  The rates of chemical reactions are not absolute but their magnitude depends
upon the relative speeds of the moving observers. This has been proved by
unifying theories of chemical kinetics, which are transition state theory,
collision theory, RRKM and Marcus theory, with the special theory of
relativity. Boltzmann constant and energy spacing between permitted quantum
levels of molecules are quantum mechanically proved to be Lorentz variant. The
relativistic statistical thermodynamics has been developed to explain
quasiequilibrium existing between reactants and activated complex. The newly
formulated Lorentz transformation of the rate constant from Arrhenius Equation,
of the collision frequency and of the Eyring and Marcus equations renders the
rate law also Lorentz variant. For a moving observer moving at fractions of the
speed of light along the reaction coordinate the transition state possess less
kinetic energy to sweep translation over it. This results in the slower
transformation of reactants into products and in a stretched time frame for the
chemical reaction. Lorentz transformation of the half-life equation explains
time dilation of the half life period of chemical reactions and proves special
theory of relativity and presents theory of relativistic chemical kinetics in
accord with each other. To demonstrate the effectiveness of the present theory,
the enzymatic reaction of methylamine dehydrogenase and radioactive
disintegration of Astatine are considered as numerical examples.
