A technician tests a sealed pouch containing two chemicals. The pouch is placed in water and the chemicals are mixed at 0 minutes. The temperature of the surrounding water is recorded.
The results are shown in the table.
| Time in minutes | Temperature of water in ∘C^\circ\text{C}∘C |
|---|---|
| 0 | 20.0 |
| 1 | 24.8 |
| 2 | 29.1 |
| 3 | 31.4 |
| 4 | 30.6 |
Calculate the greatest temperature change of the water.
Explain what the temperature change shows about the reaction. In your answer, compare the energy stored in the products with the energy stored in the reactants.
85 exam-style questions on AQA GCSE Chemistry 5.1 Exothermic and endothermic reactions, covering 5.1.1 Energy transfer during exothermic and endothermic reactions, 5.1.2 Reaction profiles, and 5.1.3 The energy change of reactions. Each one has a worked solution and a mark scheme showing where the marks go.