CHM 2046C Module 10 Sample Exam Answers

Part H: LaChatelier’s Principle Questions

Based on the followinq Equations, use the choices to describe the equibrium shifts, if any, when the following conditions are changed:

a. shifts left b. shifts right c. No effect

4 HCl (g) + O₂ (g) ç è 2 H₂O (g) + 2 Cl₂ (g)

_A-Left__1. 1 mole of Chlorine gas is injected after equilibrium is reached

_B-Right_2. Water is removed after equilibrium is reached

_A-Left_ 3. Additional Heat is applied to system after equilibrium is

reached, (the reaction is exothermic)

_C-No Effect_4. Nitrogen gas is injected into the vessle after equilibrium is
reached

_B-Right_5. Additional Oxygen gas is injected after equilibrium is reached

_A-left_6. Increasing the size of the vessle from 1 to 3 liters after

equilibrium is reached

PCl₅ çè PCl₃ + Cl₂

_A-Left__7. Chlorine gas is injected into the vessle

_B-Right_8. Additional Heat is added to the system after equilibrium is

Achieved (the reaction is endothermic)

_C-No Effect _9. Nitrogen gas is injected into the vessle

_A-Left_10. The gases are compressed into a vessle ½ half the original

Size after equilibrium is achieved.