EVERYDAY SCIENCE

Detailed explanation-1: -Pure substances: Graphite, Diamond, Distilled water, Oxygen, Iron, Sodium chloride, 22 carat gold. Mixtures : Air, Milk, Gasoline, Tap water, One rupee coin, Steel, Iodised table salt.

Detailed explanation-2: -Although air is a mixture consisting of roughly 78% of nitrogen, 21% of oxygen, and trace amounts of other gases and moisture, air is homogeneous and has distinct properties without phase changes in its composition in many thermodynamic processes. In such conditions, we can treat air as a pure substance.

Detailed explanation-3: -A mixture which has uniform composition and properties throughout is known as homogeneous mixture. Air is a homogeneous mixture of gaseous substances such as nitrogen, oxygen, and small amounts of other substances.

Detailed explanation-4: -Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Air is a mixture of different gasses like N2 (78%), O2(21%), argon (1%), carbon CO2 (0.03%), and water vapor. The composition of these gasses is not fixed.

Detailed explanation-5: -Examples of Pure Substances A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.