A student melts some wax in a boiling tube. She then lets the liquid wax cool and measures its temperature every minute.
The Table shows her results.
Table
| Time in minutes | Temperature in ∘C^{\circ}\text{C}∘C |
|---|---|
| 0 | 80 |
| 1 | 70 |
| 2 | 62 |
| 3 | 56 |
| 4 | 56 |
| 5 | 56 |
| 6 | 56 |
| 7 | 50 |
| 8 | 45 |
State the freezing point of the wax.
Describe what is happening to the wax between 3 minutes and 6 minutes.
Describe how the temperature of the wax changes between 0 minutes and 3 minutes.
State the melting point of the wax. Give a reason for your answer.
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.