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AQA · GCSE · Chemistry · Higher

Catalyst effect on reaction profile

Q02.5 1 mark

Figure 2 represents the reaction profile of the catalysed reaction between ammonia and oxygen.

Figure 2
Figure 2

Figure 2

Enlarged question image

Figure 2

How would Figure 2 be different if no catalyst was used? Tick one box.

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Marking points

  1. 1 Selects ‘The line would reach a higher peak.’

Why this answer loses marks

Removing the catalyst makes the reaction profile peak lower.

A catalyst lowers activation energy, so taking it away gives the reaction a larger energy barrier.

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