A remote weather sensor is powered by one simple cell. A technician tests three candidate metals, T, W and X, by pairing each metal with reference metal N.
Metal N is more reactive than each candidate metal. The electrolyte and all other conditions are the same in each test.
| Candidate metal paired with N | Voltage in V |
|---|---|
| T | 0.28 |
| W | 0.64 |
| X | 1.09 |
The cell used in the sensor must contain two of the candidate metals T, W and X.
Explain which two candidate metals should be used to produce the largest voltage.
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.