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Equilibrium constant Kp for homogeneous systems (A-level only)
This A-level-only topic applies equilibrium constants to gaseous systems.
5
Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaA LevelChemistryPhysical chemistry
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Start revising Equilibrium constant Kp for homogeneous systems (A-level only)
Syllabus checklist
What you need to know
5 objective pages available
Kp and partial pressure (A-level only)5 objectives
- Define partial pressure in a gas mixture.
- Calculate mole fractions and partial pressures.
- Construct Kp expressions for gaseous homogeneous equilibria.
- Calculate Kp and determine appropriate units.
- Interpret Kp values in terms of equilibrium position.
Key terms
Partial PressureMole FractionEquilibrium Constant (Kp)
Exam tips
- Always show your workings in calculations: When calculating partial pressures, clearly show the formula used, the values substituted, and the final answer with units.
- Show all steps in calculations: When calculating partial pressures or mole fractions, clearly show each step of your calculation.
Common mistakes
- Confusing partial pressure with total pressure: Remember that partial pressure refers to the pressure of one specific gas in a mixture, while total pressure is the sum of all partial pressures.
- Incorrectly calculating mole fractions: Always ensure to calculate the total number of moles in the mixture before finding the mole fraction.
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