Question

Give reasons for the following observations:-
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away. ​

Answer 1

Answer:

a. because they are sublime. they directly turn into gaseoues state. they are volatile.

b. because particles of matter are continously moving.

Explanation:

Answer 2

While the first statement follows principle of sublimation, the second follows vapourisation.

• The correct reasons are -

a) Sublimation is a procedure that refers to the transition of naphthalene from solid to gas without the need of liquid.

• As a result, the active balls continue to efficiently generate vapours, which promptly vanish into atmosphere slowly, thereby typically with no residue left behind.

b) When perfume is properly discharged, it rapidly evaporates. Gas molecules have a significant kinetic energy and a rapid rate of diffusion. Thus, one can smell the scent from a distance of several meters.