Basic objective of this lecture is to describe on Basic Chemistry. Here explain matter, compounds and atoms in terms of basic chemistry. Matter is any material substance with Mass and Volume. It comes in 3 phases: Solid, Gas and Liquid. Compounds means two or more elements chemically combined to form a new substance with new properties. Atoms are the basic unit of chemistry. They consist of 3 smaller things: Protons, Electrons and Neutrons.