Le Chatelier Principle Flashcards

1
Q

Le Chatelier’s Principle

A

If a system at equilibrium is disturbed, then it will shift in whichever direction it has to, to restore equilibrium

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2
Q

For the DAT, I need to know how systems at equilibrium are affected by?

A

1) adding or removing reactants or products
2) changing temperature
3) changing volume or pressure
4) adding a catalyst

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3
Q

the rate of forward and reverse reactions are the same for systems at equilibrium. This does NOT mean that ____ is the same?

A

amounts of reactants and products

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4
Q

How can balance be restored after adding or removing a reactant or product?

A

by the reaction shifting in whichever direction it needs to in order to return to its original equilibrium state

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5
Q

If a reaction is exothermic, it _____ heat?

A

gives off heat, -

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6
Q

If a reaction is endothermic, it _____ heat?

A

consumes heat, +

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7
Q

How can balance be restored after changing temperature for a exothermic rxn?

A

exothermic-gives off heat.
This means heat is a product.
Add heat = shift left
Remove heat= shift right

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8
Q

How can balance be restored after changing temperature for a endothermic rxn?

A

endothermic- consumes heat. This means heat is a reactant
Add heat= shift right
Remove heat= shift left

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9
Q

How a system restores equilibrium after a temperature change depends on whether the reaction is?

A

endothermic or exothermic

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10
Q

How does a system restore equilibrium is pressure is added?

A

By shifting in whatever direction REDUCES the number of gas molecules (think of it like trying to make a crowded room, less crowded by removing ppl aka molecules)

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11
Q

How does a system restore equilibrium if volume is decreased?

A

By shifting in whatever direction REDUCES the number of gas molecules. Aka the reaction shifts to whichever side has fewer gas molecules

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12
Q

Volume and pressure are directly or indirectly related?

A

indirectly. as volume decreases, pressure increases

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13
Q

How does a system restore equilibrium if volume is increased or if pressure is decreased?

A

By shifting in whatever direction INCREASES the number of gas molecules. Aka the reaction shifts to whichever side has more gas molecules

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14
Q

Does adding an inert gas have any affect on equilibrium?

A

No. Inert gas isn’t part of the reaction (the gas doesn’t react). so NO SHIFT

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15
Q

How does adding a catalyst affect equilibrium?

A

It does NOT affect or shift equilibrium. It simply makes the reaction GET to equilibrium ore quickly.

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