Undergoing Change - Kinetic Stability

Reactions have a start and an end thermodynamics is concerned with the end, whereas kinetics is concerned with the processes leading from the start to that end. Thermodynamic stability is concerned with the extent of formation of a species under certain specified 

Half-lives for water exchange of aquated metal ions. 

A key basic reaction in aqueous solution is water exchange, which is the process whereby a metal ion changes its coordination sphere of water molecules for other solvent water molecules. This process defines aqua metal ions as dynamic species that undergo a series of exchange reactions continuously (5.28)  

---

Catalyst performance is evaluated in terms of kinetics. Activity is a measure of how fast the catalytic reaction occurs (activity may be a reaction rate, a rate constant, or a conversion) selectivity is a measure of product distribution, such as a ratio of the rate of a desired reaction to the rate of disappearance of reactant and stability is a measure of the rate of loss of activity or selectivity during operation as the catalyst undergoes changes in structure and composition. 

Before we proceed to discuss energy changes in detail it is first necessary to be clear that two factors determine the stability of a chemical system—stability here meaning not undergoing any chemical change. These two factors are the energy factor and the kinetic factor,... 

---