Chapter 16. Spontaneity, entropy and free energy. Spontaneous. A reaction that will occur without outside intervention. We can’t determine how fast. We need both thermodynamics and kinetics to describe a reaction completely. Thermodynamics compares initial and final states.
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Spontaneity, entropy and free energy
DS
DH
DG=DHTDS+

At all Temperatures
At high temperatures,
“entropy driven”
+
+
At low temperatures,
“enthalpy driven”


Not at any temperature,
Reverse is spontaneous

+
DS
DH
DG=DHTDS+

At all Temperatures
At high temperatures,
“entropy driven”
+
+
At low temperatures,
“enthalpy driven”


Not at any temperature,
Reverse is spontaneous

+