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Question

Which of the following does not affect the rate of evaporation?


A

wind speed

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B

temperature

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C

surface area

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D

insoluble heavy impurities

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Solution

The correct option is D

insoluble heavy impurities


The explanation for the correct option:

Evaporation

  • Evaporation is the process in which a substance in its liquid state is converted into its gaseous state.
  • It is a surface phenomenon and the process requires heat energy.
  • When heat is supplied to a liquid, the kinetic energy of the molecules on its surface increases. Once they gain sufficient energy to break the bonds, they dissipate into the air.

Factors affecting evaporation:

  • The evaporation rate is dependent on certain variables such as temperature, surface area, wind speed, etc. B
  • However, it is not affected in the case of insoluble heavy impurities.
  • Insoluble heavy impurities will still stay in the solution and not affect the process of evaporation.
  • Hence, this option is correct.

The explanation for incorrect options:

Option A: wind speed

  • Wind speed affects the process of evaporation.
  • The evaporation process will increase as the wind speed increases.
  • The wind carries away the vapor molecules, clearing space for new vapor molecules in the air the liquid surface.
  • Hence, this option is incorrect.

Option B: temperature

  • Temperature affects the process of evaporation.
  • The evaporation process will increase as the temperature increases.
  • As the temperature increases, more energy will be absorbed by the liquid. The surface molecules will easily absorb enough energy to break away from the surface of the liquid.
  • Hence, this option is incorrect.

Option C: surface area

  • Surface area affects the process of evaporation.
  • The evaporation process will increase as the surface area increases.
  • As the surface area increases, more molecules will be present on the surface of the liquid. The molecules present on the surface of the liquid are the ones that cause evaporation.
  • Hence, this option is incorrect.

Hence, option D insoluble heavy impurities are the correct option.


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