J.R. S. answered 08/16/20
Ph.D. University Professor with 10+ years Tutoring Experience
There are two types of equilibrium: dynamic equilibrium and static equilibrium.
Dynamic equilibrium: reactants are converted to products and products are converted back to reactants at an equal and constant rate. In this case neither the forward nor the reverse reaction stops at equilibrium.
Static equilibrium: all the particles in the reaction (reactants and products) are at rest and there is now further interconversion. In this case, both the forward and reverse reaction stop at equilibrium. An example of this would be C(diamond) <==> C(graphite)