Physics 0625 · IGCSE · Transfer of thermal energy

Transfer of thermal energy — practice question

On a warm, dry picnic day, a metal can of lemonade is covered with a damp cloth. Evaporation lowers the temperature of the water in the cloth.
(a)[3]

Explain, using molecules, why evaporation cools the water in the cloth.

(b)[3]

Explain how electrons carry thermal energy through the metal in the can.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: more energetic / faster / higher-speed molecules escape (into air)

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