1930879
OCR A2 Chemistry
Le Chatelier's
Principle
- Dynamic Equilibrium
- The equilibrium which exists in a
closed system when the rate of the
forward reaction is equal to the rate of
the reverse reaction
- A chemical system is in dynamic equilibrium when:
- The concentrations of the
reactants and the products
remain the same
- The rate of the forward
reaction is equal to that of the
reverse reaction
- The concentrations of the
reactants and the products
remain the same
- The equilibrium which exists in a
closed system when the rate of the
forward reaction is equal to the rate of
the reverse reaction
- The effect of pressure on equilibrium
- Changing the pressure only changes the
position of equilibrium if there are gases
present
- Increasing the pressure will
shift the position of
equilibrium to the side with
the fewer gas molecules
- Decreasing the pressure will shift
the position of the equilibrium to the
side with a greater number of gas
molecules
- Changing the pressure only changes the
position of equilibrium if there are gases
present
- The effect of temperature on equilibrium
- Increasing the temperature shifts the
position of the equilibrium in the
endothermic direction in order to minimise
the temperature increase and absorb energy
- Decreasing the temperature shifts the
position of the equilibrium in the
exothermic direction in order to
minimise the temperature decrease and
replace heat energy
- Increasing the temperature shifts the
position of the equilibrium in the
endothermic direction in order to minimise
the temperature increase and absorb energy
- Le Chatelier's principle states:
- When a system in dynamic equilibrium is
subjected to change the position of the
equilibrium will shift to minimise the
change
- When a system in dynamic equilibrium is
subjected to change the position of the
equilibrium will shift to minimise the
change
- The effect of concentration on equilibrium
- The effect of a catalyst on equilibrium
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