plumiStorage cells and fuel cells: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.2.3.5 Storage cells and fuel cells, 2016–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ5(c)(i)
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Open the full PDFYour answerQ19(c)(i)
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All 12 questions on Storage cells and fuel cells, as a list
- June 2025, Paper 1, Q10 (1 mark): The overall equation for a hydrogen–oxygen fuel cell is: H2(g) + 1 2O2(g) H2O(l) The half-equation at the negative electrode is: H2(g) + 2OH–(aq) 2H2O(l) + 2e–
- June 2025, Paper 3, Q5(c)(i) (1 mark): What is the standard electrode potential of the negative electrode in this cell? Standard electrode potential = V [1]
- June 2025, Paper 3, Q5(c)(ii) (2 marks): Construct the equation for the reaction at the negative electrode of this cell. [2]
- June 2024, Paper 1, Q21(d)(i) (1 mark): A lithium-ion cell involves redox systems 1 and 5. Construct the overall cell equation for a lithium-ion cell. [1]
- June 2024, Paper 1, Q21(d)(ii) (3 marks): Hydrogen-oxygen fuel cells can operate in acidic or in alkaline conditions. Show that for acidic and alkaline hydrogen–oxygen fuel cells, the standard cell pote
- June 2023, Paper 1, Q12 (1 mark): The equations show the electrode potentials of the half-cells used in a lithium-ion cell. E ө / V Li+ + e– Li –3.04 Li+ + CoO2 + e– LiCoO2 +1.16 Which statement
- November 2021, Paper 1, Q19(c)(i) (1 mark): Write the half-equation at the negative electrode. [1]
- November 2021, Paper 1, Q19(c)(ii) (1 mark): The cell potential is 1.23 V. Calculate the electrode potential of the negative electrode. electrode potential = V [1]
- November 2021, Paper 1, Q19(c)(iii) (1 mark): State one important feature of a fuel cell that is different from a conventional storage cell. [1]
- November 2020, Paper 1, Q19(c) (2 marks): Methanoic acid, HCOOH, can be used in a fuel cell. As with all fuel cells, the fuel (HCOOH) is supplied at one electrode and the oxidant (oxygen) at the other e
- June 2019, Paper 1, Q15 (1 mark): Four redox systems relevant to hydrogen–oxygen fuel cells are shown below. Eө/V H2O(l) + e− OH−(aq) + ½H2(g) −0.83 H+(aq) + e− ½H2(g) 0.00 ½O2(g) + H2O(l) + 2e−
- June 2018, Paper 1, Q12 (1 mark): The redox equilibria for a hydrogen–oxygen fuel cell in alkaline solution are shown below. 2H2O(l) + 2e– H2(g) + 2OH–(aq) Eө = –0.83 V 1/2O2(g) + H2O(l) + 2e– 2
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