Which of these statements is true about chemical equilibria in general? (1) At e

Question

Which of these statements is true about chemical equilibria in general? (1) At equilibrium, the rate of the forward reaction is equal to as the rate of the reverse reaction (2) Equilibrium is the result of the cessation of all chemical (3) There is only one set equilibrium concentrations that equals the Kc value (4) At equilibrium, the rate constant of the forward reaction is equal to the rate constant for the reverse reaction. The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO_2 (aq) + H_2O (l) rightwardsharpoonoverleftwardsharpoon H_2CO_3(aq) which one of the following is the correct equilibrium constant expression (Kc) for this reaction? (1) Kc = [H_2CO_3]/[CO_2][H_2O] (2) Kc = [CO_2]/[H_2CO_3] (3) Kc = [CO_2][H_2O]/[H_2CO_3] (4) Kc = [H_2CO_3]/[CO_2] A reaction with an equilibrium constant Kc = 1.5 times 10^-25 would consist of which of the following at equilibrium? (1) approximately equal reactants and products (2) some reactants and products with reacts slightly favored (3) some reactants and products with products slightly favored (4) essentially all reactants

Explanation / Answer

(20)

(A)

Equilibirum is the state of reversible reaction where rate of forward and backward reactions are equal.

(21)

(4) Kc = [H2CO3]/[CO2]

Euilibrium constant is the ratio of product of concentrations of products to the product of concentrations of reactants.

If there are Pure liquids (OR) solids their concentrations are taken as unity. so, [H2O] = 1

(22)

(4) Essentially all reactants.

Because Kc is too samll indicating the denominator value is too high i.e. concentrations of reactants.

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