Physics 0625 · IGCSE · Thermal properties and temperature
Thermal properties and temperature — practice question
Two pans of water sit on the hotplates of an electric cooker, as illustrated in Fig. 5.1. One pan is small and the other is large. Once the hotplates are turned on, the water temperature in both pans begins to rise. When the water is below 100 ^{\circ}C, some of it is evaporating. At 100 ^{\circ}C, boiling begins and the temperature stays unchanged.
(a)[1]
State and explain which pan has the higher rate of evaporation of water when both pans of water are at the same temperature.
(b)[1]
Leaving out the temperature at which it happens, state how boiling is different from evaporation.
(c(i))[2]
Explain the effect of the thermal energy supplied on the molecules.
(c(ii))[3]
Calculate the mass of water that boils away in 5.0 minutes.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “larger saucepan AND larger surface area.” …