A student dissolves some ammonium nitrate in water in a polystyrene cup. The table shows the temperature of the water before the solid is added and the lowest temperature reached.
| Measurement | Temperature (°C) |
|---|---|
| Before adding ammonium nitrate | 20.5 |
| Lowest temperature after adding ammonium nitrate | 15.2 |
Use the results to explain whether dissolving ammonium nitrate in water is exothermic or endothermic.
106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.