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Related Concept Videos

Rate-Determining Steps03:08

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Reaction Rate02:53

Reaction Rate

The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Determining Order of Reaction02:53

Determining Order of Reaction

Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
Rate Laws and Equilibrium Constants for Elementary Reactions01:29

Rate Laws and Equilibrium Constants for Elementary Reactions

Reactions proceed through multi-step mechanisms, where each elementary step is a single process and intermediates appear only between successive steps.Elementary reactions are categorized by molecularity which is the number of molecules reacting in one step.For example, unimolecular reactions involve one molecule, bimolecular reactions involve two, and termolecular reactions involve three; higher molecularity reactions are rarer because simultaneous multi-molecule collisions are unlikely.The...
Concentration and Rate Law03:03

Concentration and Rate Law

The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:

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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Algorithm to evaluate rate constants for polyatomic chemical reactions. II. Applications.

Javier González1, Xavier Giménez, Josep Maria Bofill

  • 1Departament de Química Orgànica i Centre Especial de Recerca en Química Teòrica, Universitat de Barcelona i Parc Científic de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain.

Journal of Computational Chemistry
|April 24, 2007
PubMed
Summary

A new computational method accurately calculates chemical reaction rate constants and provides deeper insights into reaction dynamics. This approach offers a more precise lower bound compared to traditional methods.

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Area of Science:

  • Chemical kinetics
  • Computational chemistry
  • Reaction dynamics

Background:

  • The classical reaction path-Liouville algorithm is a key method for studying chemical reactions.
  • Accurate calculation of rate constants and understanding reaction mechanisms are crucial in chemistry.

Purpose of the Study:

  • To test a new implementation of the classical reaction path-Liouville algorithm.
  • To assess its utility for calculating rate constants and extracting dynamical information.
  • To characterize the role of vibrational modes in reaction mechanisms.

Main Methods:

  • Implementation of a novel classical reaction path-Liouville algorithm.
  • Application to several test chemical reactions.
  • Comparison of calculated rate constants with transition state theory results.
  • Analysis of the time-dependence of kinetic energy in vibrational modes.

Main Results:

  • The new algorithm is simple and straightforward to implement.
  • It accurately calculates rate constants for chemical reactions.
  • Results provide a new lower bound compared to traditional transition state estimates.
  • The study successfully characterized the importance of normal modes in the reaction mechanism.

Conclusions:

  • The developed algorithm offers a robust and efficient tool for chemical reaction studies.
  • It enhances the accuracy of rate constant calculations.
  • Provides valuable insights into the dynamics and mechanisms of chemical reactions.