We describe the energy and angle distributions of reflected Cl-2 molecules and Cl atom fragments obtained from molecular dynamics (MD) simulations of Cl-2(+) ion impacts onto a chlorinated silicon surface. We simulated Cl-2+ ion impacts onto a silicon surface with 1 monolayer (ML) of adsorbed Cl atoms. The ion incident energies E-i were 20, 50, and 100 eV. We varied the ion incident angles theta(i) from 0 degrees to 85 degrees from the surface normal. We report the Cl-2 dissociation probability, as well as the scattering probabilities for both the Cl-2 molecules and the Cl atom fragments. The effects of E-i and theta(i) on these quantities are discussed. For the 100 eV Cl-2(+) impacts with theta(i) greater than or equal to 75 degrees, we describe the distributions of energies E-r. and angles (polar theta(r) and azimuthal phi(r)) for the reflected Cl-2 molecules and Cl atom fragments. In addition, we compare the average energies of the reflected molecules and atoms with the predictions of two simple models based on the binary collision approximation.