A manufacturer is testing a prototype chemical cell for an electronic door lock. The same cell is used throughout the investigation.
| Test | Treatment before the test | Result when connected in a complete circuit |
|---|---|---|
| 1 | The cell had not been used | Current flowed |
| 2 | The cell was used until it stopped supplying electricity | No current flowed |
| 3 | An external current was passed through the cell after test 2 | Current flowed |
| 4 | The cell was used until it stopped supplying electricity again | No current flowed |
| 5 | An external current was passed through the cell after test 4 | Current flowed |
Explain what the results show about the prototype cell and its chemical reactions.
The manufacturer considers repeating the investigation with a used-up alkaline battery. Predict the result when the alkaline battery is tested after an external current has been passed through it. 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.