Term
| Le Chatelier's Principal def |
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Definition
when a chemicalsystem is at equilibrium is disturbed:
the system will shift in a direction that minimizes the distrurbance, |
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Term
given
N2O4 (g) ↔ 2 NO2 (g)
if more NO2 is added what direction will the rxn go?
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Definition
more product =
rxn will shift to the left
(aka it will convert the 'extra' product to reactants) |
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Term
given
N2O4 (g) ↔ 2 NO2 (g)
if more N2O4 is added what direction will the rxn go?
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Definition
the rxn will shift to the right
(it will use the extra reactant to make more product) |
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Term
CaCO3 (s)↔ CaO (s) + CO2 (g)
What is the effect of adding CaCO3? |
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Definition
nothing , Le Chatelier's Principle only applies to gases
solids, liquids, inert gases (do not affect the direction of the conc of the rxn) |
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Term
| In general if the pressure is increased then the volume is |
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Definition
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Term
The effect of volume / pressure changes on Equilibrium:
N2 (g) + 3 H2 (g)↔ 2NH3
If the pressure is HIGH what direction will the rxn go? |
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Definition
N2 (g) + 3 H2 (g)↔ 2NH3
4 moles↔ 2 moles
This rxn will go from high to low
FORWARD
(high pressure causes it to flow from an area of high vol to an area of low volume) |
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Term
The effect of volume / pressure changes on Equilibrium:
N2 (g) + 3 H2 (g)↔ 2NH3
If the pressure is LOW what direction will the rxn go? |
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Definition
rxn will flow from low to high concentration
(aka low pressure= high vol) |
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Term
the effect of temperature change:
in an exothermic rxn
what if the temp is increased?
k will be? |
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Definition
rxn will shift
(reversible rxn)
k is decreased
*adding heat to a rxn that is already supposed to release heat causes it go back to reactants. |
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Term
the effect of temperature change:
in an exothermic rxn
what if the temp is decreased?
k will be? |
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Definition
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Term
the effect of temperature change:
in an endothermic rxn
what if the temp is decreased?
k will be? |
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Definition
reverse rxn
k decreases
* remember endothermic rxns NEED heat |
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