plumiBond enthalpy and mean bond enthalpy calculations: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 6.2.1 Bond enthalpy and mean bond enthalpy calculations, 2019–2025, with mark schemes and examiner’s reports where available.
All papers
All years
Q2(a)
The whole paper ↗Loading the question…
Open the full PDFYour answerQ16(a)(ii)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ21(a)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ21(c)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDFQ2(c)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ24(a)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ24(a)(ii)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDFQ19(a)(ii)
The whole paper ↗Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ20(a)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ20(a)(ii)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ18(c)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ21(a)(ii)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ19(b)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ19(b)(ii)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDF
All 24 questions on Bond enthalpy and mean bond enthalpy calculations, as a list
- June 2025, AS Unit 2, Q2(a) (1 mark): Methane burns to produce carbon dioxide and water vapour. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = –810 kJ mol–1 Some bond enthalpy data are shown. Bond enthalpy
- June 2025, Unit 5, Q16(a)(ii) (2 marks): Calculate the mean carbon-carbon bond enthalpy in benzene, using your completed cycle and the data shown. (2) C6H6(l) ΔfH = +49.0 kJ mol C(s) → C(g) ΔatH = +715
- January 2025, AS Unit 2, Q21(a) (3 marks): Calculate the enthalpy change per mole of methanol produced, using the bond enthalpies shown. H H H ⇋ + 2 2 H C H O O C H H O H Bond Enthalpy / kJ mol–1 O O 498
- January 2025, AS Unit 2, Q21(c) (2 marks): The standard enthalpy change of reaction to form methanol from methane calculated in part (a) is less accurate than the value given in the Hess cycle in part (b
- October 2024, AS Unit 2, Q2(c) (1 mark): Some bond enthalpies are shown. Bond enthalpy / kJ mol–1 Bond H H 436 C O 1077 O H 464 What is the bond enthalpy, in kJ mol–1, of the C H bond? (1) A 198 B 313
- June 2024, AS Unit 2, Q3 (1 mark): Which equation represents the reaction for which the enthalpy change, ΔrH, is the mean bond enthalpy of the C Cl bond in CCl4? A CCl4(g) → C(g) + 4Cl(g) B ¼CCl4
- June 2024 (R), AS Unit 2, Q4 (1 mark): Nitrogen reacts with hydrogen to form ammonia. ½N2(g) + 1½H2(g) NH3(g) ∆fH = –46 kJ mol–1 Bond Bond enthalpy / kJ mol–1 H H 436 N N 945 What is the bond entha
- January 2024, AS Unit 2, Q24(a)(i) (3 marks): Calculate the mean bond enthalpy, in kJ mol–1, for a single S F bond. (3)
- January 2024, AS Unit 2, Q24(a)(ii) (2 marks): Give two reasons why your answer to (a)(i) is unlikely to accurately represent the true S F bond enthalpy in SF6 . (2)
- January 2024, Unit 4, Q19(a)(ii) (2 marks): The standard enthalpy change, ΔrH d, for this reaction is close to, but not exactly zero. Explain this statement by considering the type and number of bonds bei
- October 2023, AS Unit 2, Q1 (1 mark): The mean C–F bond enthalpy is +485 kJ mol–1. Which process has an enthalpy change of +1940 kJ mol–1? A C(g) + 4F(g) → CF4(g) B C(s) + 2F2(g) → CF4(g) C CF4(g) →
- June 2023, AS Unit 2, Q20(a)(i) (4 marks): Use mean bond enthalpies to calculate a value for the enthalpy change of combustion of octane. (4) Bond C C C H O H O O C O Mean bond enthalpy 347 413 464 498 8
- June 2023, AS Unit 2, Q20(a)(ii) (2 marks): The standard enthalpy change of combustion, ΔcH , of octane is –5470 kJ mol–1. Give two reasons why this value, measured under standard conditions, is different
- January 2023, AS Unit 2, Q3 (1 mark): The enthalpy change of reaction, ΔrH , for the equation shown can be calculated using bond enthalpy data. ½H2(g) + ½Cl2(g) → HCl(g) Bond enthalpy / kJ mol–1 Bon
- October 2022, AS Unit 2, Q1 (1 mark): Hydrogen reacts with oxygen to form steam. H2(g) + ½O2(g) → H2O(g) ∆H = −242 kJ mol−1 Bond enthalpy / kJ mol−1 Bond H H 436 O O 498 What is the bond enthalpy of
- June 2022, AS Unit 2, Q18(c) (3 marks): The enthalpy changes for the conversion of four compounds in the gas phase into their constituent atoms are shown. H2O(g) → 2H(g) + O(g) ΔrH = +928 kJ mol−1 CH4
- January 2022, AS Unit 2, Q4 (1 mark): The equation for the complete combustion of methanal is shown. O O → O ΔH = –591 kJ mol−1 C + O C O + O H H H H Some bond enthalpy data are shown. Bond enthalpy
- January 2022, Unit 4, Q21(a)(ii) (2 marks): The enthalpy change for this reaction is small. Explain, by reference to the type and number of bonds being broken and made, how this might have been predicted.
- October 2021, AS Unit 2, Q19(b)(i) (2 marks): Give the meaning of the term ‘mean bond enthalpy’. (2)
- October 2021, AS Unit 2, Q19(b)(ii) (3 marks): Calculate a value for the enthalpy change of combustion of methanol, using the information in the table and the equation shown. (3) CH3OH + 1½O2 ® CO2 + 2H2O C–
- 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)(i) (2 marks): Explain why the increases in the values of ΔcH are similar. (2)
- January 2020, AS Unit 2, Q3 (1 mark): Nitrogen reacts with hydrogen to form ammonia. N2(g) + 3H2(g) U 2NH3(g) ǻrH = −92 kJ mol−1 Bond energy / kJ mol−1 Bond N N 945 H H 436 What is the mean bond ene
- June 2019, AS Unit 2, Q10 (1 mark): Chlorine reacts with ethane to form chloroethane and hydrogen chloride. Cl2 + C2H6 → C2H5Cl + HCl Bond enthalpy Bond / kJ mol–1 C—Cl 346 C—H 413 Cl—Cl 243 H—Cl
Questions, mark schemes and examiner’s reports are © Pearson Edexcel, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Edexcel International A Level Chemistry past papers.
The Plumi iPad app also offers exam-style questions with AI feedback on your handwritten working.