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Edexcel A-Level Chemistry A2 13.6 The Effect of Changing the Temperature on the Equilibrium Constant Kc and Kp for Both Exothermic and Endothermic Reactions Questions

Treat temperature as the only listed condition that changes K: favouring the endothermic direction increases its relative equilibrium terms and changes the constant accordingly.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Predict whether K rises or falls after heating from the endothermic reaction direction.
  • Infer whether the forward reaction is exothermic or endothermic from the temperature trend in K.
  • Use the K expression to connect changed equilibrium partial pressures with the new value.

Edexcel A-Level Chemistry A2 13.6 The Effect of Changing the Temperature on the Equilibrium Constant Kc and Kp for Both Exothermic and Endothermic Reactions Questions question 1

[Maximum number: 1]

The equation for the reaction between iron and steam is shown.

3Fe( s)+4H2O( g)⇌Fe3O4( s)+4H2( g)ΔH=−151.2 kJ mol−13 \mathrm{Fe}(\mathrm{~s})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) \rightleftharpoons \mathrm{Fe}_{3} \mathrm{O}_{4}(\mathrm{~s})+4 \mathrm{H}_{2}(\mathrm{~g}) \quad \Delta H=-151.2 \mathrm{~kJ} \mathrm{~mol}^{-1}

What is the effect on the equilibrium constant for this reaction if small pieces of iron are replaced by iron powder and if the temperature is increased?
□ A
□ B
□ C
□ D

Table for Question Edexcel A-Level Chemistry A2 13.6 The Effect of Changing the Temperature on the Equilibrium Constant Kc and Kp for Both Exothermic and Endothermic Reactions Questions question 1 — Edexcel A-Level Chemistry A2
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