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Chemistry - Chemical Systems and Equilibrium > 7.4 Le Châtelier's Principle > Flashcards

7.4 Le Châtelier's Principle Flashcards

1
Q

What does Le Chatelier’s Principle state?

A

That if a dynamic equilibrium is disturbed by a change in conditions (stress), the position of the equilibrium shifts to counteract the change and reestablish equilibrium

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2
Q

When a reactant is added…

A
  • Shifts to the right
  • Increases concentration of products
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3
Q

When a reactant is removed…

A
  • Shifts to the left
  • Increases concentration of reactants
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4
Q

When a product is added…

A
  • Shifts to the left
  • Increases concentration of reactants
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5
Q

When a product is removed…

A
  • Shifts to the right
  • Increases concentration of products
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6
Q

In Le Chatelier’s Principle we treat energy as…

A
  • A reactant in an endothermic system
  • A product in an exothermic system
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7
Q

When an endothermic system is cooled…

A
  • Shifts to the left
  • Favours reactants
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8
Q

When an endothermic system is heated…

A
  • Shifts to the right
  • Favours products
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9
Q

When an exothermic system is cooled…

A
  • Shifts to the right
  • Favours products
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10
Q

When an exothermic system is heated…

A
  • Shifts to the left
  • Favours reactants
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11
Q

How does the system reduce pressure?

A

By shifting to the side with fewer moles of gas molecules

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12
Q

How do you know if pressure has no effect on the equilibrium?

A

If there are the same number of molecules on both sides of the equilibrium reaction

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13
Q

1st way to change the pressure of a reaction system

A

Add or remove a gaseous reactant or product

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14
Q

2nd way to change the pressure of a reaction system

A

Add an inert gas

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15
Q

What’s an inert gas?

A

A gas not involved in reaction

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16
Q

3rd way to change the pressure of a reaction system

A

Change the volume of the container

17
Q

3 Changes that do not affect equilibrium position

A
  1. A Catalyst
  2. Adding an inert gas
  3. States of reactants
18
Q

Catalyst

A
  • Allows reaction to reach equilibrium faster
  • Does not change equilibrium position and final equilibrium concentrations
19
Q

Adding an inert gas

A
  • Total pressure of the system increases
  • Does not effect the equilibrium constant
  • A non-reactive gas does not change the pressure of the other gases
20
Q

States of Reactants

A
  • Equilibrium position is only affected by entities that are part of the equilibrium law
  • Ex: adding more of a solid will not disrupt the system

Chemistry - Chemical Systems and Equilibrium (12 decks)

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