Compounds

Mixtures

The composition of a new substance is always fixed.

The composition of a mixture varies.

Elements react to form new compounds.

Elements or compounds just mix

to form a mixture and no new compound is formed.

The new substance has entirely new properties.

The properties of the constituent substances are displayed in a mixture.

Only chemical or electrochemical reactions can separate the constituents.

Physical methods can be used to separate the constituents fairly easily.