Question

(a) What is sublimation ? Give an example of substance which sublime.
(b) What happen when acetone is poured on the palm ?

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

(a) Sublimation : Sublimation is the change of a solid directly into the gaseous state without passing through the liquid state upon heating and back to the solid state when the temperature is lowered. Napthalene is a sublime substance.
 (b) It will evaporate taking latent heat of vaporization from the palm.

Answer 2

Answer:(a) Sublimation : Sublimation is the change of a solid directly into the gaseous state without passing through the liquid state upon heating and back to the solid state when the temperature is lowered. Napthalene is a sublime substance.

 (b) It will evaporate taking latent heat of vaporization from the palm.

Explanation: