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2.2 Thermal properties and temperature

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Question 64

A drop of water is spilled onto a hot surface and begins to evaporate.

Which molecules are the first to escape into the air, and what happens to the average speed of the remaining water molecules?

A

Least energetic molecules; average speed decreases

B

Least energetic molecules; average speed increases

C

Most energetic molecules; average speed decreases

D

Most energetic molecules; average speed 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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