A technician tests electrode pairs for an electronic door sensor. Each cell uses the same electrolyte and the same conditions. Silver is the least reactive of the four metals tested.
The results are shown in the table.
| Electrode pair | Voltage / V |
|---|---|
| magnesium and silver | 2.2 |
| iron and silver | 1.1 |
| copper and silver | 0.4 |
| iron and copper | 0.7 |
Use the results to state the order of reactivity of the four metals, starting with the most reactive.
The technician makes another cell using magnesium and copper electrodes with the same electrolyte and conditions. Compare the voltage of this cell with the voltage of the iron and copper cell. Explain your answer.
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.