If stress is applied to a system the system shifts to relieve the stress Le Châtelier’s...
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Transcript of If stress is applied to a system the system shifts to relieve the stress Le Châtelier’s...
Le Châtelier’s Principle
If stress is applied to a system the system shifts to relieve the stress
Le Châtelier’s Principle
Mountains and mole-hills:
If stress is added the reaction must shift in the opposite direction to “remove” the mountain
If stress is removed the hole must shift in the same direction to “fill in” the hole
Change in Concentration
Which direction will the reaction
shift if the concentration of CO is increased?
Change in Concentration
To even out the pile it must shift right
Which direction will the reaction
shift if the concentration of CO is decreased?
Change in Concentration
To even out the pile it must shift left
Which direction will the reaction
shift if the concentration of CH4is increased?
Change in Concentration
SHIFT LEFT
Which direction will the reaction
shift if the concentration of H2 is decreased?
Change in Concentration
SHIFT LEFT
Which direction will the reaction
shift if the concentration of H2O is decreased?
Change in Concentration
SHIFT RIGHT
Which direction will the reaction
shift if the concentration of H2 is increased?
Change in Concentration
SHIFT RIGHT
Remember that decreasing volume
is also increasing pressure If pressure is increased, the
reaction shifts to the side with the least amount of moles
Changes in Volume
What will happen if volume is
decreased?
Changes in Volume
Changes in VolumeThe reaction
shifts towards the right to
relieve stress
Which direction will the reaction
shift if the volume is decreased?
Changes in Volume
There would be no change because there are equal moles
on each side!!!
Temperature changes like
concentration…mountains and mole-hills
Changes in Temperature
Which direction will the reaction
shift if heat is added? What will happen if heat is
removed?
Changes in Temperature
Changes in Temperature
If heat is on the right side of the
reaction, it is exothermic If heat is on the left side of the
reaction, it is endothermic
Just a Note…
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