Edexcel A-Level Chemistry AS 9.8 Interpret the Action of a Catalyst in Terms of a Qualitative Understanding of the Maxwell Boltzmann Distribution Questions

Practise Edexcel IAL Chemistry 9.8 by labelling Maxwell–Boltzmann distributions, locating catalysed activation energy and explaining successful collisions.

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.

[Maximum number: 3]

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

Figure for Question Edexcel A-Level Chemistry AS 9.8 Interpret the Action of a Catalyst in Terms of a Qualitative Understanding of the Maxwell Boltzmann Distribution Questions 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 $\mathrm{NO}_{\times}$ 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

All question bank results loaded

Edexcel A-Level Chemistry AS 9.8 Interpret the Action of a Catalyst in Terms of a Qualitative Understanding of the Maxwell Boltzmann Distribution Questions question 1