Overall Reaction First propagation step H H-CCH H-CI chlorine atom methyl radical hydrogen chloride Second propagation step H H H-C. H-C-CI H H methyl radical chlorine molecule chloromethane chlorine atom H-C—H+CI-C heat or light H-CI H H methane chlorine chloromethane hydrogen (methyl chloride) chloride n 2013 Pearson Education,Inc. Chapter 4 9© 2013 Pearson Education, Inc. Overall Reaction Chapter 4 9