Are the bicentennial quarters the ones with different states on them?

No! Bicentennial quarters are all from 1976 and have a different 'tail' side that has a drummer in a tricorn hat instead of the eagle. The date on the front also will say 1776-1976 under G.W.'s head.

Here is a great link that has a picture of a bicentennial quarter on it if you scroll partway down (see Related Links).