A student investigated the electrolysis of silver nitrate solution using active silver electrodes.
Table 1 shows the mass measurements of the silver electrodes before and after the electrolysis was carried out for 20 minutes.
| Electrode | Mass before electrolysis (g) | Mass after electrolysis (g) | Change in mass (g) |
|---|---|---|---|
| Anode (positive electrode) | 12.45 | 11.23 | -1.22 |
| Cathode (negative electrode) | 10.15 | 11.35 | +1.20 |
Explain, in terms of silver atoms and ions, the changes in mass of the two electrodes shown in Table 1.
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.