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Lesson 3 Le Chatelier's Principle Gases. A (g) +B (g) ⇄ AB (g). 2 particles 1 particle. more pressure less pressure. When the reaction shifts to the right it lowers the pressure. When the reaction shifts to the left it increases the pressure. Simulation. - PowerPoint PPT Presentation
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Lesson 3Le Chatelier's Principle
Gases
A(g) + B(g) ⇄ AB(g)
2 particles 1 particle
more pressure less pressure
When the reaction shifts to the right it lowers the pressure
When the reaction shifts to the left it increases the pressure
50 Particles
Shifting right reduces the particles and the pressure
A(g) + B(g) ⇄ AB(g)Simulation
50 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting right reduces the particles and the pressure
49 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting right reduces the particles and the pressure
49 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting right reduces the particles and the pressure
48 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting right reduces the particles and the pressure
49 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting left increases the particles and the pressure
49 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting left increases the particles and the pressure
50 ParticlesA(g) + B(g) ⇄ AB(g)
Shifting right reduces the particles and the pressure
4HCl(g) + 2O2(g) ⇄ 2H2O(l) + 2Cl2(g)
Shifting left increases the pressure by making more particles.
less pressure
6 gas particles 2 gas particles
more pressure
2SO3(g) ⇄ 2SO2(g) + O2(g)
Shifting right it increases the pressure by making more particles.
more pressureless pressure
2 gas particles 3 gas particles
I2(g) + Cl2(g) ⇄ 2ICl(g)
2 gas particles 2 gas particles
the pressure is the same on both sides
This reaction will not shift with pressure.
6.1 Increasing the pressure by decreasing the volume shifts the to the fewest gas molecules. Only (g) count for gas particles.
4HCl (g) + 2O2 (g) ⇄ 2H2O (l) + 2Cl2 (g) + 98kJ
We decrease the volume
Simulation
6.1 Increasing the pressure by decreasing the volume shifts the to the fewest gas molecules. Only (g) count for gas particles.
4HCl (g) + 2O2 (g) ⇄ 2H2O (l) + 2Cl2 (g) + 98kJ
We decrease the volume
We decrease the volume and we increase pressure!
6.1 Increasing the pressure by decreasing the volume shifts to the fewest gas molecules. Only (g) count for gas particles.
4HCl (g) + 2O2 (g) ⇄ 2H2O (l) + 2Cl2 (g) + 98kJ
The reaction opposes by shifting to right to decrease the pressure!
6 mog 2 mog
All concentrations go up!
All rates go up!
We Do We Do Rx Does Shift
Volume Pressure Pressure Equation
right
left
left
right
right
0 ⇌ 1
4 ⇌ 7
9 ⇌ 3
8 ⇌ 5
3 ⇌ 5
increase
decrease
increase decrease
increase
decrease
increase
decrease increase
decrease
increase
decrease
increase
decrease
increase
We Do We Do Rx Does Shift
Volume Pressure Pressure Equation
right
left
left
right
right
6 ⇌ 9
40 ⇌ 53
10 ⇌ 8
7 ⇌ 2
6 ⇌ 7
increase
decrease
increase decrease
increase
decrease
increase
decrease increase
decrease
increase
decrease
increase
decrease
increase
5A(g) + 2B(g) 4C⇌ (g) + 5D(g)
7 mog 9 mog
We ⇓ V
5A(g) + 2B(g) 4C⇌ (g) + 5D(g)
7 mog 9 mog
We ⇓ V
5A(g) + 2B(g) 4C⇌ (g) + 5D(g)
7 mog 9 mog
We ⇓ V
5A(g) + 2B(g) 4C⇌ (g) + 5D(g)
7 mog 9 mog
We ⇓ V
5A(g) + 2B(g) 4C⇌ (g) + 5D(g)
We ⇑ P
The Reaction opposes ⇓ P
7 mog 9 mog
We ⇓ V
Shifts left
4A(g) + 2B(g) 3C⇌ (g) + 2D(g)
6 mog 5 mog
We ⇓ V
We ⇑ P
What volume change shifts right?
2A(g) + 2B(g) 3C⇌ (g) + 4D(g)
We ⇓ P
4 mog 7 mog
We ⇑ V
What volume change shifts right?
4HCl (g) + 2O2 (g) ⇄ 2H2O (l) + 2Cl2 (g) + 98kJ
6 mog 2 mog
Describe the shift in the above equilibrium system for each stress indicated. Describe how [HCl], [O2], and [Cl2] change.Stress Shift [HCl] [O2] [Cl2]
↓←↑ V
↑↑ ↑ ←↑ [Cl2] ――――Add water
↓↓↑←
↑↑ ↓→↑ [HCl]
↓ [O2]
↓ ↓
When the volume increases all concentration go down
The Forward and Reverse Rates and Shifting Explain in terms of the immediate changes to the forward and reverse rates after each stress why each shift occurs
2CO(g) + O2(g) ⇄ 2CO2(g) + energy
4. Volume is decreased
ShiftForwardReverse
The Forward and Reverse Rates and Shifting Explain in terms of the immediate changes to the forward and reverse rates after each stress why each shift occurs
2CO(g) + O2(g) ⇄ 2CO2(g) + energy
4. Volume is decreased
ShiftForwardReverse
Pressure increases!
All concentrations go up!
3 2
rightincreases by more increases
All rates go up!
