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Edexcel IAL Chemistry 9.8 Catalysts and Maxwell–Boltzmann distributions

Keep the distribution curve fixed at constant temperature, place catalysed Eₐ to the left and compare the larger area whose particles can react.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Label distribution axes and place catalysed Eₐ left of the uncatalysed threshold.
  • Interpret the larger area beyond catalysed Eₐ as more particles able to react.
  • Explain the faster rate through more successful collisions per unit time, not a shifted curve.

9.8—Interpret the action of a catalyst in terms of a qualitative understanding of the Maxwell-Boltzmann distribution question 1

[Maximum number: 3]

Some diesel cars contain an extra catalytic converter for the reduction of nitrogen oxides (NOx)\left(\mathrm{NO}_{\mathrm{x}}\right) in exhaust gases.
A solution of urea is used for this process.

Figure for Question 9.8—Interpret the action of a catalyst in terms of a qualitative understanding of the Maxwell-Boltzmann distribution question 1 — Edexcel A-Level Chemistry AS

urea

The catalytic converter contains metal oxides. When the exhaust gases pass through the catalytic converter, ammonia reacts with NO×\mathrm{NO}_{\times}gases to form nitrogen and water.

Explain how a catalyst increases the rate of a chemical reaction.

Use the Maxwell-Boltzmann distribution shown and refer to the collision theory.

Number of particles with energy, E

Figure for Question 9.8—Interpret the action of a catalyst in terms of a qualitative understanding of the Maxwell-Boltzmann distribution question 1 — Edexcel A-Level Chemistry AS
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