Category Archives: 1.5 Kinetics (AS)

Catalysts (kinetics, AS)

Definition A catalyst is a substance that increases the rate of a chemical reaction without being changed in chemical composition or amount. Catalysts work by providing an alternative reaction route of lower activation energy. Students should be able to use a Maxwell–Boltzmann distribution to help explain how a catalyst increases the rate of a reaction involving a gas.

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Effect of concentration and pressure

The qualitative effect of changes in concentration on collision frequency. The qualitative effect of a change in the pressure of a gas on collision frequency. Students should be able to explain how a change in concentration or a change in pressure influences the rate of a reaction. Assessment and practical opportunities Students could investigate the effect of changing the concentration of acid on the rate

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Effect of temperature on reaction rate

Meaning of the term rate of reaction. The qualitative effect of temperature changes on the rate of reaction. Students should be able to: • use the Maxwell–Boltzmann distribution to explain why a small temperature increase can lead to a large increase in rate. Assessment and practical opportunities  Students could investigate the effect of temperature on the rate of reaction of sodium thiosulfate and hydrochloric acid by an

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