A laboratory technician monitors four different reactions using temperature probes in insulated containers. The starting temperature and the highest or lowest temperature reached are shown in the table.
| Reaction | Starting temperature (°C) | Highest or lowest temperature reached (°C) |
|---|---|---|
| P | 21.0 | 28.0 |
| Q | 20.0 | 20.0 |
| R | 24.0 | 19.0 |
| S | 16.0 | 18.0 |
In which reaction was energy taken in from the surroundings?
Reaction P
Reaction Q
Reaction R
Reaction S
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.