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Electrochemical cells, cell emf and cell diagrams (Core Practical 12): Edexcel International A Level Chemistry questions

Edexcel International A Level Chemistry past-paper questions on 16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12), 2019–2025, with mark schemes and examiner’s reports where available.

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  1. Q14(a)

    June 2025 · Unit 5

    2 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  2. Q14(b)

    June 2025 · Unit 5

    2 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  3. Q14(c)

    June 2025 · Unit 5

    2 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  4. Q14(d)

    June 2025 · Unit 5

    3 marks16.1.3 Predicting feasibility from electrode potentials16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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    The start of question 14

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  5. Q1(a)

    June 2025 (A) · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  6. Q18(a)(i)

    January 2025 · Unit 5

    4 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  7. Q18(a)(ii)

    January 2025 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  8. Q17(a)

    October 2024 · Unit 5

    6 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)16.1.1 Standard electrode potentials and the hydrogen electrode
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  9. Q17(c)

    October 2024 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  10. Q4

    June 2024 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  11. Q5

    June 2024 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  12. Q14(b)(i)

    June 2024 · Unit 5

    2 marks16.1.1 Standard electrode potentials and the hydrogen electrode16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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    The start of question 14

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  13. Q1(a)

    January 2024 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  14. Q10

    October 2023 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  15. Q11

    October 2023 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)1.2.2 Reacting masses
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  16. Q18(a)

    October 2023 · Unit 5

    5 marks16.1.1 Standard electrode potentials and the hydrogen electrode16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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    The start of question 18

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  17. Q18(b)(ii)

    October 2023 · Unit 5

    2 marks16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  18. Q1

    June 2023 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  19. Q21(d)(ii)

    June 2023 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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  20. Q21(d)(iii)

    June 2023 · Unit 5

    1 mark16.1.2 Electrochemical cells, cell emf and cell diagrams (Core Practical 12)
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All 42 questions on Electrochemical cells, cell emf and cell diagrams (Core Practical 12), as a list
  1. June 2025, Unit 5, Q14(a) (2 marks): State the name and purpose of part X. (2)
  2. June 2025, Unit 5, Q14(b) (2 marks): Draw a cell diagram for this system. (2)
  3. June 2025, Unit 5, Q14(c) (2 marks): The electrode system for the titanium ions is shown. 3+(aq) + e –  Ti 2+(aq) Ti Ed = −0.37 V Calculate the Ed cell value. Use your Data Booklet. (2)
  4. June 2025, Unit 5, Q14(d) (3 marks): State the changes, if any, that would occur to the cell emf, the electrodes and the ion concentrations when current flows for several hours in this cell. (3)
  5. June 2025 (A), Unit 5, Q1(a) (1 mark): Which electrodes are used for this cell? (1) Electrode 1 Electrode 2 A iron zinc B platinum platinum C zinc iron zinc platinum D
  6. January 2025, Unit 5, Q18(a)(i) (4 marks): Identify, by name or formula, the substances needed in the salt bridge and the right‑hand half‑cell. Include concentrations where appropriate. (4) A Salt bridge
  7. January 2025, Unit 5, Q18(a)(ii) (1 mark): State why a salt bridge is used rather than a wire. (1)
  8. October 2024, Unit 5, Q17(a) (6 marks): Describe how you would carry out an experiment to determine the standard electrode potential of the electrode system shown. Co2+(aq) + 2e−  Co(s) Assume that y
  9. October 2024, Unit 5, Q17(c) (1 mark): The cell diagram for an electrochemical cell is shown. Ag(s) | Ag+(aq) || [VO2 +(aq) + 2H+(aq)], [VO2+(aq) + H2O(l)] | Pt(s) Write the reduction half-equation f
  10. June 2024, Unit 5, Q4 (1 mark): The emf, E d cell , of the cell made up of the copper and magnesium half‑cells is measured under standard conditions. The voltmeter used has a measurement uncer
  11. June 2024, Unit 5, Q5 (1 mark): Which is the diagram for the cell made up of the nickel and zinc half‑cells that gives a positive value for E d cell? Use your Data Booklet. A Zn(s) | Zn2+(aq)
  12. June 2024, Unit 5, Q14(b)(i) (2 marks): Identify X and Y. (2) X: Y:
  13. January 2024, Unit 5, Q1(a) (1 mark): Which electrodes are used for this cell? (1) electrode 1 electrode 2 A platinum platinum B platinum chromium C zinc chromium D zinc platinum
  14. October 2023, Unit 5, Q10 (1 mark): The emf, E cell , of a cell is +0.57 V. The numerical values of the standard electrode potentials of the two half-cells joined in this cell are 0.17 V and 0.40
  15. October 2023, Unit 5, Q11 (1 mark): An electrochemical cell is set up: • a half-cell is made from a piece of zinc and a solution of zinc chloride, ZnCl2 a second half-cell is made from a piece of
  16. October 2023, Unit 5, Q18(a) (5 marks): Draw a labelled diagram of the apparatus you would use to measure the standard electrode potential of a Cu2+(aq) | Cu(s) electrode with a standard hydrogen elec
  17. October 2023, Unit 5, Q18(b)(ii) (2 marks): Write the cell diagram, using the conventional representation of half-cells, for the reaction to produce chlorine. (2)
  18. June 2023, Unit 5, Q1 (1 mark): The equation for a redox reaction is shown. 2V2+(aq) + Cu2+(aq) → 2V3+(aq) + Cu(s) What is the cell diagram for this reaction? A V(s) | V3+(aq), V2+(aq) | | Cu(
  19. June 2023, Unit 5, Q21(d)(ii) (1 mark): A calomel electrode was used to measure the standard electrode potential of the Sn2+(aq) | Sn(s) half‑cell. – + V Sn(s) 1.0 mol dm–3 Sn2+(aq) The reading on the
  20. June 2023, Unit 5, Q21(d)(iii) (1 mark): Write the overall equation for the cell reaction. (1)
  21. January 2023, Unit 5, Q8 (1 mark): The cell diagram for an electrochemical cell is shown. Pt(s) | Fe2+(aq), Fe3+(aq) || Br2(aq), 2Br–(aq) | Pt(s) Ecell = +0.32 V What are the half-equations for t
  22. January 2023, Unit 5, Q20(f)(i) (2 marks): Write the half-equations for the reactions at the anode and the cathode. (2) anode half-equation: cathode half-equation:
  23. January 2023, Unit 5, Q20(f)(ii) (1 mark): The standard electrode potential for the Zn / ZnO half-cell is –1.28 V. Calculate the standard electrode potential for the MnO2 / Mn2O3 half-cell. (1)
  24. October 2022, Unit 5, Q3(a) (1 mark): What materials will be used for the electrodes in this cell? (1) 2− , Cr3+ TiO2+ , Ti3+ Cr2O7 A chromium titanium B chromium platinum C platinum titanium D plat
  25. June 2022, Unit 5, Q17(d)(i) (3 marks): Draw a labelled diagram of the apparatus used to measure the emf of a cell with copper and zinc electrodes under standard conditions. (3)
  26. January 2022, Unit 5, Q3(a) (1 mark): Which silver compound could be used as the electrolyte in the left‑hand half‑cell? (1) A silver nitrate B silver hydroxide C silver chloride D silver carbonate
  27. January 2022, Unit 5, Q3(d) (1 mark): Which is the value of Ecell in volts? (1) A −1.80 B −0.20 C +0.20 D +1.80
  28. January 2022, Unit 5, Q3(e) (1 mark): Which is the cell diagram for this cell, using the conventional representation of half‑cells? (1) A Ag(s) | Ag+(aq) | | [VO2 +(aq) + 2H+(aq)] | [VO2+(aq) + H2O(
  29. January 2022, Unit 5, Q10(c) (1 mark): The overall reaction in a silver cell used in watch batteries is Ag2O(s) + H2O(l) + Zn(s) → 2Ag(s) + Zn(OH)2(s) The half‑equation for the reaction at the positi
  30. October 2021, Unit 5, Q1(a) (1 mark): Which material should be used for each electrode? (1) Electrode 1 Electrode 2 A Na2Cr2O7 Cr2O3 H2 Cr B Pt Cr C Pt Pt D
  31. October 2021, Unit 5, Q1(c) (1 mark): Solution 2 contains 14.71 g of K2Cr2O7 . What mass of Cr2(SO4)3⋅18H2O should also be used? Cr2(SO4)3⋅18H2O = 716.3] [Mr values: K2Cr2O7 = 294.2 (1) A 8.95 g B 1
  32. October 2021, Unit 5, Q1(d) (1 mark): Solution 2 is best acidified with (1) A H2SO4 B HCl C HBr D H2CrO4 Use this space for any rough working. Anything you write in this space will gain no credit.
  33. October 2021, Unit 5, Q2 (1 mark): The equation for a redox reaction is 5Fe2+(aq) + MnO 4 –(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) Which is the correct cell diagram to measure E d cell fo
  34. October 2021, Unit 6, Q1(c)(ii) (3 marks): A student drew a diagram of an experiment to measure the standard emf of the cell. low voltage supply copper iron solution containing solution containing Cu2+(a
  35. June 2021, Unit 5, Q2(a) (1 mark): The electrode potential for the Fe3+/ Fe2+ electrode system is +0.77 V. What is the electrode potential for the Ti2+/Ti electrode system? (1) A −3.17 V B −1.63
  36. June 2021, Unit 5, Q2(b) (1 mark): What metals should be used for the electrodes in the cell for this reaction? (1) Metals used for the electrode Fe3+/ Fe2+ electrode system Ti2+/ Ti electrode sy
  37. January 2021, Unit 5, Q3(a) (1 mark): What is the cell diagram for this cell? (1) A Fe(s) | Fe2+(aq) || Sn(s) | Sn2+(aq) B Fe2+(aq) | Fe(s) || Sn2+(aq) | Sn(s) C Fe(s) | Fe2+(aq) || Sn2+(aq) | Sn(s)
  38. January 2021, Unit 5, Q3(b) (1 mark): The standard electrode potential for the Fe / Fe2+ electrode system is −0.44 V and E d cell for the reaction is +0.30 V. What is the standard electrode potentia
  39. January 2021, Unit 5, Q21(a) (2 marks): Deduce the formulae of the ions responsible for the colours of F and G, using the standard electrode potential and E d given, and the values in the Data Booklet
  40. January 2021, Unit 5, Q21(b) (2 marks): Write the overall equation for the reaction in the cell. State symbols are not required. (2)
  41. October 2020, Unit 5, Q21(a) (3 marks): The half-equation for an iron(III) / iron(II) half-cell is Fe3+(aq) + e− ⇌ Fe2+(aq) The standard electrode potential of this half-cell is measured using the app
  42. October 2020, Unit 5, Q21(b) (3 marks): The cell diagram for an electrochemical cell is — O Pt | [Mn2+ + 4H2O], [MnO4 − + 8H+] [BiO3 − + 6H+], [Bi3+ + 3H2O] | Pt E cell = +0.09 V Write the half-equati

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