IB Chemistry SL 1.1.3 Stability and Energy Questions

Use real exam questions to draw and interpret labelled energy profiles, compare reactant and product stability and identify activation energy.

Exam points

Draw and label an energy or enthalpy profile with reaction progress, reactants, products and the sign or magnitude of ΔH.
Interpret relative reactant and product energy levels to deduce endothermic or exothermic change and which side is more energetically stable.
Label or compare activation energy and the energy barrier on a potential-energy profile, including profiles with and without a catalyst where shown.

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Study 1.1.3—Stability and energy conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

Figure for Question IB Chemistry SL 1.1.3 Stability and Energy Questions 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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IB Chemistry SL 1.1.3 Stability and Energy Questions question 1