Matters can be classified into two types Pure substances and Impure substances.
Pure substances Pure substances are of two types Elements and Compounds.
Impure substances All mixture are considered as impure substances.
Most of the substances in our surroundings are not in their pure form and are called mixture. Substances which are made of two or more matters and which can be separated by physical methods are known as mixtures, such as mixture of salt and water, mixture of sugar and water, mixture of different gases, air, etc.
In a mixture, components do not combine chemically or through any chemical change. In a mixture, components do not lose their properties.
Mixtures are of two types on the basis of their composition - Homogeneous mixture and Heterogeneous mixture.
Mixtures which have uniform composition throughout are called Homogeneous Mixture. For example mixture of salt and water, mixture of sugar and water, air, lemonade, soda water, etc.
Mixture of salt in water is an example of homogeneous mixture. In this mixture, the boundary of salt and water cannot be differentiated. When a ray of light is passed through the mixture of salt and water, the path of light is not seen.
Mixtures which do not have uniform composition throughout are called Heterogeneous Mixture. For example mixture of soil and sand, mixture of sulphur and iron fillings, mixture of oil and water etc. The boundaries of constituent particles of a homogeneous mixture can be identified easily; as a homogeneous mixture has two or more distinct phases.
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