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NotesChemistry HLTopic 5.2
Unit 5 · Reactivity 2: How much, how fast and how far? · Topic 5.2

IB Chemistry HL — How fast? The rate of chemical change

Topic 5.2 of IB Chemistry covers How fast? The rate of chemical change, which is part of Unit 5: Reactivity 2: How much, how fast and how far?. Students explore key concepts including Rate of reaction and collision theory, Factors affecting rate and the Maxwell–Boltzmann distribution, Rate equation, order and rate constant (HL), The Arrhenius equation and activation energy (HL). A strong understanding of how fast? the rate of chemical change is essential for IB Chemistry HL exams and builds the foundation for connected topics across the syllabus.

Higher Level students should use this topic hub as a map: start with the shared sub-topics, then follow the HL-only extensions and exam-skill links where this topic asks for deeper analysis.

Exam technique guidePractice questions

What you'll learn in Topic 5.2

  • 5.2.1 Rate of reaction and collision theory
  • 5.2.2 Factors affecting rate and the Maxwell–Boltzmann distribution
  • 5.2.3 Rate equation, order and rate constant (HL)
  • 5.2.4 The Arrhenius equation and activation energy (HL)
Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 5.2 How fast? The rate of chemical change

5.2.1

Rate of reaction and collision theory

Notes
5.2.2

Factors affecting rate and the Maxwell–Boltzmann distribution

Notes
5.2.3

Rate equation, order and rate constant (HL)

Notes
5.2.4

The Arrhenius equation and activation energy (HL)

Notes

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Topic 5.2 How fast? The rate of chemical change forms a core part of Unit 5: Reactivity 2: How much, how fast and how far? in IB Chemistry HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.

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5.1 How much? The amount of chemical change
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5.3 How far? The extent of chemical change
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