Question detail
Which factor can affect the cell potential of an electrochemical cell?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Electrode potentials and electrochemical cells (A-level only)
Question
- A. The type of electrodes used.
- B. The color of the solution.
- C. The shape of the container.
- D. The time the cell has been operating.
Answer
The type of electrodes used.
Explanation
The correct option is The type of electrodes used.. The type of electrodes used. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain limitations of predictions based on standard conditions. This reasoning is anchored to Feasibility and applications of cells (A-level only) in Electrode potentials and electrochemical cells (A-level only), and it separates predictions from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misunderstanding Standard Conditions
Students often assume that predictions based on standard electrode potentials are always accurate in real-world conditions without considering limitations.
To correct this, remember that standard conditions (1 mol/dm³ concentration, 1 atm pressure, 25°C) may not reflect actual conditions in a cell. Always evaluate how changes in concentration or temperature can affect the electrode potential and the feasibility of the reaction. Keep the correction anchored to Feasibility and applications of cells (A-level only) and the objective: Explain limitations of predictions based on standard conditions.
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