LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.
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Transcript of LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.
![Page 1: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/1.jpg)
LE CHATELIER’S PRINCIPLE
Chapter 13Section 13.5
![Page 2: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/2.jpg)
Le Chatelier’s Principle
If a system at equilibrium is subjected to a stress, a reaction proceeds in that direction that tends to relieve the disturbing force.
Let’s look at three important stresses!
![Page 3: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/3.jpg)
Change in Concentration
Example: H2 (g) + I2 (g) ↔ 2HI (g)
What happens if the concentration of I2 increases?
The reaction will shift to the right.(More I2 will have to be converted to HI and
the [H2] will decrease)
![Page 4: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/4.jpg)
Change in Pressure
Only affects gases!Example: CO (g) + 2H2 (g) ↔ CH3OH (g)
What happens if we increase the pressure on the system?
The reaction will shift in the direction that produces the fewest number of moles of gas.
The reaction will shift right! (3 moles vs. 1 mole)
![Page 5: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/5.jpg)
Changes in Temperature
Example: 2SO2 (g) + O2 (g) ↔ 2SO3 (g) + 180 Kj/mol
What if we increase the temperature (add heat) to the system?
The reaction will shift to the left! Away from the heat
![Page 6: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/6.jpg)
Addition of a Catalyst
A catalyst is a substance that is added to a reaction to increase its rate. It does not effect the equilibrium. It just helps the reaction to reach equilibrium faster.
![Page 7: LE CHATELIER’S PRINCIPLE Chapter 13 Section 13.5.](https://reader035.fdocuments.net/reader035/viewer/2022071709/56649d6f5503460f94a51961/html5/thumbnails/7.jpg)
Homework
Complete the “Le Chatelier’s Principle” Worksheet