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Enthalpy changes for solids and solutions: WJEC A‑Level Chemistry questions

Every WJEC A-Level Chemistry exam question on 3.6 Enthalpy changes for solids and solutions, 2016–2025, with its mark scheme and examiner’s report.

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1,204 questions

  1. Q1(a)

    Summer 2024 · Unit 3

    1 mark3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2024 Unit 3, question 1(a): Write an equation, including state symbols, that represents the enthalpy change of lattice formation of solid magnesium chloride. [1]

  2. Q1(b)

    Summer 2024 · Unit 3

    1 mark3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2024 Unit 3, question 1(b): Complete the following equation: [1] standard enthalpy standard enthalpy = – change of solution change of lattice formation

  3. Q2

    Summer 2023 · Unit 3

    2 marks3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2023 Unit 3, question 2: Use the data shown to explain why silver chloride is insoluble in water. [2] Enthalpy / kJ mol−1 Standard enthalpy of hydration for Ag+ −464 Standard enthalpy o

  4. Q8(b)(i)

    Summer 2022 · Unit 3

    1 mark3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2022 Unit 3, question 8(b)(i): State the enthalpy of atomisation of chlorine. [1]

  5. Q8(b)(ii)

    Summer 2022 · Unit 3

    3 marks3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2022 Unit 3, question 8(b)(ii): Use the standard enthalpy changes to find the standard enthalpy change of lattice formation of sodium chloride. [3] Standard enthalpy change of lattice formatio

  6. Q9(a)(i)

    Summer 2019 · Unit 3

    1 mark3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2019 Unit 3, question 9(a)(i): Give the value of the standard enthalpy change of atomisation of chlorine. [1] kJ mol–1

  7. Q9(a)(ii)

    Summer 2019 · Unit 3

    2 marks3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2019 Unit 3, question 9(a)(ii): Calculate the standard enthalpy of lattice formation of CaCl2. [2] Δlatt formH θ = kJ mol–1

  8. Q9(a)(iii)

    Summer 2019 · Unit 3

    2 marks3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2019 Unit 3, question 9(a)(iii): A student incorrectly states that the second ionisation energy of calcium is 1735 kJ mol–1 as this is the energy needed to form Ca2+(g) in the Born-Haber cycle.

  9. Q3

    Summer 2017 · Unit 3

    2 marks3.6 Enthalpy changes for solids and solutions
    The whole paper ↗
    Summer 2017 Unit 3, question 3: Calcium chloride, CaCl2, is soluble in water. Use the values below to explain why this is the case. [2] Ca2+(g) + 2Cl−(g) ΔHθ = −2237 kJ mol−1 Equation 1 CaCl2(
All 9 questions on Enthalpy changes for solids and solutions, as a list
  1. Summer 2024, Unit 3, Q1(a) (1 mark): Write an equation, including state symbols, that represents the enthalpy change of lattice formation of solid magnesium chloride. [1]
  2. Summer 2024, Unit 3, Q1(b) (1 mark): Complete the following equation: [1] standard enthalpy standard enthalpy = – change of solution change of lattice formation
  3. Summer 2023, Unit 3, Q2 (2 marks): Use the data shown to explain why silver chloride is insoluble in water. [2] Enthalpy / kJ mol−1 Standard enthalpy of hydration for Ag+ −464 Standard enthalpy o
  4. Summer 2022, Unit 3, Q8(b)(i) (1 mark): State the enthalpy of atomisation of chlorine. [1]
  5. Summer 2022, Unit 3, Q8(b)(ii) (3 marks): Use the standard enthalpy changes to find the standard enthalpy change of lattice formation of sodium chloride. [3] Standard enthalpy change of lattice formatio
  6. Summer 2019, Unit 3, Q9(a)(i) (1 mark): Give the value of the standard enthalpy change of atomisation of chlorine. [1] kJ mol–1
  7. Summer 2019, Unit 3, Q9(a)(ii) (2 marks): Calculate the standard enthalpy of lattice formation of CaCl2. [2] Δlatt formH θ = kJ mol–1
  8. Summer 2019, Unit 3, Q9(a)(iii) (2 marks): A student incorrectly states that the second ionisation energy of calcium is 1735 kJ mol–1 as this is the energy needed to form Ca2+(g) in the Born-Haber cycle.
  9. Summer 2017, Unit 3, Q3 (2 marks): Calcium chloride, CaCl2, is soluble in water. Use the values below to explain why this is the case. [2] Ca2+(g) + 2Cl−(g) ΔHθ = −2237 kJ mol−1 Equation 1 CaCl2(

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