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Edexcel A-Level Chemistry A2 11.11 The Use of a Solid Heterogeneous Catalyst for Industrial Reactions in the Gas Phase in Terms of Providing a Surface Questions

Practise Edexcel IAL Chemistry 11.11 by explaining adsorption and surface reaction on solid catalysts, product desorption and porous-support active sites.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Explain rate stopping when reaction mixture is separated from the solid catalyst.
  • Describe adsorption, bond weakening, surface reaction and product desorption.
  • Link porous catalyst support to greater surface area and more available active sites.

Edexcel A-Level Chemistry A2 11.11 The Use of a Solid Heterogeneous Catalyst for Industrial Reactions in the Gas Phase in Terms of Providing a Surface Questions question 1

[Maximum number: 3]

A student investigated the kinetics of the reaction between bromate(V) ions and bromide ions in acidic conditions.

BrO3−(aq)+5Br−(aq)+6H+(aq)→3Br2(aq)+3H2O(l)\mathrm{BrO}_{3}^{-}(\mathrm{aq})+5 \mathrm{Br}^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_{2}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

The presence of bromate(V) ions in drinking water is harmful to humans. Bromate(V) ions can be converted to less harmful bromide ions by passing the water through palladium with a reducing agent.

Describe how a heterogeneous catalyst, such as palladium, increases the rate of a reaction.
(3)

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