A student does four reactions. Each reaction uses the same volume of solution.
The table shows the start and end temperatures of each reaction.
| Reaction | Temperature at start (∘C^\circ\mathrm{C}∘C) | Temperature at end (∘C^\circ\mathrm{C}∘C) |
|---|---|---|
| A | 18.0 | 25.5 |
| B | 22.0 | 27.0 |
| C | 21.0 | 12.5 |
| D | 20.0 | 20.5 |
Which reaction transfers the most energy to the surroundings?
Reaction A
Reaction B
Reaction C
Reaction D
51 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.