The diagram shows a simple cell: copper and zinc electrodes in dilute sulphuric acid, connected through a voltmeter. The experiment was repeated with different metals replacing the zinc electrode. The results are shown in the table.

1. aDescribe how the cell produces an electric current. [2]
2. bWhich electrode is the cathode? [1]
3. cWrite the equation for the reaction taking place at the zinc electrode. [1]
4. dUsing the voltages, place the metals in order of their reactivity, starting with the most reactive. [2]
5. eCalculate the voltage obtained if the copper electrode was replaced with lead and the zinc electrode replaced with tin. [1]

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