Le Chatelier's Principle

1. Predict the shift in the following equilibrium when Fe3+ is added:

FeSCN2+(aq) ς Fe3+(aq) + SCN-(aq)

 A. Shifts right 

 B. Shifts left 

 C. No change 

2. Predict the change in the following equilibrium when the pressure is doubled:

2O3(g) ς 3O2(g)

 A. Shifts left 

 B. Shifts right 

 C. No change 

3. Predict the change in the following equilibrium when the pressure is doubled:

N2(g) + O2(g) ς 2NO(g)

 A. Shifts left 

 B. Shifts right 

 C. No change 

4. Predict the shift in the following equilibrium when the temperature is decreased:

N2(g) + 3H2(g) ς 2NH3(g) ΔH° = -46.3 kJ/mol

 A. Shifts right 

 B. Shifts left 

 C. No change 

5. Consider the reaction:

2SO2(g) + O2(g) ς 2SO3(g) ΔH° = -198.2 kJ/mol. 

What combination of pressure and temperature will maximize the yield of SO3?

 A. High pressure, high temperature 

 B. Low pressure, high temperature 

 C. Low pressure, low temperature 

 D. High pressure, low temperature