Worksheet: Le Chatelier's Principle
In this worksheet, we will practice using Le Chatelier's principle to predict directions of change for equilibria in response to a stimulus.
Consider the exothermic reaction shown, which reaches equilibrium at 500 K and 10 bar. Which of the following actions would lead to a decrease in the amount of methanol in the equilibrium reaction mixture?
- AThe addition of hydrogen gas to the mixture at constant pressure
- BThe rise in temperature from 500 K to 600 K
- CThe decrease in volume of the mixture
- DThe increase in pressure from 10 bar to 12 bar
- EThe pumping of an inert (unreactive) gas into the reaction mixture under constant volume conditions
Consider the following reaction. Suppose you wanted to shift the equilibrium position of the reaction in the direction that favors more dimer formation. Which of the following changes in reaction conditions would help achieve that goal?
- AA decrease in the total pressure of the reaction mixture, with temperature held constant
- BAn increase in the total pressure of the reaction mixture, with temperature held constant
- CA simultaneous increase in temperature and increase in pressure
- DAn increase in the temperature of the reaction mixture, with total pressure held constant
A suspension consists of solid silver(I) sulfate and an equilibrium solution of silver(I) and sulfate ions, as shown. If more silver(I) sulfate were added to the solution, which of the following effects would be observed?
- AThe concentration would decrease and the concentration would increase.
- BAdditional silver(I) sulfate would form and precipitate from solution as ions and ions combined.
- CThe added silver(I) sulfate would dissolve.
- D and concentrations would not change.
- EThe concentration would increase and the concentration would decrease.