In this investigation of reaction kinetics, learners alter the amount of iodate solution mixed with the same amount of starch solution. Visitors observe the solutions to see which concentration of iodate reacts the most quickly. Learners come to understand that the speed of a chemical reaction is dependent on the concentration of the chemicals involved. This activity is currently used in the Chemical Reactions Unit in OMSI's Chemistry Lab. Cost estimates are per 100 learners. For safety reasons, this activity is best conducted as a demonstration for younger audiences.