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Edexcel A-Level Chemistry AS 9.5 The Role of Catalysts in Providing Alternative Reaction Routes of Lower Activation Energy Questions

Practise Edexcel IAL Chemistry 9.5 by identifying catalytic effects, explaining lower activation energy and separating catalyst changes from equilibrium or enthalpy.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • State that a catalyst supplies an alternative pathway with lower activation energy.
  • Use reaction-time evidence to identify which added substance acts as a catalyst.
  • Explain that a catalyst changes Eₐ but not ΔH, equilibrium position or equilibrium constant.

Edexcel A-Level Chemistry AS 9.5 The Role of Catalysts in Providing Alternative Reaction Routes of Lower Activation Energy Questions question 1

[Maximum number: 1]

The Sabatier process uses carbon dioxide and hydrogen to produce methane and water.

CO2( g)+4H2( g)⇌CH4( g)+2H2O( g)ΔrH=−165 kJ mol−1\mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) \quad \Delta_{\mathrm{r}} H=-165 \mathrm{~kJ} \mathrm{~mol}^{-1}

The process is carried out at a temperature of 400∘C400^{\circ} \mathrm{C} and a pressure of 30 atm , in the presence of a nickel catalyst.

State how a catalyst increases the rate of a reaction.

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