Question

What are the examples of pure and impure substances?

Answer 1

A pure substance is made of only one type of molecule. Distilled water is a simple example.
Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.

Answer 2

Explanation:

Pure substances are defined as the substances which have same chemical composition and characteristic properties. The particles cannot be separated by any physical means. Elements and compounds are considered as pure substances. For Example: Sodium (Na), $CO_2$ etc...

Impure substances defined as the substances which down not have same chemical composition. These can be easily separated by physical techniques. Mixture of elements, mixture of compounds and mixture of elements and compounds are considered as impure substances. For Example: Mixture of Sodium and calcium is an impure substance, Mixture of water and sugar is an impure substance.