EVERYDAY SCIENCE

Detailed explanation-1: -Matter that always has exactly the same composition is classified as a pure substance. Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.

Detailed explanation-2: -Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.

Detailed explanation-3: -All elements are mostly 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.

Detailed explanation-4: -Pure substances are mostly homogeneous in nature containing only one type of atom or molecule. It consists of a single type of particle and is the same in chemical nature.

Detailed explanation-5: -A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.