Question detail
For Cells and batteries, which answer best supports this AQA GCSE Chemistry Unit 4.5 objective: (chemistry only) Explain why two different electrodes are needed in a simple chemical cell?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
- A. chemistry only: correct Unit 4.5 answer for Cells and batteries
- B. Incorrect: confuses chemistry only with a nearby Energy changes idea
- C. Incorrect: gives a general chemistry statement without linking to Cells and batteries
- D. Incorrect: reverses the energy-change relationship in Chemical cells and fuel cells (chemistry only)
Answer
The correct option is chemistry only: correct Unit 4.5 answer for Cells and batteries.
Explanation
The correct option is chemistry only: correct Unit 4.5 answer for Cells and batteries. It directly supports the approved learning objective to (chemistry only) Explain why two different electrodes are needed in a simple chemical cell. This keeps the answer anchored to Cells and batteries within Chemical cells and fuel cells (chemistry only), and avoids mixing energy transfer, reaction profiles, activation energy, chemical cells, fuel cells, exothermic reactions and endothermic reactions unless the objective names them.
Common mistake
Misunderstanding Electrode Function
Students often think that both electrodes in a simple chemical cell can be the same material, believing this would not affect the cell's function.
Emphasize that different electrodes are needed to create a potential difference, as they must have different reactivities to drive the electrochemical reactions.
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