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Related Concept Videos

Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Thermochemical Equations

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For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the enthalpy of reaction (also called the heat of reaction, ΔHrxn) is equal to the heat exchanged with the surroundings (qp).
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Thermodynamics: Chemical Potential and Activity01:10

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The effective concentration of a species in a solution can be expressed precisely in terms of its activity. Activity considers the effect of electrolytes present in the vicinity of the species of interest and depends on the ionic strength of the solution. The activity of a species is expressed as the product of molar concentration and the activity coefficient of the species.
The thermodynamic equilibrium constant is more accurately defined in terms of activity rather than concentration.
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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Developing chemical kinetic models for thermochemical applications.

Marco Mehl1, Matteo Pelucchi1, Luna Pratali Maffei1

  • 1CRECK Modeling Lab, Department of Chemistry, Materials, and Chemical Engineering 'G. Natta', Politecnico di Milano, Milan, Italy.

Nature Protocols
|July 16, 2025
PubMed
Summary
This summary is machine-generated.

This study outlines a general procedure for developing robust chemical kinetic models for thermochemical processes like pyrolysis and combustion. The methods ensure modularity, validation, and broad applicability, balancing accuracy with computational efficiency for reliable fuel behavior prediction.

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Area of Science:

  • Chemical kinetics
  • Thermochemical applications
  • Computational modeling

Background:

  • Accurate chemical kinetic models are crucial for understanding and predicting thermochemical processes such as pyrolysis, gasification, and combustion.
  • Existing models often lack modularity, comprehensive validation, or applicability across diverse conditions, limiting their predictive power.

Purpose of the Study:

  • To present a general, systematic procedure for developing chemical kinetic models for thermochemical applications.
  • To create models that are modular, thoroughly validated, broadly applicable, and balance accuracy with computational cost.

Main Methods:

  • A hierarchical approach is used, starting with light species and progressively adding heavier compounds based on archetypal species and analogy rules.
  • Reaction rate parameters are compiled to generate detailed or semi-detailed reaction mechanisms.
  • Model validation is performed using literature data and/or custom experiments, followed by optional mechanism reduction via lumping and sensitivity analyses.

Main Results:

  • The procedure yields chemical kinetic models with enhanced modularity, validation, and generality.
  • The developed models offer improved predictivity for fuel behavior across various conditions.
  • The approach allows for extrapolation of fuel behavior with higher confidence compared to models built from inconsistent sources.

Conclusions:

  • The presented procedure provides a rigorous framework for constructing reliable chemical kinetic models for thermochemical applications.
  • Expert knowledge is essential for developing reaction rate rules and identifying pathways, ensuring model accuracy.
  • These systematically developed models enhance confidence in predicting fuel behavior beyond validation conditions.