A student finds the specific heat capacity of a 1.0 kg aluminium block. She uses a heater and a joulemeter.
The Table shows her results.
Table
| Energy supplied in kJ\text{kJ}kJ | Temperature of block in ∘C^{\circ}\text{C}∘C |
|---|---|
| 0 | 20.0 |
| 15.0 | 36.0 |
| 30.0 | 51.5 |
| 45.0 | 66.0 |
Use the first and last rows of the Table to calculate the specific heat capacity of aluminium.
Give your answer to 2 significant figures.
The accepted value of the specific heat capacity of aluminium is 900 J/kg ∘C900\ \text{J/kg}\ ^{\circ}\text{C}900 J/kg ∘C.
Explain why the student's value is greater than the accepted value.
Suggest two improvements to the method that would give a more accurate value.
The temperature rise for each 15.0 kJ of energy supplied gets smaller as the experiment goes on.
Explain why.
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.