IB Chemistry SL Reactivity 2.2.5 Catalysts

Practise explaining catalysts through a changed mechanism with a lower activation-energy pathway. Show the lower Ea on energy or Maxwell–Boltzmann diagrams, connect it to a…

Syllabus
First assessment 2025
Objective
2.2.5
Level
SL

Exam points

  • state that a catalyst changes the mechanism by providing a lower-Ea pathway
  • show catalysed and uncatalysed activation energies without changing the distribution curve
  • explain the rate increase through a larger fraction of particles with energy at least Ea

2.2.5—Catalysts question 1

[Maximum number: 2]

Describe how a catalyst increases the rate of a reaction.

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