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Gibbs Free Energy
relating delta H, delta S, and delta G
5
Chemistry
Undergraduate 1
02/06/2013

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Cards

Term

If ΔH is negtive

ΔS is postive

 

The rxn will be?

Definition

spontaneous at all temperatures

 

ΔG=ΔH-TΔS

(-3) - (298k)(5)

neg answer

heat is released, is already disordered

Term

If ΔH is (+)

ΔS is (-)

 

The rxn will be?

Definition

NONspontaneous at all temperatures

 

ΔG=ΔH-TΔS

(+3)-(298)(-3)

3- (-894)

=+ 897

a very POSITVE Gibbs = bad

Term

If ΔH is (+)

ΔS is (+)

 

The rxn will be?

Definition

If ΔH is (+): energy absorbed (endothermic)

If ΔS is (+): energy is absorbed 

(b/c Q/T is postive)

Term

If ΔH is (-)

ΔS is (-)

 

The rxn will be?

Definition

spontaneous at LOW temps

If ΔH is (-): exothermic (doesnt need extra heat)

ifΔS is (-): energy being released

Term
if a reaction is spontaneous is it fast?
Definition
Not neccessarily, a slow rxn can still be spotaneous (without any energy output)
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