Question

Give reason 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

Explanation:

Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.

Answer 2

Answer:

a)naphthalene ball changes from solid to gas without intervention of liquid state

b)When perfume is released it quickly changes into vapour. The kinetic energy of gas molecules is high & the rate of diffusion is high.

Explanation: