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Edexcel A-Level Chemistry AS 9.1 Understand in Terms of the Collision Theory the Effect of Changes in Concentration Temperature Pressure and Surface Area Questions

Practise Edexcel IAL Chemistry 9.1 by linking particles per volume and collision frequency to rate, and separating faster initial rates from final product amounts.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain concentration or pressure effects through particles per volume and collision frequency.
  • Separate a faster initial rate from unchanged final product when reacting amounts are fixed.

Edexcel A-Level Chemistry AS 9.1 Understand in Terms of the Collision Theory the Effect of Changes in Concentration Temperature Pressure and Surface Area Questions question 1

[Maximum number: 1]

Ammonium nitrate, NH4NO3\mathrm{NH}_{4} \mathrm{NO}_{3}, is used in the manufacture of fertilisers and explosives. It is produced on a large scale using only methane, water and air.
The process has four stages.

In Stage 3, nitrogen monoxide, NO, is produced in the reaction between NH3\mathrm{NH}_{3} (from Stage 2) and O2\mathrm{O}_{2} (from the air). The conditions used are a temperature of 1100 K in the presence of a platinum-rhodium catalyst.

4NH3( g)+5O2( g)⇌4NO( g)+6H2O( g)ΔH=−905 kJ mol−14 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 4 \mathrm{NO}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) \quad \Delta H=-905 \mathrm{~kJ} \mathrm{~mol}^{-1}

Give one reason why a high temperature is needed in this reaction.

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