In this work we report results for the scattering of H-2 molecules fro
m a system showing dissociative adsorption. We compare the results of
time-dependent quantum wavepacket calculations with those obtained usi
ng classical mechanics. It is found that the trends in the scattering
dynamics are broadly accounted for by the classical simulations. A not
able exception to this is found for initial molecules having non-zero
angular momentum.