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.

Q1:

How does an increase in temperature affect the equilibrium constant for an exothermic reaction?

  • AIt has no effect on its value.
  • BIt decreases its value.
  • CIt increases its value.
  • DThere is not enough information provided to answer this question.

Q2:

Consider the exothermic reaction shown, which reaches equilibrium at 500 K and 10 bar. CO()+2H()CHOH()ggg23 Which of the following actions would lead to a decrease in the amount of methanol in the equilibrium reaction mixture?

  • AThe addition of hydrogen (H)2 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

Q3:

Consider the following reaction. 2NO()NO()224gg 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

Q4:

In which direction will a decrease in container volume shift the equilibrium shown? 2NH()N()+3H()322ggg

  • ATo the left
  • BNeither; a change in container volume will not change the position of the equilibrium
  • CThe information provided is not enough to answer the question.
  • DTo the right

Q5:

In which direction will a decrease in container volume shift the equilibrium shown? N()+O()2NO()22ggg

  • ATo the left
  • BThe information provided is not enough to answer the question.
  • CNeither; a change in container volume will not change the position of the equilibrium
  • DTo the right

Q6:

In which direction will a decrease in container volume shift the equilibrium shown? 2O()3O()32gg

  • ANeither; a change in container volume will not change the position of the equilibrium
  • BTo the right
  • CTo the left
  • DThe information provided is not enough to answer the question.

Q7:

In which direction will a decrease in container volume shift the equilibrium shown? CaO()+CO()CaCO()sgs23

  • ANeither; a change in container volume will not change the position of the equilibrium
  • BTo the right
  • CTo the left
  • DThe information provided is not enough to answer the question.

Q8:

A suspension consists of solid silver(I) sulfate and an equilibrium solution of silver(I) and sulfate ions, as shown. 2Ag()+SO()AgSO()+4224aqaqs If more silver(I) sulfate were added to the solution, which of the following effects would be observed?

  • AThe Ag+ concentration would decrease and the SO42 concentration would increase.
  • BAdditional silver(I) sulfate would form and precipitate from solution as Ag+ ions and SO42 ions combined.
  • CThe added silver(I) sulfate would dissolve.
  • D A g + and SO42 concentrations would not change.
  • EThe Ag+ concentration would increase and the SO42 concentration would decrease.

Q9:

Ammonia is a weak base that reacts with water according to the equation shown. NH()+HO()NH()+OH()324+aqlaqaq Which one of the following, if added to the solution, would increase the proportion of ammonia that is converted to the ammonium ion?

  • A H C l
  • B N H O H 4
  • C N a C l
  • D N H C l 4
  • E N a O H

Q10:

In which direction will an increase in temperature shift the position of equilibrium in the reaction shown? 2O()3O(),kJmol32ggΔ𝐻=285/

  • AThe information provided is not enough to answer the question.
  • BNeither; a change in temperature will not change the position of the equilibrium
  • CTo the right
  • DTo the left

Q11:

In which direction will an increase in temperature shift the position of equilibrium in the reaction shown? CaO()+CO()CaCO(),kJmolsgs23Δ𝐻=176/

  • ANeither; a change in temperature will not change the position of the equilibrium
  • BTo the left
  • CThe information provided is not enough to answer the question.
  • DTo the right

Q12:

In which direction will an increase in temperature shift the position of equilibrium in the reaction shown? N()+O()2NO(),kJmol22gggΔ𝐻=181/

  • ANeither; a change in temperature will not change the position of the equilibrium
  • BTo the left
  • CTo the right
  • DThe information provided is not enough to answer the question.

Q13:

In which direction will an increase in temperature shift the position of equilibrium in the reaction shown? 2NH()N()+3H(),kJmol322gggΔ𝐻=92/

  • ANeither; a change in temperature will not change the position of the equilibrium
  • BTo the left
  • CTo the right
  • DThe information provided is not enough to answer the question.

Q14:

Which of the following would decrease the proportion of hydrazine, NH24, in an equilibrium described by the equation shown? N()+2H()NH()kJmol2224ggg,Δ𝐻=95/

  • ADecrease the volume of the container
  • BAdd N2
  • CDecrease the pressure
  • DAdd H2
  • EHeat the mixture

Q15:

Which of the following will cause [NO]2 to decrease in an aqueous solution of KNO2?

  • AAdding HNO2
  • BAdding NaCl
  • CAdding HCl
  • DAdding KNO2
  • EAdding NaOH

Q16:

Which of the following will cause [HNO]2 to decrease in an aqueous solution of KNO2?

  • AAdding HNO2
  • BAdding HCl
  • CAdding NaCl
  • DAdding KNO2
  • EAdding NaOH

Q17:

Which of the following will increase the percent of NH3 that is converted to the ammonium ion in water?

  • AAddition of HO2
  • BAddition of NaOH
  • CAddition of NHCl4
  • DAddition of HCl

Q18:

Nitrogen and hydrogen react to form ammonia gas with No Change in temperature or volume, as shown. N()+3H()2NH()223ggg If hydrogen is added to the system, which of the following is false?

  • AThe position of equilibrium will move to the right.
  • B P ( N H ) 3 will increase.
  • C P ( H ) 2 will increase.
  • D 𝐾 P will increase.
  • E P ( N ) 2 will decrease.

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