# Equilibria

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• Created by: r98
• Created on: 19-03-16 21:13
What does Le Chatelier's principle state?
When a system at equilibrium is disturbed, the equilibrium position moves in the direction that will reduce the disturbance.
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What has the same effect as changing the pressure?
Changing the concentrations of all the gases involved, because it squeezes more gas molecules into the same volume.
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In which direction does the equilibrium move if Kc increases?
Equilibrium moves to the right, i.e. the forward direction (more product).
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In which direction does the equilibrium move if Kc decreases?
The equilibrium moves to the left, i.e the backwards direction (less product).
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What's the expression for Kc?
Kc = [products]/[reactants]
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What happens to the value of Kc if the temperature of an exothermic reaction is increased?
The equilibrium constant decreases.
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What happens to the value of Kc if the temperature of an endothermic reaction is increased?
The equilibrium constant increases.
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In which direction does the equilibrium move if the temperature of an exothermic reaction is increased?
Moves to the left.
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In which direction does the equilibrium move if the temperature of an endothermic reaction is increased?
Moves to the right.
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What does it mean if Kc is much greater that 1?
Products predominate over reactants. Equilibrium is over to the right.
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What does it mean if Kc is much less that 1?
Reactants predominate over products. Equilibrium position is over to the left.
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How do catalysts affect Kc and the position of equilibrium? Why?
No effect on the value of Kc and therefore the position of equilibrium. They affect the rates of both the forward and back reactions equally. They do however affect the rate at which equilibrium is reached.
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## Other cards in this set

### Card 2

#### Front

What has the same effect as changing the pressure?

#### Back

Changing the concentrations of all the gases involved, because it squeezes more gas molecules into the same volume.

### Card 3

#### Front

In which direction does the equilibrium move if Kc increases?

### Card 4

#### Front

In which direction does the equilibrium move if Kc decreases?

### Card 5

#### Front

What's the expression for Kc?

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