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Science presenter Jon Chase briefly outlines collision theory and then describes four ways to increase the rate of a reaction. The effect of concentration is demonstrated using an iodine clock reaction. The effect of temperature is demonstrated using a glowstick. The effect of a catalyst is demonstrated using hydrogen peroxide and manganese(IV) oxide. The effect of particle size is demonstrated using the combustion of sugar.
This clip is from:
First broadcast:
11 May 2012

Classroom Ideas

This clip could be used as an introduction to rates of reaction. Following the clip, ask students to summarise their understanding of this important topic using a poster or a series of role-plays which could be peer-assessed. Students could complete practical investigations into the effect of temperature, concentration, particle size or catalysts. The iodine clock demonstration can be used to demonstrate the effect of changing concentration or temperature. Search online for ‘RSC CCD iodine clock’.