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MDCAT
Chemistry
2011

Chemistry · States of Matter - Gases, Liquids and Solids

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

Rate of evaporation of a liquid does not depend on

Options
  • A

    Surface area of liquid

  • B

    Material of container

  • C

    External pressure

  • D

    Temperature

Explanation

External pressure can affect the boiling point of a liquid, but it doesn't significantly impact the rate of evaporation. Evaporation occurs when molecules escape from the liquid into the gas phase at temperatures below the boiling point. Changes in external pressure usually have a more noticeable effect on boiling, not on everyday evaporation.

The rate of evaporation is affected by the surface area of the liquid. A larger surface area will lead to a faster rate of evaporation.This is because there are more liquid molecules exposed to the air, increasing the chances of molecules escaping into the gas phase.

The material of the container can influence the rate of evaporation. Materials that are good conductors of heat, like metal, can help in faster evaporation because they can transfer heat to the liquid, increasing the kinetic energy of the liquid molecules.However, the material of the container primarily affects heat transfer, not the rate of evaporation itself.

External pressure can affect the boiling point of a liquid, but it doesn't significantly impact the rate of evaporation. Evaporation occurs when molecules escape from the liquid into the gas phase at temperatures below the boiling point. Changes in external pressure usually have a more noticeable effect on boiling, not on everyday evaporation.

Temperature has a significant influence on the rate of evaporation. Higher temperatures generally lead to faster evaporation because they provide more thermal energy to the liquid molecules, increasing their kinetic energy and the likelihood of transitioning into the gas phase.

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Tagged under Chemistry · States of Matter - Gases, Liquids and Solids · 2011