plumiStandard enthalpy change definitions: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 6.1.2 Standard enthalpy change definitions, 2019–2025, with mark schemes and examiner’s reports where available.
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Q21(b)
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All 20 questions on Standard enthalpy change definitions, as a list
- January 2025, AS Unit 2, Q21(b) (1 mark): A Hess cycle for the reaction is shown. –164.3 kJ mol–1 CH4(g) + ½O=O(g) CH3OH(l) –74.8 kJ mol–1 0.0 kJ mol–1 –239.1 kJ mol–1 C(s) + 2H2(g) + ½O2(g) State why t
- October 2024, AS Unit 2, Q3 (1 mark): Which equation shows the reaction that occurs when the standard enthalpy change of formation of copper(II) carbonate is measured? A Cu(s) + C(s) + 3O(g) → CuCO3
- June 2024, AS Unit 3, Q4(e)(ii) (1 mark): State why the number of moles of sodium hydroxide and not the number of moles of sulfuric acid is used in the calculation for this experiment. (1)
- June 2024 (R), AS Unit 2, Q7 (1 mark): Which equation shows the reaction that occurs when the standard enthalpy change of atomisation of iodine is measured? A I2(s) → 2I(g) B ½I2(s) → I(g) C I2(g) →
- January 2024, AS Unit 2, Q22(a) (2 marks): Explain why ΔrH1 can also be described as an enthalpy change of formation. (2)
- October 2023, AS Unit 2, Q3 (1 mark): The standard enthalpy changes of combustion for a series of alkanes are shown. ΔcH d / kJ mol–1 Alkane formula C2H6(g) –1560 C3H8(g) –2219 C4H10(l) –2877 C5H12(
- October 2023, AS Unit 2, Q18(a)(ii) (2 marks): State what is meant by standard enthalpy change of neutralisation, ΔneutH d. (2)
- January 2023, AS Unit 2, Q2 (1 mark): Which equation represents the standard enthalpy change of atomisation, ΔatH , of bromine? A ½Br2(l) → Br(g) B ½Br2(g) → Br(g) → 2Br(g) C Br2(l) D Br2(g) → 2Br(g
- October 2022, AS Unit 2, Q2 (1 mark): Which equation shows the standard enthalpy change of formation of sodium chloride? A Na(s) + ½Cl2(g) → NaCl(s) B 2Na(s) + Cl2(g) → 2NaCl(s) → NaCl(s) C Na(g) +
- June 2022, AS Unit 2, Q1 (1 mark): Which equation represents the standard enthalpy change of formation, ΔfH d, for aluminium oxide? A 2Al(s) + 1½O2(g) → Al2O3(s) → Al2O3(s) B 2Al(s) + 3O(g) C 4Al
- June 2022, AS Unit 2, Q18(a)(i) (1 mark): State the two standard conditions for this enthalpy change. (1)
- January 2022, AS Unit 2, Q1 (1 mark): Which are correct for the reaction shown? CH3COOH + KOH → CH3COO−K+ + H2O ΔH = –55.8 kJ mol−1 Type of reaction Type of enthalpy change A endothermic formation B
- January 2022, AS Unit 2, Q2 (1 mark): Which equation does not represent a standard enthalpy change of atomisation? A Mg(s) → Mg(g) B Cl2(g) → 2Cl(g) C ½O2(g) → O(g) D Hg(l) → Hg(g) Use this space fo
- January 2022, AS Unit 2, Q21(b)(i) (1 mark): State why no ∆fH d value has been given for oxygen. (1)
- January 2022, Unit 4, Q1(a) (1 mark): The enthalpy change of atomisation of iodine (+107 kJ mol–1) is given by the equation (1) A ½I2(g) → I(g) B ½I2(s) → I(g) C I2(g) → 2I(g) D I2(s) → 2I(g)
- June 2021, AS Unit 2, Q2 (1 mark): The equation for a reaction is 2C(s) + O2(g) → 2CO(g) Which is the correct symbol for the enthalpy change for this reaction? A ΔatH B ΔcH C ΔfH D ΔrH
- October 2020, AS Unit 2, Q1 (1 mark): The bond enthalpy for the Cl Cl bond is +243.0 kJ mol–1. What is the enthalpy change of atomisation of chlorine in kJ mol–1? A +243.0 B –243.0 C +121.5 D –121.5
- October 2020, AS Unit 2, Q13(b)(ii) (2 marks): The increase in the value of ΔcH from butane to pentane is smaller than any other increase. Suggest an explanation for this. (2)
- January 2020, AS Unit 2, Q1 (1 mark): 9, of 1 Which equation represents the standard enthalpy change of formation, ǻfH hydrogen iodide? A H(g) + I(g) → HI(g) B H2(g) + I2(s) → 2HI(g) C ½H2(g) + ½I2(
- June 2019, AS Unit 2, Q11 (1 mark): Which equation represents the standard enthalpy change of atomisation of bromine? A Br2(g) → 2Br(g) B Br2(l) → 2Br(g) C ½Br2(l) → Br(g) D ½Br2(g) → Br(g) Use th
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