IB Chemistry SL 2.2.5 Catalysts Questions

Use real SL exam questions to explain homogeneous, heterogeneous and enzyme catalyst mechanisms and their lower-energy pathways.

Exam points

Explain homogeneous catalysis through an intermediate or activated complex and an alternative pathway with lower activation energy.
Describe heterogeneous catalysis through adsorption on a surface, weakened bonds, an alternative pathway and product desorption.
Use a Maxwell–Boltzmann distribution to explain how lowering activation energy increases the fraction of particles able to react, without changing the final equilibrium.

[Maximum number: 2]

Describe how a catalyst increases the rate of a reaction.

Provides an alternative pathway of lower energy.

Lowers activation energy of the reaction / more particles have $E \geq E_{\mathrm{a}}$ .

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