Is Matter around us Pure- Notes

Types of Substances 

A change in the physical appearance but not its chemical composition is known as physical change.

A change in which a substance changes into a chemically new substance is referred to as a chemical change.

A substance which is made up of one kind of particle is referred to as a pure substance.

A substance which contains two or more different kinds of particles is known as a mixture.

An element is a substance or a piece of matter that is made of only one kind of atom.