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Lesson: Le Chatelier's Principle

Worksheet • 18 Questions

Q1:

Solutes A and B react to produce solutes C and D in a reversible reaction, as shown by the equation. In a solution at equilibrium, the concentrations of A , B , C , and D are [ A ] , [ B ] , [ C ] , and [ D ] respectively. When a small quantity of compound C is added to this solution, the composition of the solution changes according to Le Chatelier’s principle.

According to Le Chatelier’s principle, how and why does the position of equilibrium change?

  • A The position of equilibrium moves to the left to lower [ C ] .
  • B The position of equilibrium is unchanged as the reaction has no effect on the number of solute molecules.
  • C The position of equilibrium moves to the right to lower [ C ] .
  • D The position of equilibrium moves to the right to raise [ C ] .
  • E The position of equilibrium moves to the left to raise [ C ] .

Which equilibrium concentrations increase when compound C is added?

  • A [ A ] , [ B ] , and [ C ] only
  • B [ C ] only
  • C [ A ] , [ B ] , [ C ] , and [ D ]
  • D [ A ] and [ B ] only
  • E [ C ] and [ D ] only

Which of the following ratios of equilibrium concentrations does not change when compound C is added?

  • A [ A ] [ B ]
  • B [ A ] [ C ]
  • C [ B ] [ D ]
  • D [ C ] [ D ]

Q2:

In which of the following reactions would the addition of hydrochloric acid decrease the quantity of solid material?

  • A B i C l ( ) + H O ( ) B i O C l ( ) + 2 H C l ( ) 3 2 a q l s a q
  • B [ C u ( H O ) ] ( ) + 4 C l ( ) [ C u C l ] ( ) + 6 H O ( ) 2 6 2 + 4 2 2 a q a q a q a q
  • C N H C l ( ) N H ( ) + H C l ( ) 4 3 s a q a q
  • D [ C r ( H O ) ( O H ) ] ( ) + 3 O H ( ) [ C r ( O H ) ] ( ) + 3 H O ( ) 2 3 3 6 3 2 s a q a q l
  • E A g N O ( ) + C l ( ) A g C l ( ) + N O ( ) 3 3 a q a q s a q

Q3:

In which of the following gas-phase reactions would the equilibrium yield increase with increasing pressure?

  • A 2 N O + C H O H C H O N O + H N O 2 3 3 3
  • B S C l + C l 2 S C l 2 2 2 2
  • C C H + H O C O + 3 H 4 2 2
  • D O F + S O S O + F 2 2 3 2
  • E P C l P C l + C l 5 3 2
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