IB Chemistry SL Reactivity 1.1.3 Stability and Energy Profiles

Practise sketching and interpreting reaction energy profiles with reactants, products, activation energy and ΔH labelled correctly. Compare relative stability from potential…

Exam points

draw reactant, product and transition-state levels for the stated enthalpy sign
label activation energy from the reactant level to the correct curve maximum
show a lower catalysed barrier while keeping reactant, product and ΔH levels unchanged

[Maximum number: 3]

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

Figure for Question 1.1.3—Stability and energy question 1 — IB Chemistry SL

The forward reaction is endothermic, uses iron(III) oxide as a catalyst, and takes place at 900 K .

Sketch the energy profile for the reaction, both with and without the catalyst, labelling $\Delta H$ and the activation energies.

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1.1.3—Stability and energy question 1