plumiEnthalpy changes of solution and hydration: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.2.1.2 Enthalpy changes of solution and hydration, 2016–2025, with mark schemes and examiner’s reports where available.
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Q5(a)
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All 10 questions on Enthalpy changes of solution and hydration, as a list
- 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
- November 2021, Paper 1, Q16(c)(i) (1 mark): Explain what is meant by enthalpy change of solution. [1]
- 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]
- 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]
- 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) +
- 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]
- June 2019, Paper 3, Q5(a)(i) (6 marks): The enthalpy change of reaction, ∆rH, for converting anhydrous copper(II) sulfate to hydrated copper(II) sulfate is difficult to measure directly by experiment.
- June 2018, Paper 1, Q16(a)(i) (2 marks): Explain what is meant by the term enthalpy change of hydration. [2]
- 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
- 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]
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