A cast iron frying pan has a mass of 1.5 kg.
Use the equation: change in thermal energy=mass×specific heat capacity×change in temperature\text{change in thermal energy} = \text{mass} \times \text{specific heat capacity} \times \text{change in temperature}change in thermal energy=mass×specific heat capacity×change in temperature
The pan starts at 20 ∘C20\ ^{\circ}\text{C}20 ∘C. A cooker transfers 54 000 J54\,000\ \text{J}54000 J of energy to the pan.
The specific heat capacity of cast iron is 450 J/kg ∘C450\ \text{J/kg}\ ^{\circ}\text{C}450 J/kg ∘C.
Calculate the final temperature of the pan.
An aluminium pan has the same mass. It also starts at 20 ∘C20\ ^{\circ}\text{C}20 ∘C and is given 54 000 J54\,000\ \text{J}54000 J of energy.
The specific heat capacity of aluminium is 900 J/kg ∘C900\ \text{J/kg}\ ^{\circ}\text{C}900 J/kg ∘C.
State and explain whether the final temperature of the aluminium pan is higher or lower than the final temperature of the iron pan.
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.