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Entropy/Free Energy

Chem 2

TermDefinition
Chemical Thermodynamics provides info about equilibrium and whether a reaction is spontaneous
Exothermic (∆H) ∆H<0
Endothermic (∆H) ∆H>0
In order to be spontaneous the energy... of the product must be less than the reactant
entropy randomness vs orderliness of a system
A spontaneous process results in.... an increase in the entropy of the universe (DeltaS>0)
A perfect crystal has... 0 entropy and 0 K
Enthalpy is measured in... Kilojoules
Entropy is measured in... joules
entropy depends on... Phase, complexity, weight, and temp
an increase in temp results in... an increase in entropy
entropy of pure elements 0
an entropic process is spontaneous if... Delta S > 0
(∆S (sur) = -Delta H (sy)/ T
∆S(un)= Delta S (sy) + (-Delta H/T)
Spontaneous at all temperatures Exothermic and positive entropy
Spontaneous at lower temperatures Exothermic and negative entropy
Spontaneous at high temperatures Endothermic and positive entropy
Never spontaneous Endothermic and Negative entropy
Gibbs Free energy equation Delta S(un)= DeltaH- T x Delta S
Forward and Spontaneous reaction Delta G is large and negative
Forward and non-spontaneous Delta G is large and positive
product favored -Delta H, +delta S, -delta G
Reactant favored +Delta H, -delta S, +delta G
Temp dependent -,- or +,+
Positive DeltaS Spontaneous
Negative DeltaS not spontaneous
Created by: Lyd543
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