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How does an iodine clock reaction work?    Please provide the certain chemicals and the reaction that occurs in this process. 

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The iodine clock reaction is a type of clock reaction, or a reaction that has a delayed visual response due to the kinetics of the reactions taking place.  There are several different types of iodine clock reactions, but they all rely on the fact that the iodide anion (I-) is colorless while elemental iodine (I2) is highly colored.  The most common type of iodine clock reaction involves hydrogen peroxide, potassium iodide, and sodium thiosulfate.

In the reaction, a solution of...

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