Reactions Summary

ΔG = ΔH – TΔS < 0    Spontaneous    Constant T and P

Burn Sugar
C6H12O6(s) + 6O2(g) ---> 6CO2(g) + 6H2O(l)
   ΔH < 0
   ΔS > 0
   ΔG < 0  All Temperatures

Freeze Liquid
   ΔH < 0
   ΔS < 0
   ΔG < 0  Low Temperatures

Crystallize Supersaturated Solution
Sodium acetate (aq) ---> Sodium acetate (s)

   ΔH < 0
   ΔS < 0
   ΔG < 0  Low Temperatures

Slurry from two solids
Ba(OH)2(s) + NH4NO3(s) ---> H2O(l) + Ba2+(aq) + NO3–(aq) + NH3(aq)

                       

    ΔH > 0
   ΔS > 0
   ΔG < 0  High Temperatures
Un-Burn Sugar   (Photosynthesis)
6CO2(g) + 6H2O(l) ---> C6H12O6(s) + 6O2(g)
    ΔH > 0
   ΔS < 0
   ΔG < 0  No Temperature
   Must be driven by external influence.