Question

Define two types of pure substances. Give three examples of each.

Answer 1

Pure substance:

1. A pure substance is a substance that has a single type of particle having the same chemical nature.
2. It is further classified into two types: elements and compounds.

Elements:

1. A pure substance that can neither be reduced further nor can be formed by physical or chemical methods and is made up of same type of atoms.
2. Example - Iron $\left(\mathrm{Fe}\right)$, Nitrogen $\left(\mathrm{N}\right)$, Boron $\left(\mathrm{B}\right)$.

Compounds:

1. It is a substance that is formed by mixing two or more elements in a defined ratio.
2. Example - Methane $\left({\mathrm{CH}}_4\right)$, carbon dioxide $\left({\mathrm{CO}}_2\right)$, steam $\left({\mathrm{H}}_2\mathrm{O}\right)$.