A student investigates how the mass of ammonium nitrate affects the temperature change when it dissolves in water.
The student uses 25.0 cm³ of water in each trial.
The table shows the results.
| Mass of ammonium nitrate (g) | Starting temperature (°C) | Lowest temperature (°C) |
|---|---|---|
| 0.50 | 20.0 | 18.5 |
| 1.00 | 20.0 | 17.0 |
| 1.50 | 20.0 | 15.5 |
| 2.00 | 20.0 | 14.5 |
Describe a method for carrying out this investigation. Explain the pattern shown by the results.
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.