Question

Account for the following: (A) Sand is a solid.
(B) Rate of evaporation of a liquid increases with temperature

Answer 1

A) sand is a solid because it has a fixed shape and volume at room temp. the problem is only that it's size is very small.

B) rate of evaporation of a liquid increases with temperature because as the temp. is high the kinetic energy increases so the molecules move faster which helps them to change into vapour.

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Answer 2

A). Sand is a solid because it has a fixed shape and volume. It is very small but its particles are closely packed.
B). Rate of Evaporation increases with increase in temperature because the kinetic energy increases and gets enough energy to change into vapour state. The rate of evaporation is maximum pn its boilng point.

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