A reusable heat pack contains a substance. The table gives information from a test of the heat pack. Assume that all the energy released by the substance is transferred to the surroundings.
| Quantity or stage | Information |
|---|---|
| Mass of substance | 0.60 kg |
| Cooling stage | The substance is liquid and cools from 78 ∘C78\ ^\circ\mathrm{C}78 ∘C to 58 ∘C58\ ^\circ\mathrm{C}58 ∘C |
| Rate of energy transfer during cooling | 50 W |
| Duration of cooling stage | 10 min |
| Freezing stage | The substance stays at 58 ∘C58\ ^\circ\mathrm{C}58 ∘C while all the liquid changes to a solid |
| Rate of energy transfer during freezing | 50 W |
| Duration of freezing stage | 50 min |
Calculate the specific heat capacity of the substance in its liquid state and its specific latent heat of fusion.
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.