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2.2 Thermal properties and temperature

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Question 317

During evaporation, some liquid molecules escape from the surface into the gas phase, which causes a change in the temperature of the remaining liquid.

Which row correctly describes the relative kinetic energy of the escaping molecules compared to the average, and the subsequent temperature change of the remaining liquid?

A

Kinetic energy of escaping molecules: Lower than average; Temperature of remaining liquid: Decreases

B

Kinetic energy of escaping molecules: Lower than average; Temperature of remaining liquid: Increases

C

Kinetic energy of escaping molecules: Higher than average; Temperature of remaining liquid: Decreases

D

Kinetic energy of escaping molecules: Higher than average; Temperature of remaining liquid: Increases

Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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