The temperature of a quantity of nitrogen gas is decreased. Describe the effect of this decrease in temperature on the motion of the nitrogen molecules.
The temperature of a copper rod is increased. Describe the effect of this increase in temperature on the density of the copper. Explain your answer in terms of the separation of the atoms.
A block of ice at 0∘C0^{\circ}\text{C}0∘C is being melted. The specific latent heat of fusion of ice is 3.4×105 J/kg3.4 \times 10^5\text{ J/kg}3.4×105 J/kg.
Calculate the power needed to melt 0.15 kg0.15\text{ kg}0.15 kg of this ice in 150 s150\text{ s}150 s.
The ice is melted using an electric immersion heater. The electrical power supplied to the heater is found to be greater than the power calculated in (b)(i). Suggest one reason why this is so.
313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.