Matter around us 1 big

Question 1

Explain why solids have fixed shape but liquids and gases do not have fixed shape.

Answer 1

Solids have fixed shapes due to the strong intermolecular forces of attraction between them.- The liquids and gases have molecules with the less intermolecular force of attraction- so they take the flow and shape of the container.

Question 2

Why is water liquid at room temperature?

Answer 2

At room temperature, the particles of water have some intermolecular force of attraction- and the room temperature cannot provide sufficient heat for these molecules- to overcome their force of attraction and therefore remain in the liquid phase.

Question 3

How is the high compressibility property of gas useful to us?

Answer 3

(1) LPG (liquefied petroleum gas) is a fuel that is made up of petroleum gas. On compressing this petroleum gas it forms a liquid.
(2) Oxygen cylinders in the hospitals have compressed gas filled in them.
(3) CNG (compressed natural gas) is a natural gas which is compressed and used as fuel in vehicles and at home.