AP®︎ Chemistry: Topic 7.4 Flashcards

Master key terms and definitions for Topic 7.4 of AP Chemistry – Calculating the Equilibrium Constant to help you prep for quizzes and the AP exam.

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Term

Equilibrium Constant Calculation

Definition

Substitute equilibrium concentrations or partial pressures into the correct expression and solve for K.

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Equilibrium Constant Calculation
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Substitute equilibrium concentrations or partial pressures into the correct expression and solve for K.

7.4.A7.4.A.1
Kc and Kp
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Kc uses equilibrium molar concentrations; Kp uses equilibrium partial pressures of gases.

7.4.A7.4.A.1
Included and Excluded Phases in K
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Include gases and aqueous species; omit pure solids and pure liquids from the expression.

7.4.A
Moles to Molarity for Kc
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Divide moles by solution volume in liters to get equilibrium molarity for substitution into Kc.

7.4.A7.4.A.1
Mole Fraction and Partial Pressure
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Find a gas partial pressure with PA = XA times Ptotal before using it in Kp.

7.4.A7.4.A.1
Reaction Quotient vs Equilibrium Constant
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Q uses current values; K uses only equilibrium values and equals Q only at equilibrium.

7.4.A
Interpreting K Magnitude
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K greater than 1 is product-favored, K less than 1 is reactant-favored, and K is never negative.

7.4.A
Unitless Nature of K
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The equilibrium constant is treated as having no units in AP Chemistry.

7.4.A
Equilibrium Constant Expression
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Products over reactants, with each concentration or pressure raised to its coefficient.

7.4.A