<ref>A compound is a substance with a fixed ratio of elements which determines the composition, and a particular organization which determines chemical properties. [http://www.newworldencyclopedia.org/entry/Chemical#Compounds New World Encyclopedia] </ref> | <ref>A compound is a substance with a fixed ratio of elements which determines the composition, and a particular organization which determines chemical properties. [http://www.newworldencyclopedia.org/entry/Chemical#Compounds New World Encyclopedia] </ref> |