Equilibrium Constant and Reaction Quotient

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What is the expression for the rate of the forward reaction in a reversible reaction?

r1 = k1 [C]c [D]d
r1 = k1 [A]a [B]b (correct)
r1 = k2 [A]a [B]b
r1 = k2 [C]c [D]d

What is the condition for a system to be in equilibrium?

The concentrations of the reactants are equal to the concentrations of the products
The rate of the forward reaction is less than the rate of the reverse reaction
The rate of the forward reaction is equal to the rate of the reverse reaction (correct)
The rate of the forward reaction is greater than the rate of the reverse reaction

What is the equilibrium constant expression for a reaction?

𝐊𝐜 = [𝐂]𝐜 [𝐃]𝐝/[𝐀]𝐚 [𝐁]𝐛 (correct)
𝐊𝐜 = [𝐂]𝐜 [𝐃]𝐝-[𝐀]𝐚 [𝐁]𝐛
𝐊𝐜 = [𝐂]𝐜 [𝐃]𝐝+[𝐀]𝐚 [𝐁]𝐛
𝐊𝐜 = [𝐀]𝐚 [𝐁]𝐛/[𝐂]𝐜 [𝐃]𝐝

What do the exponents a, b, c, and d represent in the equilibrium constant expression?

The coefficients of the balanced equation (C) Signup and view all the answers

What is the significance of a larger K value in a reaction?

The concentrations of the products of the forward reaction are greater than those of the reactants. (B) Signup and view all the answers

What is the equilibrium constant expression for the reaction N2 (g) + 3 H2 (g) 2 NH3 (g)?

Kp = (pNH3)^2/(pN2)(pH2)^3 (B) Signup and view all the answers

What is the unit of the equilibrium constant Kc?

Unitless (B) Signup and view all the answers

In a heterogeneous equilibrium, what happens to the concentration of a pure solid or liquid?

It is constant under constant conditions. (A) Signup and view all the answers

What is the significance of a smaller K value in a reaction?

The concentrations of the products of the forward reaction are less than those of the reactants. (D) Signup and view all the answers

What is the physical interpretation of the equilibrium constant Kc?

It is the ratio of the concentrations of products to reactants (A) Signup and view all the answers

What is the relationship between the rates of forward and reverse reactions at equilibrium?

The rate of the forward reaction is equal to the rate of the reverse reaction (D) Signup and view all the answers

What is the mathematical expression for the rate of the reverse reaction?

r2 = k2 [C]c [D]d (A) Signup and view all the answers

What is the condition for which the equilibrium constant Kc is a constant?

k1 and k2 are both constants (C) Signup and view all the answers

What is the significance of the equilibrium constant expression?

It describes the ratio of the concentrations of products to reactants (B) Signup and view all the answers

A reaction has an equilibrium constant expression of Kc = [HI]2/[H2][I2]. Which of the following statements is true?

The reaction involves only gases (A) Signup and view all the answers

For the reaction CaCO3 (s) → CaO (s) + CO2 (g), what is the reason why the concentrations of solid CaCO3 and CaO do not appear in the equilibrium constant expression?

Because their concentrations are constant under constant conditions (C) Signup and view all the answers

For a reaction with an equilibrium constant Kp, which of the following statements is true?

Kp is equivalent to Kc for reactions involving only gases (B) Signup and view all the answers

In the reaction 2 SO2 + O2 → 2 SO3, if Kc is greater than 1, what can be inferred about the reaction?

The equilibrium position lies more to the right (B) Signup and view all the answers

For the reaction H2 (g) + CO2 (g) → H2O (g) + CO (g), if Kc is 0.771 at 750°C, what can be inferred about the reaction?

The reaction favors the reactants (A) Signup and view all the answers