Equilibrium Expressions Worksheet

This worksheet focuses on understanding and writing equilibrium expressions (Kc and Kp) for various chemical reactions at Grade 9 level.

Grade 9 Science ChemistryChemical EquilibriumEquilibrium Expressions

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3 Short AnswerFill in the BlanksMultiple ChoiceTrue / False

Standards

HS-PS1-2HS-PS1-3

Topics

chemistryequilibriumequilibrium expressionsgrade 9

8 sections · Free to use · Printable

Equilibrium Expressions

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Read each question carefully and provide your answers in the spaces provided. Show all your work for calculations.

1. Write the equilibrium expression (Kc) for the following reversible reaction:

2NO(g) + O2(g) ⇌ 2NO2(g)

2. Write the equilibrium expression (Kc) for the decomposition of phosphorus pentachloride:

PCl5(g) ⇌ PCl3(g) + Cl2(g)

3. In an equilibrium expression, the concentrations of are placed in the numerator, and the concentrations of are placed in the denominator.

4. Pure solids and pure liquids are from equilibrium expressions because their concentrations are considered .

5. Which of the following is the correct equilibrium expression (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)?

Kc = [N2][H2]³ / [NH3]²

Kc = [NH3]² / [N2][H2]³

Kc = [NH3] / [N2][H2]

Kc = [N2][H2] / [NH3]

6. Write the equilibrium expression (Kc) for the following reaction:

CaCO3(s) ⇌ CaO(s) + CO2(g)

7. The equilibrium constant (Kc) for a reaction changes if the temperature changes.

True

False

8. The value of Kp is always equal to the value of Kc for any given reaction.

True

False

9. Write the equilibrium expression (Kp) for the following reaction:

2SO2(g) + O2(g) ⇌ 2SO3(g)