Le Chatelier's Principle Quiz

Example Questions From the Test

• 1For 2NO₂(g) ⇌ N₂O₄(g), the container is expanded at constant temperature. In which direction does the equilibrium shift?
  • Toward N₂O₄, because expansion favors larger molecules
  • Toward N₂O₄, because its concentration falls more slowly
  • Toward NO₂, the side with more moles of gas
  • There is no shift because expansion affects both gases equally
• 2For a reaction at a fixed temperature, the reaction quotient Q is less than the equilibrium constant K. What must occur as equilibrium is approached?
  • The value of K decreases until it equals Q.
  • The reaction proceeds in reverse overall, forming more reactants.
  • The reaction proceeds forward overall, forming more products.
  • No net change occurs because Q and K describe unrelated quantities.
• 3Which change can alter the value of the equilibrium constant, K, for a particular reaction?
  • Adding more reactant
  • Changing the container volume
  • Adding a catalyst
  • Changing the temperature