Question detail
A student builds a cell with two copper electrodes in salt solution. What is the main weakness in the design?
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. The electrodes are not two different metals.
- B. The electrolyte should be removed completely.
- C. Copper cannot conduct electricity.
- D. The solution makes the cell rechargeable automatically.
Answer
The electrodes are not two different metals. Two identical copper electrodes remove the key difference needed in a simple cell.
Explanation
The electrodes are not two different metals, so the setup lacks the contrast in reactivity that produces a useful potential difference. The salt solution can be an electrolyte, but it cannot replace the need for different electrodes.
Common mistake
Misunderstanding Simple Cells
Students often describe a simple cell as just two metals without mentioning the electrolyte.
Emphasize that a simple cell consists of two different metals in contact with an electrolyte, which is essential for the chemical reaction to produce electricity.
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