# Equlibria

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Define 'Dymamic Equilibrium'
the rate of the forwards reaction = the rate of the backwards reaction, concentrations of reactants and products are constant, both reactions are continuing
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Define 'Le Chatalier's Principle'
when a reaction at equilibrium is subjected to a change in concentration, temperature or pressure, a reaction occurs to oppose the change
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What is homogenous equilibrium?
when all reactants and products are in the same physical state
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What is heterogenous equilibrium?
when all reactants and products are in different physical states
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What is Kc?
the equilibrium constant
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Write an expression for Kc for the equation aA+bBcC+dD
Kc=(([C]^c)([D]^d))/(([A]^a)([B]^b))
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If you add a reactant or remove a product, what is the effect on the position of equilibrium and Kc?
Eqm: shifts right. Kc: no effect.
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If you remove a reactant or add a product, what is the effect on the position of equilibrium and Kc?
Eqm: shifts left. Kc: no effect.
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What happens to the position of equilibrium and Kc when you increase the pressure?
Eqm: moves to the side with fewer gas moles. Kc: no effect.
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What happens to the position of equilibrium and Kc when you decrease the pressure?
Eqm: moves to the side with more gas moles. Kc: no effect.
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What happens to the position of equilibrium and Kc when you increase the temperature?
Eqm: moves in endothermic direction. Kc: increases if deltaH = +ve, decreases if deltaH = -ve
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What happens to the position of equilibrium and Kc when you decrease the temperature?
Eqm: moves in exothermic direction. Kc: decreases if deltaH = +ve, increases if deltaH = -ve
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What happens to the position of equilibrium and Kc when you add or remove a catalyst?
Eqm: no effect. Kc: no effect.
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## Other cards in this set

### Card 2

#### Front

Define 'Le Chatalier's Principle'

#### Back

when a reaction at equilibrium is subjected to a change in concentration, temperature or pressure, a reaction occurs to oppose the change

### Card 3

#### Front

What is homogenous equilibrium?

### Card 4

#### Front

What is heterogenous equilibrium?

What is Kc?