Question

State three reasons that prove that air is a mixture.

Answer 1

Air is a mixture because of the following reasons -

1. It lacks a formula; a mixture lacks a formula, whereas a compound does.
2. There are no energy changes involved in the formation of air from various gases.
3. There is no change in mass or volume when air is formed from its constituents.
4. The properties of air vary from place to place and over time. In other words, towns have more ${\mathrm{CO}}_2$ than villages, which have more oxygen than towns.
5. Simple physical methods can be used to separate air components.