Chemical equilibrium

Question 1

Equilibrium constant equation

Answer 1

K = [C]ᶜ[D]ᵈ / [A]ᵃ[B]ᵇ

aka Law of Mass Action

Question 2

Law of Mass Action

Answer 2

For a reversible reaction at equilibrium and a constant temperature, a certain ratio of reactant and product concentrations has a constant value

Question 3

K&raquo_space; 1

Answer 3

Products favored at equilibrium

Question 4

K &laquo_space;1

Answer 4

Reactants favored at equilibrium

Question 5

Equilibrium constant (gaseous reactions)

Answer 5

Kₚ = Kc (0.0821T)^Δn

Kₚ = PᵇB / PᵃA

Question 6

Kc for multiple equilibria

Answer 6

Kc = Kc’Kc’’

Kc' = [C][D] / [A][B]
Kc'' = [E][F] / [C][D]

Question 7

Reverse rate of A + 2B AB₂

Answer 7

rateᵣ = kᵣ[AB₂]

Question 8

Forward rate of A + 2B AB₂

Answer 8

ratef = kf[A][B]²

Question 9

Reaction quotient Qc

Answer 9

Ratio of product concentrations to reactant concentrations, each raised to the power of their stoichiometric coefficients at some point other than equilibrium

Question 10

Determine equilibrium direction

Answer 10

Qc = Kc — reaction at equilibrium
Qc > Kc — reaction moves right to left to reach eq
Qc < Kc — reaction moves left to right to reach eq

Question 11

Which experimental variables affect value of EQ constant?

Answer 11

Only temperature

Concentration, pressure, and volume may affect equilibrium position but not Kc value