clean up & uniformity
[[chemical compound ]] is any substance that consists of two or more [[chemical element]]s always associated with one another in the same proportion, and that has certain properties deriving from that association that define and distinguish it from other substances.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
A compound is one example of a [[pure substance]]. (The other is a [[chemical element]].)
In general, polar solutes dissolve in polar solvents, and nonpolar solutes dissolve in nonpolar solvents. Ionic compounds (see above) typically dissolve only in polar solvents.
Molecular compounds are also either ''organic'' or ''inorganic''. [[Organic compound]]s contain carbon; inorganic compounds do not. Polyatomic ions may also be organic or
inorganic -- though an organic polyatomic ion is usually a dissociated weak organic acid of the form R-COOH, where R is the rest, or ''residue'', of the molecule.
== Descriptors of Compounds ==