An analyst investigated the temperature changes that occur when three different anhydrous compounds, A, B, and C, are dissolved in water.
Their results are shown in the table below.
| Compound | Initial temperature of water in °C | Final temperature of mixture in °C | Temperature change in °C |
|---|---|---|---|
| A | 19.4 | 12.1 | -7.3 |
| B | 19.4 | 28.9 | +9.5 |
| C | 19.4 | 34.2 |
Explain which compound produces the largest exothermic temperature change.
You should calculate the temperature change for compound C in your answer.
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.