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Learning objective

Construct Kp expressions for gaseous homogeneous equilibria.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Equilibrium constant Kp for homogeneous systems (A-level only)

Subtopic

Kp and partial pressure (A-level only)

Aqa A Level ChemistryPhysical chemistry

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Quick explanation

Construct Kp expressions for gaseous homogeneous equilibria

  • This point belongs to Equilibrium constant Kp for homogeneous systems (A-level only), especially Kp and partial pressure (A-level only).
  • You need to be able to construct Kp expressions for gaseous homogeneous equilibria.
  • The key ideas to know are Kp.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Kp

Why it matters

This objective helps connect Kp and partial pressure (A-level only) to exam-style questions, flashcards, and revision notes for Equilibrium constant Kp for homogeneous systems (A-level only).

Quick student answer

For the equilibrium reaction 2 NO(g) + O2(g) ⇌ 2 NO2(g), which of the following expressions correctly represents Kp?

Direct answer

Kp = (P_NO2)^2 / (P_NO)^2 (P_O2)

Key terms

  • Partial Pressure: The pressure exerted by a single component of a mixture of gases, measured in atmospheres (atm).
  • Equilibrium Constant (Kp): A numerical value that expresses the ratio of the products' partial pressures to the reactants' partial pressures at equilibrium.

Common trap

Incorrectly writing Kp expressions: Always refer to the balanced equation and ensure that each term in the Kp expression corresponds to the correct power based on the coefficients.

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