rate constant

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rate constant

[′rāt ‚kän·stənt]
(physical chemistry)
Numerical constant in a rate-of-reaction equation; for example, rA = kC aA C bB C cC, where CA ,CB , and CC are reactant concentrations, k is the rate constant (specific reaction rate constant), and a, b, and c are empirical constants.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Table-1: Rate constants and statistical analysis of the effect of crosslinker conc over swelling rate.
equations were used, where x is the fraction reacted, t is the reaction time (min), ks, kf and kd are the rate constants (Levenspiel, 1999; Habashi, 1969).
Reaction rate constants and product outputs of the [C.sub.2][H.sub.5] + NCO reaction at the temperature range 293 [+ or -] 2 K and the pressure range 2.1~2.5 Torr have been calculated in the experiment.
The PFO rate constants k obs were determined on the basis of the excess concentration of Fenton reagent.
where the rate constants [k.sub.12] and [k.sub.21] correspond to Scheme 1 and [K.sub.A] is the equilibrium dissociation constant of the complex RA, [K.sub.A] = [k.sub.10]/[k.sub.01].
The first volume covers science of the environmental chamber, the role of water in organic aerosol multiphase chemistry: focus on partitioning and reactivity, a critical review of atmospheric chemistry of alkoxy radicals, the role of nitric acid surface photolysis on the tropospheric cycling of reactive nitrogen species, the atmospheric chemistry of halogenated organic compounds, atmospheric reaction rate constants and kinetic isotope effects computed using the HEAT protocol and semi-classical transition state theory, and recent advances in the chemistry of OH and HO2 radicals in the atmosphere; field and laboratory measurements.
where m(0) and m(t) are the initial drug content and the cumulative MTP amount released at time t, [k.sub.on], [k.sub.off], and [k.sub.d]s are the 1st-order rate constants, and
Rate constants k ([min.sup.-1]) for each of the frying temperatures and activation energies [E.sub.a] (KJ/mol) for each of the frying treatments were determined.
The reactions of phosphate bis-ester were strappingly catalysed at different concentrations of CTABr at which pseudo first order rate constants were obtained.
4, the reaction rate constants can be distinguished based on the various temperatures as shown in Table 1.