Chemistry

A compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components, a compound can not.

Compounds
Compounds are pure substances.They are made up of two or more elements combined chemically.The constituents of a compound are present in a fixed ratio.Compounds have fixed properties. For example, a particular compound will have fixed temperatures at which it melts and boils.A compound can have properties different from its constituents, as a new substance is formed when the constituents are chemically combined.The constituents of a compound can be separated only by chemical methods.
Mixtures
Mixtures are impure substances.They are made up of two or more substances mixed physically.The constituents of a mixture are present in varying ratios.Mixtures do not have fixed properties. Their properties depend on the nature of their components and the ratios in which they are combined.In mixtures, no new substance is formed. The properties of a mixture are the same as the properties of its constituents.The constituents of a mixture can be separated easily by physical methods.
http://wiki.answers.com/Q/What_is_the_difference_between_a_compound_and_a_mixture

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Mixtures are heterogeneous forms of matter. Mixtures are composed of variable proportions of molecules and atoms.Compounds are homogeneous forms of matter. Their constituent elements (atoms and/or ions) are always present in fixed proportions (1:1 depicted here).

圖片參考：http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/mixture.gif
Examples of mixtures:soilocean water and other solutionsairthe cytosol of a cellExamples of compounds:water (H2O)table salt (NaCl)sucrose (table sugar, C12H22O11)
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mixtures.html

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