Can one be understood on the basis of the other or are they not interrelated at all?

The first thing my kinetics textbook demonstrated was how thermodynamics ignores time taken for a process whereas kinetics considers the time and rate of the process and hence kinetics is a more effective way to view change.

Also, I saw examples of highly thermodynamically feasible reactions which were not kinetically favourable in the sense that they were so slow that the entire process could be neglected as not happening.

Can one understand the thermodynamics of a reaction by studying it kinetics?

Or can one figure out the kinetics of a reaction by thermodynamical consideration?

Also, would it be a wise observation to say that thermodynamics is a largely theoretical subject while kinetics is a more experimental field?


No. Both I think are equally theoritical or experimental. You must study both seperately. Thermodynamics doesn't speak about rates. While kinetics doesn't tell you stability. If a reaction produces more than one product, thermodynamics will tell you which is more stable, while that doesn't necessarily mean it is the major product. It may happen that rate of formation of other product is more under certain conditionds. Read about thermodynamic vs kinetic product and you will get it.

  • $\begingroup$ But why is it that the two are so (at least apparently) non-interrelated. Knowledge of either yields nothing of the other right? Why is that? $\endgroup$ – shre_sudh_97 Jan 25 '16 at 11:51
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    $\begingroup$ This is because both emphasise two different things. If you look at developement of thermodynamics it was developed for handling energy in form of heat. Thermodynamics deals with macroscopic systems. So it doesn't tell about rates. $\endgroup$ – Aaditya Joshi Jan 25 '16 at 12:38
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    $\begingroup$ Consider for example a vessel in which a rxn is taking place. Thermodynamics being macroscopic science will measure heat released, enthalpy, entropy etc. It will tell you equilibrium constant. While kinetics being microscopic science will focus on a single molecule. Collision theory is an example. It will tell you rate constant and rate equation. So a reaction will only be fully studied when both aspects are studied. $\endgroup$ – Aaditya Joshi Jan 25 '16 at 13:56
  • $\begingroup$ But what is the scientific causes(or probable causes) for the disparity between what the two say? $\endgroup$ – shre_sudh_97 Jan 25 '16 at 14:06
  • $\begingroup$ That's what I am saying. The motive behind their developement itself separates them. For knowing rate microscopic study is required. While for handling heat macroscopic study is required. And hence they are not directly related. $\endgroup$ – Aaditya Joshi Jan 25 '16 at 14:10

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