IB Chemistry SL Reactivity 2.2.2 Collision Theory

Practise explaining reaction rate through the frequency and success of particle collisions. A reaction requires suitable orientation and collision energy at least equal to…

Syllabus
First assessment 2025
Objective
2.2.2
Level
SL

Exam points

  • state that a collision needs both suitable orientation and energy at least equal to Ea
  • explain concentration or pressure effects through collision frequency per unit time
  • explain temperature effects through faster collisions and a larger fraction above Ea

2.2.2—Collision theory 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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