Learning objective

Calculate equilibrium concentrations from Kc where appropriate.

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At a glance

Flashcards

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Topic

Chemical equilibria, Le Chatelier's principle and Kc

Subtopic

Equilibrium constant Kc

AQA A Level ChemistryPhysical chemistry

Study support

Understand this objective

Short explanation

Calculate equilibrium concentrations from Kc where appropriate. sits within Equilibrium constant Kc for Chemical equilibria, Le Chatelier's principle and Kc in AQA A-Level Chemistry 7405. A strong exam response should identify the relevant chemical relationship, choose the correct formula or representation where needed, substitute values or evidence carefully, and state the final conclusion with appropriate units or terminology. When revising this objective, focus on the distinction between the concept being tested and neighbouring ideas so that calculation steps, organic representations, or equilibrium reasoning do not collapse into a generic answer.

Key concepts

equilibrium concentrationKc expression

Why it matters

This objective helps connect Equilibrium constant Kc to exam-style questions, flashcards, and revision notes for Chemical equilibria, Le Chatelier's principle and Kc.

Common mistakes

1 linked

Incorrect Calculation of Equilibrium Concentrations: To fix this, remember to write the Kc expression based on the balanced equation. For example, for the reaction aA + bB ⇌ cC + dD, the Kc expression is Kc = [C]^c [D]^d / [A]^a [B]^b. Substitute the equilibrium concentrations into the expression and solve for the unknown concentration.

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