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IB Chemistry SL 2.2.2 Collision Theory Questions

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

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

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 SL 2.2.2 Collision Theory Questions question 1

[Maximum number: 3]

A purple solution of potassium manganate( VII),KMnO4), \mathrm{KMnO}_{4}, reacts with ethanedioate ions according to the following equation.

2MnO4−(aq)+5C2O42−(aq)+16H+(aq)→10CO2( g)+2Mn2+(aq)+8H2O(l)2 \mathrm{MnO}_{4}^{-}(\mathrm{aq})+5 \mathrm{C}_{2} \mathrm{O}_{4}^{2-}(\mathrm{aq})+16 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 10 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{Mn}^{2+}(\mathrm{aq})+8 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

Discuss, in terms of collision theory, the effect of increasing temperature on the rate of this reaction.

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