Closed and open FRW cosmologies with matter creation: kinematic tests

The limits imposed by the classical cosmological tests on closed and open F RW universes driven by adiabatic matter creation are investigated. Exact ex pressions for the lookback time, age of the universe, luminosity distance, angular diameter, and galaxy number counts Versus redshift are derived and their meaning discussed in detail. An interesting consequence of these cosm ological models is the possibility of an accelerated expansion today (as in dicated from supernovae observations) with no need to invoke tither a cosmo logical constant or an exotic "quintessence" component.