Question

1. Explain why?
i. A gas fill a vessel completely.
ii. Camphor disappears without leaving any residue.
iii. The temperature does not rise during the process of melting and boiling,

through heat energy is constantly supplied.
iv. Water stored in an earthen vessel becomes cool.
v. An iron almirah is a solid at room temperature.

2. Which phenomenon occurs during the following changes?
i. Wax melts in the sun.
ii. Drying of wet clothes

iii. Formation of clouds

3. Why does the temperature of a substance remain constant during its melting point or boiling point?

Answer 1

Answer:

1 i.a gas fill a vessel completely bcoz there iz negligible force of attraction between d particles

ii.camphor disappears without leaving a residue Bcoz it is a sublime substance

iii the temp. does not rise during d process of melting nd boiling bcoz extra amount of heat iz used 2 break up d molecular bonding

Answer 2

Answer:

1 i.a. gas fill a vessel completely bcoz there is negligible force of attraction between d particles

ii. Camphor disappears without leaving a residue Bcoz it is a sublime substance

iii the temp. does not rise during d process of melting nd boiling bcoz extra amount of heat iz used 2 break up d molecular bonding