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The NIST Chemical Kinetics database provides the chemical kinetics community with a tool for rapidly examining experimental and theoretical studies on the rates of chemical reactions as reported in the literature. Grafika v paskale abc sdelatj solnishko full. The database can find data on a specific molecular product, a particular reaction, all of the reactions of a specific. Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes. Chemical kinetics includes investigations of how different experimental conditions can influence the speed of a chemical reaction and yield information about the reaction's mechanism and transition states, as well as the construction of mathematical models that can describe the characteristics of a chemical reaction.

The peroxides from methylrhenium trioxide (MTO) and hydrogen peroxide, CH 3ReO 2(η 2-O 2), A, and CH 3Re(O)(η 2-O 2) 2(H 2O), B, have been fully characterized in both organic and aqueous media by spectroscopic means (NMR and UV−vis). In aqueous solution, the equilibrium constants for their formation are K 1 = 16.1 ± 0.2 L mol - 1 and K 2 = 132 ± 2 L mol - 1 at pH 0, μ = 2.0 M, and 25 °C. In the presence of hydrogen peroxide the catalyst decomposes to methanol and perrhenate ions with a rate that is dependent on [H 2O 2] and [H 3O +]. The complex peroxide and pH dependences could be explained by one of two possible pathways: attack of either hydroxide on A or HO 2 - on MTO. The respective second-order rate constants for these reactions which were deduced from comprehensive kinetic treatments are k A = (6.2 ± 0.3) × 10 9 and k MTO = (4.1 ± 0.2) × 10 8 L mol - 1 s - 1 at μ = 0.01 M and 25 °C. The plot of log k ψ versus pH for the decomposition reaction is linear with a unit slope in the pH range 1.77−6.50. The diperoxide B decomposes much more slowly to yield O 2 and CH 3ReO 3.

This is a minor pathway, however, amounting to.