Le Chatalier’s Principle - Chandler Unified School District
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Transcript Le Chatalier’s Principle - Chandler Unified School District
LE CHATELIER’S PRINCIPLE
Definition
Changes in
concentration
Way to predict changes that
occur when an equilibrium
system is disturbed
N 2(g) +3H 2(g) 2NH 3(g)
Rate of forward reaction
increases until equilibrium is
reestablished.
Increase in N 2 or H 2
K eq remains the same
Equilibrium position shifts right
LE CHATELIER’S PRINCIPLE
Changes in
Concentration
(continued)
Increase in NH 3
N 2 +3H 2 2NH 3
Rate of reverse reaction
increases until equilibrium is
reestablished
K eq stays the same
Equilibrium position shifts to
the left
Decrease in reactants Equilibrium position shifts to
the left
Decrease in products
Equilibrium position shifts to
the right
LE CHATELIER’S PRINICIPLE
Changes in Concentration
2H 2(g) + O 2(g) 2H 2 O (l)
Increase in reactants
Equilibrium position shifts
right
Increase in products
No shift in equilibrium
position
H 2 O (l) not a dispersed phase
LE CHATELIER’S PRINCIPLE
Changes in Volume
N 2 +3H 2 2NH 3
Decrease volume
of system
Pressure increases
Equilibrium position will shift to
side with fewest dispersed
molecules
Above reaction shifts right
K eq stays the same
Increase in
volume
Equilibrium position shifts to
side with most dispersed
molecules
Above shifts left
LE CHATELIER’S PRINCIPLE
Changes in Temp
Decrease
temperature of
system
Increase in
temperature
N 2 +3H 2 2NH 3 + Energy
Energy Decreases
Equilibrium position will shift to
side with less stored chemical
energy
Above reaction shifts right
K eq changes!!
Equilibrium position shifts to
side with most stored chemical
energy
Above shifts left