A student melts some wax and then lets it cool.
The table shows the temperature of the wax as it cools.
Table
| Time (minutes) | Temperature (∘C{}^\circ\text{C}∘C) |
|---|---|
| 0 | 75 |
| 1 | 64 |
| 2 | 55 |
| 3 | 55 |
| 4 | 55 |
| 5 | 55 |
| 6 | 47 |
| 7 | 40 |
Which statement describes the energy stored in the wax between 2 minutes and 5 minutes?
It decreases, as energy is transferred to the surroundings while the wax solidifies
It stays the same, as the temperature of the wax does not change during this time
It increases, as energy is released when the wax particles form bonds with each other
It stays the same, as no energy is transferred to or from the wax while it solidifies
44 exam-style questions on OCR GCSE Physics 1.2 Changes of state, covering 1.2.1 Conservation of mass during changes of state, 1.2.2 Physical and chemical changes, 1.2.3 Heating, temperature and changes of state, 1.2.4 Specific heat capacity and specific latent heat, 1.2.5 Internal energy and temperature change, and 1.2.6 Energy transfer during a change of state. Each one has a worked solution and a mark scheme showing where the marks go.