Question

*State the effect of (i) surface area (ii) nature of the liquid on the rate of evaporation

Answer 1

Explanation:

Surface area- Rate of evaporation increases with the increase in surface area of the liquid since evaporation is a surface phenomenon. Nature of liquid-More volatile liquid evaporates faster than the less volatile liquid.

Answer 2

The answer to the given questions are -

(i) Evaporation is directly proportional to the surface area.

• It is a surface phenomenon, wherein the increase in the surface area leads to an increase in the rate of evaporation.
• Similarly, a decrease in the surface area would decrease the rate of evaporation.
• The molecules on the surface get evaporated, after which the next layer becomes the surface and it keeps on going.
• The more the area, the more the exposure to surrounding heat.

(ii) Nature of liquid (as it is volatile or non-volatile) also affects the rate of evaporation.

• A volatile substance would be more easily evaporated as compared to a non-volatile substance.

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