HCtH Propagation Step (1) H The chlorine atom collides with a methane molecule and abstracts (removes)a H, forming another free radical and one of the products(HCI). H H-C H-CI => Chapter 4 6Chapter 4 6 Propagation Step (1) The chlorine atom collides with a methane molecule and abstracts (removes) a H, forming another free radical and one of the products (HCl). C H H H H + Cl C H H H + H Cl =>