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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Thermal properties and temperature

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Thermal properties and temperature

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Paper 3Theory (Core)2 marks

Understanding the cooling effect of evaporation in everyday life.

Description

Cooling Effect of Evaporation

When sweat evaporates from the skin, it cools the body down. This is because the molecules with the highest energy escape into the air, leaving behind cooler molecules.

  1. a

    Explain how evaporation leads to a decrease in temperature of a liquid.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Thermal properties and temperature

Paper 3Theory (Core)4 marks

Description

Evaporation and Temperature Change

In various cooling systems, evaporation is utilized to lower temperatures. For example, in refrigerators, the refrigerant evaporates to absorb heat from the surroundings.

  1. a

    Discuss the importance of evaporation in cooling systems.

    Aim for approximately 4 distinct marking points.

    [4]