Compound

compound
A compound is a substance which is made up of two or more elements chemically combined in a fixed proportion by ratio.

Example - Water(H2O) is a compound made up of two elements H (Hydrogen) and O2 (Oxygen) in a fixed proportion of 1:8 by weight.

Properties

 * 1) Compound can't be seperated by physical method.
 * 2) Property of compounds is entirely different from their constituent particles.
 * 3) Energy is usually either given out or absorbed in the formation of compounds.
 * 4) Formation of compounds is a chemical changes.
 * 5) Composition of compounds are fixed, the constituent particles are present in a fixed proportion by weight. Each compound have a definite formula.
 * 6) They have fixed melting and boiling point.
 * 7) A compound is a homogeneous mixture.