Learning objective
Calculate Kp and determine appropriate units.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Flashcards
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Questions
Topic
Equilibrium constant Kp for homogeneous systems (A-level only)
Subtopic
Kp and partial pressure (A-level only)
Study support
Understand this objective
Quick explanation
Calculate Kp and determine appropriate units
- 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 calculate Kp and determine appropriate units.
- The key ideas to know are Kp and units.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
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 reaction 2NO(g) + O2(g) ⇌ 2NO2(g), what is the expression for the equilibrium constant 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.
- Equilibrium Constant (Kp): A numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a gas-phase reaction.
Common trap
Incorrect Kp Expression: Always ensure that the Kp expression reflects the stoichiometry of the balanced equation.
Related questions
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Flashcard prompts
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Revision tools
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Practice Questions0 linked questions
Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Define partial pressure in a gas mixture.
Kp and partial pressure (A-level only)
- Calculate mole fractions and partial pressures.
Kp and partial pressure (A-level only)
- Construct Kp expressions for gaseous homogeneous equilibria.
Kp and partial pressure (A-level only)
- Interpret Kp values in terms of equilibrium position.
Kp and partial pressure (A-level only)