ES - equilibria *01 Flashcards

1
Q

characteristics of a dynamic equilibrium

A

the forward reaction will be going at the same rate as the backward reaction.
the amounts of reactants and products won’t be changing
in a closed system

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2
Q

what is a reversible reaction?

A

the reaction goes both ways

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3
Q

what does the position of equilibrium tell you?

A

how much reactant and how much product you’ll have at equilibrium

if equilibrium lies to the left - more reactants than products

if equilibrium lies to the right - more products than reactants

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4
Q

what is Kc?

A

an equilibrium constant

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5
Q

how can you work out Kc?

A

need concentrations

general reaction
aA + bB cC + dD

Kc = [C]^c x [D]^d / [A]^a x [B]^b

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6
Q

what does Kc tell us?

A

the position of the equilibrium

the larger the Kc value, the further to the right the equilibrium lies

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7
Q

what does it mean if: Kc&raquo_space; 1

A

equilibrium lies far to the right

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8
Q

what does it mean if: Kc > 1

A

the equilibrium lies to the right

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9
Q

what does it mean if: Kc &laquo_space;1

A

equilibrium lies far to the left

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10
Q

what does it mean if: Kc < 1

A

equilibrium lies to the left

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11
Q

does changing concentration change Kc

A

no

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12
Q

does changing temperature change Kc

A

Yes

increasing temp. means adding heat so equilibrium will shift in the endothermic direction to absorb the heat

decreasing temp. removes heat so equilibrium shifts in the exothermic direction to try and replace heat

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13
Q

does changing pressure change Kc

A

no

equli. position changes
increasing pressure shifts equilibrium to the side with fewer gas molecules, this reduces the pressure

decreasing the pressure shift equilibrium to side with more gas molecules, this raises the pressure

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14
Q

opposing change

A

a reversible reaction will always oppose change

if increase temp. reaction will work to decrease it ect.

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