A printer would be useful for recording the results of the simulations in this 'O' level chemistry revision program dealing with the rate of reactions. If you choose Revisions Notes, information is given a little at a time, and you must run side two to answer questions posed about the two simulations.

A graph of evolution of oxygen against time from hydrogen peroxide is shown, followed by clues to its interpretation. Then, using a collision model, the effects of concentration, temperature and pressure upon particles is shown. Other factors are mentioned and graphically explained, followed by the definition of a catalyst.

Side two offers simulations of the decomposition of hydrogen peroxide and the reaction of marble chips with hydrochloric acid. The former allows choice of temperature, catalytic mass, concentration and volume of hydrogen peroxide and time. Then the experiment runs, followed by options including tabulation and plotting of results. Similarly with experiment two, where carbon dioxide bubbles match plots on the graph, shown on screen, which can be printed.

A simplistic program making use of some of the interactive potential of the computer.

T.W.