Question

How is matter classified on the basis of chemical constitution?

Answer 1

The matter is classified as a pure substance and mixture on the basis of chemical composition.

Pure substances: When only one type of constituent particles are present in the substance.

• Example: Substances like Copper $\left(\mathrm{Cu}\right)$, Iron $\left(\mathrm{Fe}\right)$ etc. and substances like Water $\left({\mathrm{H}}_2\mathrm{O}\right)$, Hydrogen chloride $\left(\mathrm{HCl}\right)$

Mixture: When two or more substances (elements or compounds or an element and compound) are mixed in any proportion.

• The components of a mixture can be separated by physical methods of separation.
• Example: A mixture of Sand and Iron $\left(\mathrm{Fe}\right)$ can be separated by the use of a magnet (physical process) where Iron gets attracted to the magnet leaving behind the sand.