Question

Give reason for the increase in the rate of evaporation of a liquid when:-

a.air is blown above the liquid

b.surface area of liquid is increased

c.temperature of liquid is increased

Answer 1

a. When air is blown above the liquid, the speed by which the vapours move increases. Hence the rate of evaporation increases.

b. When the surface area is increased, rate of evaporation also increases. This is because evaporation occurs among the molecules on the surface, not in the interior. This means; increasing the surface area will increase the chance of more molecules to evaporate.

c. As temperature increases, rate of evaporation also increases. This is due to increasing kinetic energy of the surface molecules which leads them to free and become vapour.

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Answer 2

Answer:

(a) BLOWING AIR ON LIQUID SURFACE INCREASES RATE OF EVAPORATION: Blowing air takes away with it the molecules of liquid escaping out of the surface. To take their place, other molecules escape out from the surface of liquid.  

(b) SURFACE AREA INCREASES THE RATE OF EVAPORATION: On increasing the area of the surface, a number of molecules escaping out from the surface increases.

(c) INCREASE IN TEMPERATURE INCREASES THE RATE OF EVAPORATION: Increase in temperature increases K.E. (K.E = 1/2 Mv2). More and more molecules come to the surface of liquid hence the rate of evaporation will increase with an increase in temperature.

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