Mixtures
Mixtures can be classified under 2 types, homogeneous and heterogeneous. Homogeneous mixtures all look the same, and heterogeneous mixtures have either visibly different parts or layers.
The other two types of mixture can both be put under the category of heterogeneous mixtures. In these kind of mixtures, two or more pure substances are together, but with visibly different parts. In heterogeneous mixtures, you will be able to see at least two different parts. The category of heterogeneous mixtures can be further divided into two parts:
Suspension
Mixture in which particles of one substance settle to the bottom. Examples: Italian Dressing, Water and Oil |
Colloid
Mixture in which the different parts can be seen, but the particles do not separate and settle out. Some colloids particles are sometimes small enough they cannot be seen to the unaided eye. These particles can be detected however by scattering light due to the Tyndall effect. Examples: Fog, Concrete, Gravel, Sand |