None of the Bicentennial coins with the dual date 1776-1976 made for general circulation contain any silver or are worth more than face value. Only Proof and collectors coins sold from the US Mint are worth more.
A lot of coins say E Pluribus Unum. If the date says 1776-1976, it's a bicentennial quarter, half dollar, or dollar. Whichever coin you have, it's worth face value.