A student heats 0.25 kg of water in a pan on an electric hob.
The Table shows the temperature of the water every minute.
Table
| Time in minutes | Temperature in ∘C^{\circ}\text{C}∘C |
|---|---|
| 0 | 20 |
| 1 | 38 |
| 2 | 56 |
| 3 | 74 |
| 4 | 92 |
| 5 | 100 |
| 6 | 100 |
Describe the pattern shown by the results.
Calculate the energy transferred to the water in the first 4 minutes.
The specific heat capacity of water is 4200 J/kg ∘C4200\ \text{J/kg}\ ^{\circ}\text{C}4200 J/kg ∘C.
Use the equation
ΔQ=m×c×Δθ\Delta Q = m \times c \times \Delta \thetaΔQ=m×c×Δθ
The hob transfers energy to the water at the same rate between 5 minutes and 6 minutes.
Explain what happens to this energy.
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.