When the keypad on an electronic door lock is used, a complete circuit is formed and a chemical cell supplies a current. After many uses, the cell can still supply a current. Which statement explains why the cell can still supply a current?
The cell is converting electrical energy back into chemical energy
The reactants in the cell are still able to continue reacting
The electrolyte is supplying electrical energy without a chemical reaction
The metal electrodes are touching each other inside the cell
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.