Draw an arrow showing which way the reaction must shift to reestablish equilibrium. 2 SO₂ (g) + O₂(g) → 2 SO, (g) Remove 0₂ or SO2: Add 02 or SO₂: 2 SO₂ (g) + O₂(g) → 2 SO, (g) Add S03: Remove SO3: 2 SO₂ (g) + O₂(g) → 2 SO, (g) 2 SO₂ (g) + O₂(g) → 2 SO, (g)

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Chapter1: Chemical Foundations
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Equilibrium
Some chemical reactions occur both in the forward direction & the reverse direction.
2 SO₂ (g) + O₂(g) →2 SO, (g)
2 SO, (g) 2 SO₂ (g) + O₂(g)
Forward:
Reverse:
2 SO₂ (g) + O₂(g) →2 SO, (g)
Written as a single reaction:
Eventually the rate of the reverse reaction equals the rate of the forward reaction, chemical equilibrium has
been reached.
0₂
SO₂ SO₂
SO2 O₂ SO₂
You can think of a chemical reaction in equilibrium like a balance - substances are moving
from the left pan to the right pan at the same rate as from the right pan to the left so, the bal-
ance stays even.
SO2 O2 SO2
SO3 SO3
Changes in Equilibrium = Le Chatlier's Principle
Le Chatlier's Principle-when stress is put on a system in equilibrium, the equilibrium is shifted
to relieve the stress. Possible stresses: addition of reactant, removal of reactant, addition of
product, removal of product (Note: heat can be a reactant or a product).
In the case of the balance, if we add (or remove) substances from one of the pans,
the balance (equilibrium) is disrupted.
Remove 0₂ or SO2:
In order to get the balance back, there has to be a shift of substance from the heavy pan to the light pan.
Draw an arrow showing which way the reaction must shift to reestablish equilibrium.
2 SO₂ (g) + O₂(g) → 2 SO, (g)
Add SO3:
Add 02 or S02: 2 SO₂ (g) + O₂ (g) 2 SO, (g)
Remove SO3:
SO3 SO3
SO3 SO3
2 SO₂ (g) + O₂(g) → 2 SO, (g)
2 SO₂ (g) + O₂(g) → 2 SO, (g)
5
Transcribed Image Text:Equilibrium Some chemical reactions occur both in the forward direction & the reverse direction. 2 SO₂ (g) + O₂(g) →2 SO, (g) 2 SO, (g) 2 SO₂ (g) + O₂(g) Forward: Reverse: 2 SO₂ (g) + O₂(g) →2 SO, (g) Written as a single reaction: Eventually the rate of the reverse reaction equals the rate of the forward reaction, chemical equilibrium has been reached. 0₂ SO₂ SO₂ SO2 O₂ SO₂ You can think of a chemical reaction in equilibrium like a balance - substances are moving from the left pan to the right pan at the same rate as from the right pan to the left so, the bal- ance stays even. SO2 O2 SO2 SO3 SO3 Changes in Equilibrium = Le Chatlier's Principle Le Chatlier's Principle-when stress is put on a system in equilibrium, the equilibrium is shifted to relieve the stress. Possible stresses: addition of reactant, removal of reactant, addition of product, removal of product (Note: heat can be a reactant or a product). In the case of the balance, if we add (or remove) substances from one of the pans, the balance (equilibrium) is disrupted. Remove 0₂ or SO2: In order to get the balance back, there has to be a shift of substance from the heavy pan to the light pan. Draw an arrow showing which way the reaction must shift to reestablish equilibrium. 2 SO₂ (g) + O₂(g) → 2 SO, (g) Add SO3: Add 02 or S02: 2 SO₂ (g) + O₂ (g) 2 SO, (g) Remove SO3: SO3 SO3 SO3 SO3 2 SO₂ (g) + O₂(g) → 2 SO, (g) 2 SO₂ (g) + O₂(g) → 2 SO, (g) 5
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