Chemistry · Chemical Equilibrium

Chemistry — Chemical Equilibrium

Work with dynamic equilibrium, reaction quotients, equilibrium constants, and the effects of changing reaction conditions.

20 cardsHigh school / introductory universityIntermediate

A focused review

Topics covered

chemical equilibriumreaction quotientequilibrium constantLe Châtelierchemistry

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Question 01What does it mean for a reversible reaction in a closed system to reach dynamic equilibrium?

Answer

The forward and reverse reactions continue at equal rates, so the macroscopic amounts of reactants and products remain constant.

Question 02At equilibrium, must reactant and product concentrations be equal?

Answer

No. Their concentrations are constant at equilibrium, but they need not equal one another.

Question 03For aA + bB ⇌ cC + dD, what is the concentration form of the equilibrium constant Kc?

Answer

Kc = [C]^c[D]^d / ([A]^a[B]^b), using equilibrium concentrations and the balanced equation’s coefficients as exponents.

Question 04Which substances are omitted from a standard Kc expression?

Answer

Pure solids and pure liquids are omitted; their activities are treated as constant.

Question 05What does a large K value indicate about an equilibrium mixture?

Answer

At that temperature, products are favored at equilibrium relative to reactants; K does not describe how quickly equilibrium is reached.

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