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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
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Multi-Step Reactions02:31

Multi-Step Reactions

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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Rate-Determining Steps03:08

Rate-Determining Steps

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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...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
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Related Experiment Video

Updated: Feb 25, 2026

Reliable Mechanochemistry: Protocols for Reproducible Outcomes of Neat and Liquid Assisted Ball-mill Grinding Experiments
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Modeling Mechanochemical Reaction Mechanisms.

Heather Adams1, Brendan P Miller2, Octavio J Furlong3

  • 1Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee , Milwaukee, Wisconsin 53211, United States.

ACS Applied Materials & Interfaces
|July 26, 2017
PubMed
Summary
This summary is machine-generated.

Mechanochemical reactions between copper and dimethyl disulfide were studied. The reaction involves sulfur deposition and copper oxidation, with kinetics modeled by elementary steps, matching experimental data.

Keywords:
Auger spectroscopyXPScopperdialkyl disulfidesin situ analysismechanochemistry

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Area of Science:

  • Surface science
  • Tribology
  • Mechanochemistry

Background:

  • Understanding surface reactions is crucial for materials science and nanotechnology.
  • Mechanochemical reactions, driven by mechanical force, offer unique reaction pathways.
  • Copper-sulfur interactions are relevant in catalysis and materials degradation.

Purpose of the Study:

  • To investigate the mechanochemical reaction between copper and dimethyl disulfide under ultrahigh vacuum (UHV).
  • To elucidate the elementary steps governing the reaction kinetics.
  • To model and validate the observed reaction dynamics using experimental data.

Main Methods:

  • Controlled experiments in ultrahigh vacuum (UHV) environment.
  • In situ monitoring of friction force variations during the reaction.
  • Kinetic modeling based on elementary mechanochemical reaction steps.
  • Surface analysis using Auger spectroscopy and X-ray photoelectron spectroscopy (XPS).

Main Results:

  • The reaction initiates with S-S bond scission, forming methyl thiolate.
  • Two key mechanochemical steps were identified: methyl thiolate decomposition and sliding-induced copper oxidation.
  • The kinetic model accurately reproduced experimental friction data and predicted sulfur content.
  • Auger and XPS analyses confirmed the amount and depth distribution of subsurface sulfur.

Conclusions:

  • The mechanochemical reaction pathway between copper and dimethyl disulfide is well-defined by elementary steps.
  • Friction force measurements provide reliable in situ monitoring of reaction kinetics.
  • The study validates a mechanistic model for surface tribochemical reactions.