Catalysts in industry
3 marks · EasyDraw a fully labelled reaction profile diagram for a reaction that is exothermic, showing the effect of a catalyst.
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Must show: y-axis labelled as energy, x-axis labelled as progress of reaction, energy of reactants marked above products, products at lower energy than reactants (exothermic), two activation energies shown (catalysed and uncatalysed), both labelled, enthalpy change (ΔH) labelled, all labels clear
Also accept: Diagram with correct layout and labels but with slightly different positions.
Common mistakes: Not labelling axes.; Not showing both activation energies.
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Marking points
B1 (a) · 1 mark · Axes labelled correctly, and energy levels for reactants and products shown (reactants above products: exothermic).
B2 (a) · 1 mark · Both catalysed and uncatalysed activation energy curves drawn and both activation energies labelled.
B3 (a) · 1 mark · Enthalpy change (ΔH) labelled and shown as the difference between reactants and products.
Worked solution