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  2. Rate equation - Wikipedia

    en.wikipedia.org/wiki/Rate_equation

    The rate is first-order in one reactant (ethyl acetate), and also first-order in imidazole, which as a catalyst does not appear in the overall chemical equation. Another well-known class of second-order reactions are the S N 2 (bimolecular nucleophilic substitution) reactions, such as the reaction of n-butyl bromide with sodium iodide in acetone:

  3. Phase transition - Wikipedia

    en.wikipedia.org/wiki/Phase_transition

    First-order phase transitions exhibit a discontinuity in the first derivative of the free energy with respect to some thermodynamic variable. [6] The various solid/liquid/gas transitions are classified as first-order transitions because they involve a discontinuous change in density, which is the (inverse of the) first derivative of the free ...

  4. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    Here k is the first-order rate constant, having dimension 1/time, [A](t) is the concentration at a time t and [A] 0 is the initial concentration. The rate of a first-order reaction depends only on the concentration and the properties of the involved substance, and the reaction itself can be described with a characteristic half-life. More than ...

  5. First-order - Wikipedia

    en.wikipedia.org/wiki/First-order

    Exact first-order ordinary differential equation; First-order differential equation; First-order differential operator; First-order linear differential equation; First-order non-singular perturbation theory; First-order partial differential equation, a partial differential equation that involves only first derivatives of the unknown function of ...

  6. Reaction progress kinetic analysis - Wikipedia

    en.wikipedia.org/wiki/Reaction_progress_kinetic...

    [A] can provide intuitive insight about the order of each of the reagents. If plots of ⁠ v / [A] ⁠ vs. [B] overlay for multiple experiments with different-excess, the data are consistent with a first-order dependence on [A]. The same could be said for a plot of ⁠ v / [B] ⁠ vs. [A]; overlay is consistent with a first-order dependence on [B].

  7. Chemical kinetics - Wikipedia

    en.wikipedia.org/wiki/Chemical_kinetics

    Chemical kinetics, also known as reaction kinetics, is the branch of physical chemistry that is concerned with understanding ... In first-order ordinary equations ...

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