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IB Chemistry HL 2.2.5 Catalysts Questions

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

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

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.
  • Explain enzyme catalysis through substrate binding at a specific active site and a lower-energy pathway.

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Study 2.2.5—Catalysts conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.5 Catalysts Questions question 1

[Maximum number: 2]

Nitrous acid, HNO2\mathrm{HNO}_{2}, is a weak acid which can be used to make acidic buffers.

A catalyst, usually concentrated sulfuric acid, H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}, is used in the manufacture of this ester.

Explain the action of a catalyst.

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