Students investigate how temperature, concentration, and surface area affect the speed of a chemical reaction.
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Teach: rate, collision, concentration, surface area, temperature, catalyst, enzyme, particle. The phrase more collisions per second is the mechanistic link between each factor and the increased rate.
Focus on one factor — temperature — and establish the collision theory explanation before testing other factors.
Can students explain how increasing temperature affects reaction rate in terms of particle collisions? Can they predict how changing concentration would affect the same reaction?
Vinegar and bicarbonate of soda are cheap and widely available. Hot and cold water demonstrate temperature effects.
Students sometimes think catalysts are used up in the reaction. A true catalyst is regenerated at the end — it lowers the activation energy without being consumed.
Reaction rate chemistry is essential for chemical engineering, cooking, medicine, and environmental science.
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