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Related Concept Videos

SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

9.7K
In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
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SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

10.4K
Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

12.6K
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
12.6K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

17.8K
Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
17.8K
Energy Transfer in Chemical Reactions01:16

Energy Transfer in Chemical Reactions

12.2K
Chemical reactions require sufficient energy to cause the matter to collide with enough precision and force that old chemical bonds can be broken and new ones formed. In general, kinetic energy is the form of energy powering any type of matter in motion. Imagine a person building a brick wall. The energy it takes to lift and place one brick on top of another is the kinetic energy—the energy matter possesses because of its motion. Once the wall is in place, it stores potential energy.
12.2K
Enzyme Kinetics01:19

Enzyme Kinetics

104.4K
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Reaction kinetics in open reactors and serial transfers between closed reactors.

Alex Blokhuis1, David Lacoste1, Pierre Gaspard2

  • 1Laboratoire de Physico-Chimie Théorique-UMR CNRS Gulliver 7083, PSL Research University, ESPCI, 10 Rue Vauquelin, F-75231 Paris, France.

The Journal of Chemical Physics
|April 16, 2018
PubMed
Summary
This summary is machine-generated.

We reveal how continuous-flow stirred tank reactors (CSTR) and serial transfers are equivalent under specific conditions. This finding offers new insights into molecular evolution experiments and the origins of life.

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Area of Science:

  • Chemical kinetics
  • Thermodynamics
  • Non-equilibrium systems

Background:

  • Reaction network dynamics are crucial for understanding chemical processes.
  • Continuous-flow stirred tank reactors (CSTR) and serial transfers are common experimental setups.
  • Molecular evolution research often employs serial transfer dynamics.

Purpose of the Study:

  • To extend kinetic theory and thermodynamics to out-of-equilibrium dynamics of CSTR and serial transfers.
  • To determine conservation laws and network cycles based on stoichiometry.
  • To elucidate the relationship between CSTR and serial transfer dynamics.

Main Methods:

  • Analysis of reaction network stoichiometry.
  • Derivation of conservation laws and cycle properties.
  • Mathematical modeling of CSTR and serial transfer dynamics.
  • Comparison of dynamics in a limiting case.

Main Results:

  • Conservation laws and network cycles were determined for both CSTR and serial transfer dynamics.
  • CSTR and serial transfer dynamics are shown to be equivalent under specific limiting conditions.
  • The equivalence depends on the time interval between transfers and solution fractions.

Conclusions:

  • The study provides a theoretical framework for understanding out-of-equilibrium reaction networks.
  • The equivalence of CSTR and serial transfer dynamics offers new perspectives on experimental design.
  • Findings illuminate the role of serial transfer parameters in molecular evolution studies and origins of life research.