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2.2 Thermal properties and temperature

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Question 78

Ethanol is a volatile liquid at room temperature. The rate at which the ethanol evaporates can be significantly increased by bubbling dry air through it.

Three students propose explanations for why this process increases the evaporation rate:

  • Student 1: Bubbling increases the total surface area of the liquid in contact with air.
  • Student 2: The flow of air carries evaporated molecules away, reducing the rate at which they condense back into the liquid.
  • Student 3: The process of bubbling air increases the temperature of the ethanol.

Which students are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2, and 3

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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