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Element
It cannot be broken down into simpler substance, nor can it be prepared by the combination of two or more simpler substances.
Metal and nonmetal
Two main groups of elements.
Compound
It can be formed from two or more elements chemically combined in definite proportions by weight. The composition of a compound may be altered by chemical means.
Pure substance
The unchanging composi tion of elements and compounds are said to be ____ _____.
Impure substance
Mixtures having a different composition are called _____ ______.
Homogenous mixture
It has a consistent composition throughout, meaning that the individual components are not easily distinguishable.
Heterogeneous mixture
It contains visibly different components that can be easily identified and separated.
Solution
It is a homogeneous mixture of two components: the solvent, which makes up the bulk of the solution, and the solute, which the solvent dissolves.
Suspension
It is a type of heterogeneous combination in which the solid particles float (suspended) throughout the solvent rather than dissolving.
Colloids
They are any material made up of particles that are too small to be seen with the naked eye but much larger than atoms or regular molecules.
Note 
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