9th Class Science Ch-2 Is Matter around us Pure?

In this article, we will discuss ‘Is matter around us pure?’ from 9th Class Science. We all know that all the matter around us is not pure. There are two types of Matter – pure substances and mixtures. We will discuss both in detail.

Impure substances: Mixtures

A mixture is one which contains two or more different kinds of particles. The Mixture contains two or more pure substances and mixed together. All the mixtures are impure substances.

E.g.: – Salt solution, milk, sea water, biogas, tea, coffee.

A mixture can be homogeneous and heterogeneous. It can be separated into other kinds of matter by a physical process. It does not have a fixed composition or fixed melting or boiling point.

Most of the matter around us exists as mixtures of two or more pure substances.

From the above discussion, we can conclude all the matter can be divided into three classes: Elements, compounds, and mixtures.

Pure Substances: Elements and compounds

A pure substance is one which is made up of only one kind of particles. A pure substance is one which is made up of only one kind of atoms or molecules. All the elements and compounds are pure substances because they contain only one kind of elements.

E.g.: -Iodine, mercury, silicon, iron, copper, bromine.

All compounds such as water, sodium hydroxide, nitric acid are pure substances.

A pure substance is homogeneous throughout its mass. It cannot be separated into other kinds by any physical process.

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