8 Reaction kineticsAS Level

8.3 Homogeneous and heterogeneous catalysts

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Lessons

What a catalyst really doesA catalyst speeds a reaction by providing a different mechanism with a lower activation energy, without being used up and without changing ΔH. 6 min, not started
The catalytic effect on a Boltzmann distributionA catalyst leaves the distribution alone and lowers the threshold, so a much larger fraction of molecules has enough energy to react. 6 min, not started
Reaction pathway diagrams with and without a catalystRead and sketch energy profiles for catalysed reactions: same start and finish, lower humps, an intermediate in between. 7 min, not started
Homogeneous and heterogeneous catalysisSame phase or different phase? That one difference decides how the catalyst meets the reactants, and what limits its performance. 7 min, not started

Syllabus objectives

1 objective

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

8.3.1

Explain and use the terms catalyst and catalysis: (a) explain that, in the presence of a catalyst, a reaction has a different mechanism, i.e. one of lower activation energy; (b) explain this catalytic effect in terms of the Boltzmann distribution; (c) construct and interpret a reaction pathway diagram for a reaction in the presence and absence of an effective catalyst.

Taught in: The catalytic effect on a Boltzmann distribution, Reaction pathway diagrams with and without a catalyst, What a catalyst really does, Homogeneous and heterogeneous catalysis · 24 questions