Question

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

• A. wind speed
• B. temperature
• C. surface area
• D. insoluble heavy impurities

Answer 1

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.