Homogeneous and heterogeneous catalysts past paper questions

Chemistry 9701 · Reaction kinetics. 1 explain that catalysts can be homogeneous or heterogeneous 2 describe the mode of action of a heterogeneous catalyst to include adsorption of reactants, bond weakening and desorption of products, for example: (a) iron in the Haber process (b) palladium, platinum and rhodium in the catalytic removal of oxides of nitrogen from the exhaust gases of car engines 3 describe the mode of action of a homogeneous catalyst by being used in one step and reformed in a later step, for example: (a) atmospheric oxides of nitrogen in the oxidation of atmospheric sulfur dioxide (b) Fe2+ or Fe3+ in the I–/S2O8 2– reaction Inorganic chemistry

In Cambridge A Level Chemistry 9701, Homogeneous and heterogeneous catalysts came up in 19 of the 139 papers on Paperstreak, for about 2 marks a paper when it does. It last came up in October/November 2025.

Often set with Nitrogen oxides and pollution, Addition polymerisation, Hess’s law, Oxidising alcohols.

19 questions, newest first

9701/13/O/N/25 Question 14 · 1 mark
9701/23/M/J/24 Question 2 part (d(i)) · 3 marks
9701/11/O/N/22 Question 24 · 1 mark
9701/13/O/N/22 Question 24 · 1 mark
9701/12/F/M/22 Question 11 · 1 mark
9701/12/O/N/21 Question 11 · 1 mark
9701/21/O/N/21 Question 4 part (a(iv)) · 1 mark
9701/21/M/J/20 Question 3 parts (e(i)) (e(ii)) · 5 marks
9701/22/O/N/19 Question 4 part (d(ii)) · 1 mark
9701/12/M/J/19 Question 11 · 1 mark
9701/23/M/J/19 Question 4 part (b(iv)) · 2 marks
9701/11/O/N/18 Question 11 · 1 mark
9701/13/O/N/18 Question 11 · 1 mark
9701/21/O/N/18 Question 3 part (a(iii)) · 3 marks
9701/23/O/N/18 Question 3 part (a(iii)) · 3 marks
9701/11/M/J/18 Question 11 · 1 mark
9701/12/M/J/18 Question 19 · 1 mark
9701/22/M/J/18 Question 3 part (d(iii)) · 2 marks
9701/12/M/J/17 Question 34 · 1 mark

Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.