Question

Give reasons for the following

(a) Separation of gases from the air is a physical change.

Answer 1

Changes of matter can be classified into two, i.e physical and chemical changes.color

Physical changes	Chemical changes
Changes that involve with the physical properties like color, appearance etc..,	Changes that involve the chemical properties like nature of bonding, energy change etc..,
Generally, no new substances are formed	New substances are formed
It doesn't involve energy, heat change.	Involved with energy, and heat exchange.

(a) By analyzing the properties of physical and chemical changes, the separation of gases from the air is a physical change.

we can mix the separated gases and can get back to the original situation.

The gases are separated using fractional distillation, where the components are separated depending on boiling point difference which is a physical property.

Therefore, the separation of gases from the air is a physical change.