Chapter 6: Equilibrium, Le Chatelier and Kc

A-level ChemistryModule 3: Periodic Table & Energy8 topicsHigher

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Module 3: Periodic Table and Energy: Equilibrium, Le Chatelier and Kc - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

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6 marksdescribestandardOCR A

For Equilibrium, Le Chatelier and Kc, describe how equilibrium composition, Kc and Le Chatelier reasoning applies to ammonia synthesis in the Haber process.

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6 markscalculatehardOCR A

Using ammonia synthesis in the Haber process, calculate a relevant OCR A Equilibrium, Le Chatelier and Kc quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Equilibrium, Le Chatelier and Kc: Temperature (K) vs Equilibrium yield of ammonia (%)

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Ammonia yield falls as temperature rises because the forward reaction is exothermic. The industrial Haber process uses a compromise temperature for sufficient rate and acceptable yield.

The graph for Equilibrium, Le Chatelier and Kc shows data from ammonia synthesis in the Haber process. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In ammonia synthesis in the Haber process, evaluate the experimental method or model assumptions used when applying equilibrium composition, Kc and Le Chatelier reasoning.

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5. Rates, Collision Theory and Boltzmann Distributions

End of Module 3: Periodic Table & Energy

Key learning objectives

Understand the key principles behind Equilibrium, Le Chatelier and Kc.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.