A-LevelChemistryReaction kineticsMay/June 2022Paper 1 Q151 Mark
A large amount of N₂O(g) decomposes into nitrogen gas and oxygen gas in the presence of a tiny amount of a gold foil catalyst. The gold foil provides a solid surface on which the catalysed reaction takes place. The graph shows the concentration of N₂O(g) against time as it decomposes. The graph is a straight line. [Figure showing graph of concentration of N₂O(g) vs time/min] Which row describes: • the change in rate of reaction as N₂O(g) decomposes from 0 to 10 minutes • the effect of adding more gold foil catalyst on the rate of decomposition of the same amount and concentration of N₂O(g)?
Anone, increases
Bnone, none
Cdecreases, increases
Ddecreases, none
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of reaction kinetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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