Physics 0625 · IGCSE · Thermal properties and temperature
Thermal properties and temperature — practice question
At room temperature in a laboratory, 200 g of water is placed in a beaker. The water has a thermometer reading of 22 ^{\circ}C. Ice at 0 ^{\circ}C is introduced in small pieces, one piece at a time. After each addition, the mixture is stirred until the ice has completely melted. The additions continue until the thermometer shows 0 ^{\circ}C. It is then found that the total mass of ice added is 60 g.
(a)[2]
Calculate how much thermal energy is lost by the water that was originally in the beaker.
(b)[2]
Calculate the specific latent heat of fusion of ice for this experiment.
(c)[1]
Suggest a reason why the value of the specific latent heat of fusion of ice found in (b) may be inaccurate. Assume that the temperature readings and the values for the mass of the water and the mass of the ice are accurate.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Q = m c Δ\theta, or 200 \times 4.2 \times 22” …