plumiE°cell, entropy, K and the limits of predictions: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 16.1.4 E°cell, entropy, K and the limits of predictions, 2019–2025, with mark schemes and examiner’s reports where available.
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All 13 questions on E°cell, entropy, K and the limits of predictions, as a list
- June 2025 (A), Unit 5, Q4 (1 mark): The standard emf, Ed cell , of a reaction is positive. Which must be correct? A the entropy change of the system, ΔS d system , is positive B the entropy change
- January 2025, Unit 5, Q8 (1 mark): Which is correct about standard electrode potentials? cell is proportional to ln K and ln ΔStotal A E d cell is proportional to ln K and ΔStotal B E d cell is p
- June 2024, Unit 5, Q6 (1 mark): Which graph shows the relationship between E d cell plotted on the x‑axis and ΔStotal on the y‑axis for any electrochemical system? A B C D
- January 2024, Unit 5, Q1(c) (1 mark): What can be deduced from the fact that, for this reaction, Ecell is positive? (1) A ΔStotal and ln K are positive B ΔStotal and ln K are negative C ΔStotal is p
- October 2023, Unit 5, Q7 (1 mark): E cell is directly proportional to A ∆ rH and ln K B ∆ rH and ln RT C ∆Stotal and ln K D ∆Stotal and ln RT Use this space for any rough working. Anything you wr
- October 2023, Unit 5, Q18(b)(i) (3 marks): Explain, in terms of electrode potentials, why acidified dichromate(VI) ions react with concentrated hydrochloric acid to form chlorine, even though E cell = −
- June 2023, Unit 5, Q3 (1 mark): In a chemical reaction, Ecell is directly proportional to A Kc B rH C Ssystem D Stotal
- June 2023, Unit 5, Q4 (1 mark): For the reaction shown, Ecell = +0.89 V. 4V3+(aq) + O2(g) + 2H2O(l) → 4VO2+(aq) + 4H+(aq) Which statement can be deduced from this information only? A the react
- October 2022, Unit 5, Q4 (1 mark): The possibility of a reaction between potassium dichromate(VI) and hydrochloric acid may be assessed using standard electrode potentials but also depends on the
- June 2022, Unit 5, Q17(a)(ii) (3 marks): Explain, by considering both thermodynamic and kinetic factors, why HSO3 reduces Cu2+ to Cu+ but does not then reduce Cu+ to Cu. Use the data in the table. (3)
- June 2022, Unit 5, Q17(d)(ii) (3 marks): The Nernst equation describes the relationship between the concentration of metal ions in a half-cell and its electrode potential. E = E + 0 0260 . × ln [ion] z
- June 2022, Unit 6, Q3(b)(ii) (2 marks): Explain why the redox reaction does, in fact, take place. (2)
- October 2020, Unit 5, Q21(c) (2 marks): The standard electrode potential, E Cr3+(aq) + 3e− ⇌ Cr(s) The effect on the electrode potential, E, of changing the concentration of the ions in the half cell
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