including state symbols. Mg2+(g) + 2Br–(g) Mg+(g) +
  15. November 2020, Paper 1, Q16(d)(ii) (2 marks): Using your completed energy cycle in 16(d)(i), calculate the enthalpy change of hydration of bromide ions. enthalpy change of hydration = kJ mol−1 [2]
  16. November 2020, Paper 1, Q16(d)(iii) (3 marks): Write the equation for the lattice enthalpy of magnesium bromide and calculate the lattice enthalpy of magnesium bromide. Equation Calculation lattice enthalpy
  17. June 2019, Paper 1, Q16(d)(i) (4 marks): The incomplete Born–Haber cycle below can be used to determine the lattice enthalpy of potassium oxide. In the boxes, complete the species present in the cycle.
  18. June 2019, Paper 1, Q16(d)(ii) (2 marks): Calculate the lattice enthalpy of potassium oxide. lattice enthalpy = kJ mol−1 [2]
  19. June 2019, Paper 1, Q16(e)(ii) (2 marks): The lattice enthalpy of sodium oxide is more exothermic than that of potassium oxide. Explain why. [2]
  20. June 2018, Paper 1, Q13 (1 mark): Which enthalpy change(s) is/are endothermic? 1 The bond enthalpy of the C–H bond 2 The second electron affinity of oxygen 3 The standard enthalpy change of form
  21. June 2018, Paper 1, Q16(a)(i) (2 marks): Explain what is meant by the term enthalpy change of hydration. [2]
  22. June 2018, Paper 1, Q16(a)(ii) (4 marks): The enthalpy change of hydration of F– can be determined using the enthalpy changes in Table 16.1 and the incomplete energy cycle below. On the dotted lines, ad
  23. June 2018, Paper 1, Q16(a)(iii) (2 marks): Calculate the enthalpy change of hydration of fluoride ions, F–. enthalpy change of hydration = kJ mol–1 [2]
  24. June 2018, Paper 1, Q16(a)(iv) (2 marks): Predict how the enthalpy changes of hydration of F– and Cl– would differ. Explain your answer. [2]

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