Nucleophilic Substitution - SN2

One of a series of videos extracted from a Flash project (unfinished) that will eventually cover all the Mechanisms met in the Advanced Chemistry course as taught in Scottish Schools. http://new.chemistry-teaching-resources.com/Mechanisms.html. This video is the third of 3 looking at Nucleophilic Substitution. It considers the SN2 mechanism in which the nucleophiles and the halogen are both attached and a trigonal bipyramidal intermediate forms - Second Order Kinetics.