An engineer tests four simple cells under the same conditions.
| Cell | Metal electrodes | Electrolyte | Voltage in V |
|---|---|---|---|
| 1 | zinc and copper | P | 1.10 |
| 2 | zinc and copper | Q | 0.86 |
| 3 | iron and copper | P | 0.70 |
| 4 | iron and copper | Q | 0.52 |
The engineer claims, ‘The electrolyte affects the voltage, but the metals used as electrodes do not affect the voltage.’
Evaluate the engineer’s claim. Use data from the table.
90 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries, 5.2.2a Fuel cells, and 5.2.2b Half equations for hydrogen fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.