A student makes four chemical cells using the same electrolyte.
| metal pair | voltage / V |
|---|---|
| magnesium and copper | 1.8 |
| zinc and copper | 1.1 |
| iron and copper | 0.8 |
| copper and copper | 0.0 |
Which conclusion is best supported by the results?
The voltage increases as the difference in reactivity between the metals increases
A cell produces a voltage only when both electrodes are the same metal
Copper always supplies electrons to the other electrode
The electrolyte determines the voltage independently of the metals
42 exam-style questions on Edexcel GCSE Chemistry 6.4 Chemical cells and fuel cells, covering 6.4.1 Chemical cells and fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.