Question

What is meant by a pure substance? Give examples.

Answer 1

Hint – In this question is the basic definition of pure substance that a substance is termed as a pure substance if and only if it is made up of only one type of atom or molecule.

Complete answer:

The qualities of pure substance are given below:
$\left( 1 \right)$ The substance that is free from any kind of mixture.
$\left( 2 \right)$ And it contains only one kind of particle.
$\left( 3 \right)$ The physical properties of a pure substance include well-defined melting and boiling points.
Are called as pure substances.
The purity of a substance is the measure of the extent to which a given substance is pure.
For example:
Gold, silver, aluminum and iron.
The chemical formula of these elements are gold (Au), silver (Ag), aluminum (Al) and iron (Fe).
24 – Karat gold is the purest form of gold.
So this is the required answer.

Note – Important characteristics of pure substance always help in solving problems of this kind. A pure substance has a constant composition and cannot be separated into a simpler substance by physical means. There are two types of pure substances that are elements and compounds. Atoms of the same elements are identical in properties.