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IB Chemistry HL 2.2.4 Activation Energy Ea Questions

Use real HL exam distributions to identify activation energy and explain how temperature or catalysts change the reacting fraction.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Draw or label catalysed and uncatalysed activation energies on a Maxwell–Boltzmann distribution or energy profile.
  • Sketch Maxwell–Boltzmann curves for different temperatures, showing the higher-temperature distribution shifted toward higher kinetic energy.
  • Use the area beyond Ea or relative curve positions to explain how temperature and catalysts change the reacting fraction.

Learn this topic

Study 2.2.4—Activation energy (Ea) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.4 Activation Energy Ea Questions question 1

[Maximum number: 1]

When nitrogen gas and hydrogen gas are allowed to react in a closed container the following equilibrium is established.

N2( g)+3H2( g)⇌2NH3( g)ΔH=−92.6 kJ\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \quad \Delta H=-92.6 \mathrm{~kJ}

Define the term activation energy, EaE_{\mathrm{a}}.

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