IB Chemistry SL Reactivity 2.2.4 Activation Energy

Practise treating activation energy as the minimum collision energy required for reaction. Label Ea on energy or Maxwell–Boltzmann diagrams, compare the area beyond the threshold…

Exam points

label activation energy on the kinetic-energy axis or from reactants to a profile maximum
sketch a lower-temperature distribution with a taller, left-shifted peak and smaller tail
compare successful-collision fractions using the area of each curve beyond Ea

[Maximum number: 2]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

Figure for Question 2.2.4—Activation energy (Ea) question 1 — IB Chemistry SL

(a)

Sketch the Maxwell-Boltzmann distribution curve for 298 K on the same axes as the 900 K curve.

Figure for Question (a) — IB Chemistry SL

[ 1 ]

(b)

Annotate the graph to show the activation energy, $E_{\mathrm{a}}$ .

[ 1 ]

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2.2.4—Activation energy (Ea) question 1

Question (a)

Question (b)