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2 or more atoms joined in a chemical bond, bond can be ionic (metal/nonmetal) or covalent (nonmentals)
attraction between substances (molecule, atom, etc) of the SAME kind. Ex: water attracts other water molecules. Also gives rise to surface tension
attraction between substances of DIFFERENT kinds
Ex: water is attracted to the walls of a tube (this gives rise to capillary action)
mixture where 2 or more substances are EVENLY mixed Ex: salt water, brass (Zn + Cu; don't have to be liquid)
monomer of proteins; only 20 of them, all living orgs use the same ones (except weird ones in bottom of ocean)
energy needed to start a chemical reaction...all reactions need activation energy (some more than others)
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