A scientist is investigating the thermal properties and phase transitions of a chemical compound, J, starting from its solid state.
The scientist begins with a sample of solid compound J inside a sealed crucible at an initial temperature of −20∘C-20^{\circ}\text{C}−20∘C. They supply heat to the crucible at a constant rate for 30 minutes.
Figure 1 shows a graph of the temperature of compound J over this 30-minute period.
| Time (minutes) | Temperature (∘C^{\circ}\text{C}∘C) |
|---|---|
| 0 | -20 |
| 4 | 40 |
| 12 | 40 |
| 22 | 110 |
| 30 | 110 |
Using information from the graph and table, describe the changes that take place in the 30 minutes shown.
Your answer should refer to:
- specific data (times and temperatures) from the graph
- the state (solid, liquid, or gas) of compound J at each stage.
Heating, specific heat and latent heat Questions
Practise Edexcel GCSE Physics Heating, specific heat and latent heat with exam-style questions for Foundation and Higher tier. 81 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.