# 10.4 Dynamic Equilibrium

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• Created by: cd0
• Created on: 07-01-18 17:53
What are reversible reactions?
Reactions that take place in both forward and reverse directions.
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What does dynamic equilibrium mean?
The forward and reverse reactions are taking place at equilibrium.
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Do concentrations of reactants and products change at equilibrium.
No.
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At equilibrium, what is the relationship between the rates of the forward and reverse reactions?
The rates are equal.
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What type of system is required for a reaction to remain in equilibrium?
A closed system.
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What does the position of equilibrium indicate?
The extent of the reaction.
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If concentration of R & P changes in a reversible reaction, what may change also?
Position of equilibrium.
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If pressure changes in a reversible reaction, what may also change?
Position of equilibrium.
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What does le Chatelier's principle state?
That when a system in equilibrium is subjected to external changes, the system readjusts itself to minimise the effect of the change.
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What is the effect of increasing concentration of reactants on an equilibrium system?
Equilibrium shifts to the right, as more products are formed.
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What is the effect of increasing concentration of products on an equilibrium system?
Equilibrium shifts to the left, as more reactants are formed.
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What is the effect of decreasing concentration of reactants on an equilibrium system?
Equilibrium shifts to the left, to increase the number of reactants formed.
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What is the effect of decreasing concentration of products on an equilibrium system?
Equilibrium shifts to the right, to increase the number of products formed.
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How does increasing temperature alter the position of equilibrium?
It shifts in the endothermic direction, (positive deltaH)
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How does decreasing temperature alter the position of equilibrium?
It shifts in the exothermic direction, (negative deltaH)
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How does increasing pressure alter the position of equilibrium?
It shifts to the side with least moles, in an attempt to minimise the change in pressure.
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How does decreasing pressure alter the position of equilibrium?
It shifts to the side with most moles in an attempt to minimise the change of pressure.
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How does the addition of a catalyst alter the position of equilibrium?
It doesn’t alter the position.
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## Other cards in this set

### Card 2

#### Front

What does dynamic equilibrium mean?

#### Back

The forward and reverse reactions are taking place at equilibrium.

### Card 3

#### Front

Do concentrations of reactants and products change at equilibrium.

### Card 4

#### Front

At equilibrium, what is the relationship between the rates of the forward and reverse reactions?

### Card 5

#### Front

What type of system is required for a reaction to remain in equilibrium?