pure substance-Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together).
mixture-a substance made by mixing other substances together.
Homogeneous Mixture: A mixture which has uniform composition and properties throughout. For example, air is a homogeneous mixture of gases. A teaspoonful of table salt stirred into a glass of water also makes a homogeneous mixture.
A suspension is a heterogeneous mixture in which solute-like particles settle out of a solvent-like phase some time after their introduction
A colloid is a homogeneous solution with intermediate particle size between a solution and a suspension. Colloid particles may be seen in a beam of light such as dust in air in a "shaft" of sunlight. Milk, fog, and jello are examples of colloids. In contrast a suspension is a heterogeneous mixture of larger particles.
