IB Chemistry SL 2.2.2 Collision theory Question Bank

Practise IB Chemistry SL 2.2.2 by applying collision theory to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 3]

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

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.

(rate increases due to)
increase in (average) kinetic energy/speed of the particles; increase in frequency of collisions/collisions per unit time; greater proportion/number of particles have energy $\geq E_{a}$ ;

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2.2.2—Collision theory question 1