A metal oxide reacts with carbon monoxide in a sealed apparatus. The table shows the substances before and after the reaction.
| Substance before the reaction | Mass before the reaction in g | Substance after the reaction | Mass after the reaction in g |
|---|---|---|---|
| Metal oxide | 18.0 | Metal | 14.4 |
| Carbon monoxide | 6.3 | Carbon dioxide | 9.9 |
Use the changes in mass to explain why this is a redox reaction.
86 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.