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IB Chemistry HL 2.2.2 Collision Theory Questions

Use real HL exam questions to explain successful collisions through energy, orientation and temperature effects.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • State that a successful collision requires kinetic energy at least equal to the activation energy and a suitable orientation of reactant particles.
  • Explain how temperature changes collision frequency and the fraction of particles with energy at least equal to activation energy.
  • Use collision theory to relate molecular kinetic energy, collision frequency and orientation to a change in reaction rate.

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Study 2.2.2—Collision theory conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 2.2.2 Collision Theory Questions question 1

[Maximum number: 2]

Sulfur trioxide is an important compound in industry.

SO3( g)\quad \mathrm{SO}_{3}(\mathrm{~g}) is made using the contact process.

2SO2( g)+O2( g)⇌2SO3( g)ΔH⊖<02 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g}) \quad \Delta H^{\ominus}<0

Explain why increasing the temperature increases the rate of reaction.

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