Equilibrium Worksheet



Name__________________________________________ Date____________________ Chemistry

Equilibrium Quiz

Complete the following questions on a separate piece of paper.

1. Write the equilibrium expression, Keq, for each of the following reactions:

a) 2 NO(g) + O2(g) ⇌2 NO2(g)

b) 4 HCl(g) + O2(g) ⇌2 H2O(g) + 2 Cl2(g)

c) NOCl(g)⇌NO(g) + ½ Cl2(g)

d) Fe3+(aq) + SCN-(aq)⇌FeSCN2+(aq)

e) CaCl2(s) ⇌Ca2+(aq) + 2Cl-(aq)

2. Classify the following equilibria as heterogeneous or homogeneous, and write an equilibrium expression for each.

a) NH4NO2(s) ⇌N2(g) + 2 H2O(g)

b) H2O(l) ⇌ H2O(g)

c) SO2(g) + ½ O2(g) ⇌ SO3(g)

d) S8(s) + 8 O2(g) ⇌ 8 SO2(g)

3. At the equilibrium point in the decomposition of phosphorus pentachloride to chlorine and phosphorus trichloride, the following concentrations are obtained: 0.010 mol/L PCl5, 0.15 mol/L PCl3 and 0.37 mol/L Cl2. Determine the Keq for the reaction.

PCl5(g) ⇌ PCl3(g) + Cl2(g)

KEY Equilibrium Quiz

Complete the following questions on a separate piece of paper.

4. Write the equilibrium expression, Keq, for each of the following reactions:

a) 2 NO(g) + O2(g) ⇌2 NO2(g)

[pic]

b) 4 HCl(g) + O2(g) ⇌2 H2O(g) + 2 Cl2(g)

[pic]

c) NOCl(g)⇌NO(g) + ½ Cl2(g)

[pic]

d) Fe3+(aq) + SCN-(aq)⇌FeSCN2+(aq)

[pic]

e) CaCl2(s) ⇌Ca2+(aq) + 2Cl-(aq)

[pic]

5. Classify the following equilibria as heterogeneous or homogeneous, and write an equilibrium expression for each.

a) NH4NO2(s) ⇌N2(g) + 2 H2O(g) heterogeneous

[pic]

b) H2O(l) ⇌ H2O(g) heterogeneous

[pic]

c) SO2(g) + ½ O2(g) ⇌ SO3(g) homogeneous

[pic]

d) S8(s) + 8 O2(g) ⇌ 8 SO2(g) heterogeneous

[pic]

6. At the equilibrium point in the decomposition of phosphorus pentachloride to chlorine and phosphorus trichloride, the following concentrations are obtained: 0.010 mol/L PCl5, 0.15 mol/L PCl3 and 0.37 mol/L Cl2. Determine the Keq for the reaction.

PCl5(g) ⇌ PCl3(g) + Cl2(g)

C = 0.001 M 0.15 M 0.37 M

[pic]

Therefore, the Keq value for the reaction is 5.55.

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