Chemical Elements-These are defined as ‘Substances which cannot be broken down into Simpler Substances by chemical means’

Chemical Compounds - These are formed from a chemical combination of two or more Elements in definite proportions. Water is a compound of Hydrogen and Oxygen gases and, water has many different properties to those of the gases of which it is composed.

The list of compounds found on earth is almost endless. Compounds cannot be separated by mechanical means - only by chemical reaction