Question

17
14. Give reasons for the following observation :
(a) The smell of hot sizzling food reaches you
several metres away, but to get the smell from
cold food you have to go closer.
(6) Naphthalene balls disappear with time without
leaving any solid.
1
in
​

Answer 1

hey mate here is your answer.=

(1)=the small of hot sizzling food reached us several metres away because the diffusion of hot gases in air is faster that cold gases.

(2)= napthalene balls disappear with time because they keep subliming slowly and at last they sublime completely leaving no residue.

it will surely help you.

Answer 2

a) The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close because the kinetic energy of the particles of matter increases with the increase in temperature.

6)Naphthalene balls undergo sublimation due to which it converts directly into vapours and disappear into air without leaving any solid.