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.