# Le Châtelier’s Principle

## Presentation on theme: "Le Châtelier’s Principle"— Presentation transcript:

Le Châtelier’s Principle

Le Châtelier’s Principle
If stress is applied to a system the system shifts to relieve the stress

Change in Concentration
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? To even out the pile it must shift right

Change in Concentration
Which direction will the reaction shift if the concentration of CO is decreased? To even out the pile it must shift left

Change in Concentration
Which direction will the reaction shift if the concentration of CH4is increased? SHIFT LEFT

Change in Concentration
Which direction will the reaction shift if the concentration of H2 is decreased? SHIFT LEFT

Change in Concentration
Which direction will the reaction shift if the concentration of H2O is decreased? SHIFT RIGHT

Change in Concentration
Which direction will the reaction shift if the concentration of H2 is increased? SHIFT RIGHT

Changes in Volume 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?

The reaction shifts towards the right to relieve stress
Changes in Volume The reaction shifts towards the right to relieve stress

There would be no change because there are equal moles on each side!!!
Changes in Volume Which direction will the reaction shift if the volume is decreased? There would be no change because there are equal moles on each side!!!

Changes in Temperature
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

Just a Note… 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

Review

Review

Review