Equilibrium Expressions Worksheet
A Grade 12 Chemistry worksheet focusing on understanding and writing equilibrium expressions (Kc and Kp) for various chemical reactions.
Includes
Standards
Topics
Equilibrium Expressions
Name:
Date:
Score:
Read each question carefully and provide the best answer. Remember to show your work for calculations and clearly state equilibrium expressions.
Chemical equilibrium is a state where the rate of the forward reaction equals the rate of the reverse reaction, and the concentrations of reactants and products remain constant. The equilibrium expression, K, describes the ratio of product concentrations to reactant concentrations at equilibrium, each raised to the power of their stoichiometric coefficients.
1. Which of the following statements is TRUE regarding a system at chemical equilibrium?
The concentrations of reactants and products are equal.
The forward reaction has stopped.
The rates of the forward and reverse reactions are equal.
The equilibrium constant is always 1.
2. In an equilibrium expression, pure solids and pure liquids are from the expression.
3. The equilibrium constant, Kc, is expressed in terms of , while Kp is expressed in terms of .
4. Write the equilibrium expression (Kc) for the following reaction:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
5. Write the equilibrium expression (Kc) for the following heterogeneous reaction:
CaCO₃(s) ⇌ CaO(s) + CO₂(g)
6. Write the equilibrium expression (Kp) for the following reaction:
2SO₂(g) + O₂(g) ⇌ 2SO₃(g)
7. A large value of Kc indicates that the products are favored at equilibrium.
True
False
8. The value of the equilibrium constant changes with temperature.
True
False
9. For the reaction A(g) + B(g) ⇌ C(g), at equilibrium, the concentrations are [A] = 0.50 M, [B] = 0.75 M, and [C] = 1.50 M. Calculate the equilibrium constant Kc.