WJEC A Level Chemistry
WJEC A Level Chemistry 3.1 Redox and Standard Electrode Potentials Exam Questions
Free WJEC A Level Chemistry exam questions on 3.1 Redox and Standard Electrode Potentials, with mark schemes. Covers half-equations, electrode potentials, the standard hydrogen electrode and electrochemical cells.
3.1 Redox and Standard Electrode Potentials exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Chemistry 3.1 Redox and Standard Electrode Potentials
This topic covers redox in terms of electrode potentials.
What you need to know
- Half-equations Writing and combining half-equations.
- Standard electrode potentials Measured against the standard hydrogen electrode at 298 K, 1 mol dm⁻³ and 100 kPa.
- Cells E°cell = E°(right) − E°(left); predicting feasibility.
- Fuel cells Hydrogen fuel cells and their advantages and limitations.
Common mistakes in 3.1 Redox and Standard Electrode Potentials
- Reversing the sign incorrectly when calculating E°cell.
- Forgetting standard conditions.
- Saying a positive E°cell guarantees a fast reaction.
Try three 3.1 Redox and Standard Electrode Potentials exam-style questions
1. State the conditions for the standard hydrogen electrode. (2 marks)
Show the mark scheme answer
1 mol dm⁻³ H⁺ and 100 kPa H₂ (1) at 298 K with a platinum electrode (1).
2. E° for Zn²⁺/Zn is −0.76 V and Cu²⁺/Cu is +0.34 V. Calculate E°cell. (1 mark)
Show the mark scheme answer
0.34 − (−0.76) = 1.10 V.
3. Explain why a feasible reaction may not occur. (1 mark)
Show the mark scheme answer
The activation energy may be too high, so the rate is very slow.
3.1 Redox and Standard Electrode Potentials FAQs
What does Redox and Standard Electrode Potentials cover?
Half-equations, electrode potentials, the SHE and electrochemical cells.
Which practical links here?
Measuring cell EMFs.
How is feasibility predicted?
A positive E°cell indicates the reaction is feasible.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
