Presentation+Outline

What I would hook the grade 9's with!

This reaction has been said to induce a hypnotic state among its observers when coupled with intense electronic house and techno style music playing at a high amount of decibels. The intense bass and the vibrant colour change work together to ease the mind into a highly focused and suggestible state. Watch the colours... Listen to the music... think about all the reactions taking place in this tiny reaction vessel!

media type="file" key="Briggs-Rauscher.mov" width="300" height="300" THIS IS MY MOVIE!

The science I would tell the grade 9's afterwards! The actual science behind the Briggs-Rauscher reaction is relatively complex. The basic principle of an oscillating clock reaction is as follows: In an oscillating clock reaction there are a few smaller reactions that take place. Initially, the reaction can follow one of two pathways. One pathway produces a specific product (in this case iodide) and the other pathway consumes it. When the concentration of iodide is low (initially), one reaction produces iodine at a very rapid rate causing the solution to turn blue. Eventually the other reaction consumes all of this free iodine and produces iodide stopping the production of free iodine and slowly turning the solution clear. Eventually the concentration of the iodide becomes low enough once again from a different reaction for the fast iodine producing reaction to start and suddenly turn the solution blue again.