Exchange reactions, free energy diagram

Exchange integrals, 16,27 Exchange reactions, free energy diagram for, 89... 

A schematic diagram of the free energy changes in an electron exchange reaction, showing the intersection of two parabolas. The lighter curve represents n,c the darker one, eng, ncg. 

The success of the Marcus model is connected to the consistent description of self-exchange reactions and later to ET reactions with non-zero free energy. Using the easily measured free energy of reaction (-AGe) in the PES diagram, gives the Arrhenius rate ... 

Figure 2.9. Schematic diagram of AG versus reaction coordinate for potassium exchange on a Matapeake soil where AG is the Gibbs free energy. [From Sparks and Jardine (1981), with permission.]...

Thermodynamically, dissolution should occur whenever the fiee energy of the solvated metal ion at a givai concentration is lower than the free energy of the atom in the metal, plus the thermodynamic potential of the electrons exchanged during the reaction via the standard hydrogen electrode. Such thermodynamic conditions arc summarized in the series of potential- H phase diagrams that have been extensively collated by Poutbaix [69]. Even in cases where a metal is coveted by a thin protective oxide, deleterious corrosion effects can... 

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