A student carries out two experiments.
After each heating, the student cools and weighs the solid.
| Heating stage | Mass of solid in experiment 1 in g | Mass of solid in experiment 2 in g |
|---|---|---|
| Before heating | 3.25 | 4.00 |
| After the first heating | 3.68 | 3.72 |
| After the second heating | 3.96 | 3.38 |
| After the third heating | 4.05 | 3.20 |
| After the fourth heating | 4.05 | 3.20 |
Explain why the masses of the two solids changed in opposite directions. Name the process occurring to the zinc and the process occurring to the copper oxide.
Predict the mass of each solid after a fifth heating. Give a reason for your answers.
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.