CourseCourseConceptConceptDocsDocuments

Edexcel A-Level Chemistry A2 13.5 The Value of the Equilibrium Constant Is Not Affected By Changes in Concentration or Pressure or By the Addition of Questions

For both directly tagged tasks, state no change in the equilibrium constant and justify it through equal catalytic acceleration of the two opposing rates.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • State that a catalyst has no effect on Kc or Kp because both reaction directions speed up equally.

Edexcel A-Level Chemistry A2 13.5 The Value of the Equilibrium Constant Is Not Affected By Changes in Concentration or Pressure or By the Addition of Questions question 1

[Maximum number: 1]

This question is about sulfuric acid and its salts.

The manufacture of sulfuric acid involves the equilibrium

2SO2( g)+O2( g)⇌2SO3( g)ΔrH=−197 kJ mol−12 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g}) \quad \Delta_{\mathrm{r}} H=-197 \mathrm{~kJ} \mathrm{~mol}^{-1}

A catalyst of vanadium(V) oxide is used in this reaction.

State the effect, if any, of the catalyst on the value of the equilibrium constant, KpK_{p}.

All question bank results loaded