Describe7 marksChallenge
Catalysts are classified as either homogeneous or heterogeneous. With reference to a named example for each type, describe the mode of action of a heterogeneous catalyst and a homogeneous catalyst.
CAIE A Level Chemistry 9701 · Reaction kinetics
Reaction kinetics: describe question
How this question is marked
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
More Reaction kinetics questions
- 7 marks · A student investigates the decomposition of hydrogen peroxide, H2O2, which slowly decomposes to water and oxygen at room temperature…
- 7 marks · A gaseous reaction occurs between reactants A and B: A(g) + B(g) → products Describe, in terms of the frequency of effective collisions…
- 6 marks · A student adds a small amount of a soluble transition-metal salt to an aqueous reaction mixture. The rate of reaction increases, but the…
- 7 marks · A catalytic converter in a car exhaust speeds up the conversion of carbon monoxide and nitrogen monoxide into carbon dioxide and nitrogen…
- 7 marks · The activation energy, EA, for a reaction is pu50 kJ mol^-1. Describe, in terms of the Boltzmann distribution and the frequency of…
- 6 marks · A reaction has an activation energy of 80 kJ mol⁻¹. At 300 K, only a small fraction of molecules have energy greater than this value. At…
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.