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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