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2.2.3a Melting, boiling, condensation and solidification

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Question 32

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

2.2.3a Melting, boiling, condensation and solidification Questions

  1. IGCSE
  2. /Physics
  3. /2.2.3a Melting, boiling, condensation and solidification

313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.

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