A designer investigates displacement reactions for use in a self-heating container.
The designer uses the same mass of metal powder and the same volume and concentration of solution in each mixture. Each mixture has the same starting temperature.
| Mixture | Metal powder | Solution | Temperature rise (∘C^\circ\mathrm{C}∘C) |
|---|---|---|---|
| 1 | Zinc | Iron sulfate | 3.8 |
| 2 | Iron | Copper sulfate | 5.6 |
| 3 | Zinc | Copper sulfate | Not tested |
Use the results to explain why mixture 3 will react and predict how its temperature rise will compare with mixtures 1 and 2.
113 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.