This applet is designed for study of the kinetics of chemical reactions. It uses a model gas of three atomic species to illustrate the formation and disassociation of the different possible diatomic molecules. The user can run experiments with either one of each atom type or a gas of many atoms, controlling the density of the various species, the temperature, and energetics of the reaction.  Data collection tools are available to calculate rate coefficients. Tips for teachers, ideas and activities are included. The direct link to the simulation is given as a mirror URL.

This is part of a larger collection developed by the Physics Education Technology project (PhET).

Please note that this resource requires Flash.