Equilibrium Expressions Worksheet
Grade 11 Chemistry worksheet focusing on writing and interpreting equilibrium expressions (Kc and Kp) for various chemical reactions.
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Equilibrium Expressions
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. Write the equilibrium expression (Kc) for the following reactions:
a) 2 NO(g) + O₂(g) ⇌ 2 NO₂(g)
b) N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g)
c) CaCO₃(s) ⇌ CaO(s) + CO₂(g)
2. Write the equilibrium expression (Kp) for the following reactions:
a) 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g)
b) PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
3. If the value of Kc for a reaction is very large (Kc >> 1), what does this indicate about the position of equilibrium?
The equilibrium lies to the left, favoring reactants.
The equilibrium lies to the right, favoring products.
The concentrations of reactants and products are equal.
The reaction is not at equilibrium.
4. Which of the following statements is true regarding the value of Kp compared to Kc for a reaction where the number of moles of gaseous products is greater than the number of moles of gaseous reactants (Δn > 0)?
Kp = Kc
Kp > Kc
Kp < Kc
Relationship depends on temperature.
5. The equilibrium constant expression for a heterogeneous equilibrium does not include the concentrations of pure solids or pure liquids because their concentrations are considered .
6. For a reaction where Kc = 0.001, the equilibrium favors the .
7. For the reaction H₂(g) + I₂(g) ⇌ 2 HI(g), at a certain temperature, the equilibrium concentrations are [H₂] = 0.10 M, [I₂] = 0.20 M, and [HI] = 0.40 M. Calculate the value of Kc for this reaction.
8. Consider the reaction N₂(g) + O₂(g) ⇌ 2 NO(g). At 2000 K, Kc = 4.1 x 10⁻⁴. If the equilibrium concentrations are [N₂] = 0.50 M and [O₂] = 0.50 M, calculate the equilibrium concentration of [NO].