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Related Concept Videos

Arrhenius Plots02:34

Arrhenius Plots

The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used to...
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Multi-Step Reactions02:31

Multi-Step Reactions

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...
Clausius-Clapeyron Equation02:35

Clausius-Clapeyron Equation

The equilibrium between a liquid and its vapor depends on the temperature of the system; a rise in temperature causes a corresponding rise in the vapor pressure of its liquid. The Clausius-Clapeyron equation gives the quantitative relation between a substance’s vapor pressure (P) and its temperature (T); it predicts the rate at which vapor pressure increases per unit increase in temperature.
The Clausius–Clapeyron Equation01:29

The Clausius–Clapeyron Equation

The Clausius-Clapeyron equation is a fundamental principle in physical chemistry and thermodynamics that describes the relationship between a substance's vapor pressure and temperature. Named after Rudolf Clausius and Benoît Paul Émile Clapeyron, the equation is integral in predicting a substance's behavior under different temperature conditions.The Clausius-Clapeyron equation allows us to calculate how the pressure at which a liquid boils (its vapor pressure) changes as the temperature changes.

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Related Experiment Video

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Characterizing Electron Transport through Living Biofilms
08:52

Characterizing Electron Transport through Living Biofilms

Published on: June 1, 2018

The Arrhenius equation revisited.

Micha Peleg1, Mark D Normand, Maria G Corradini

  • 1Department of Food Science, Chenoweth Laboratory, University of Massachusetts, Amherst, MA 01003, USA. micha.peleg@foodsci.umass.edu

Critical Reviews in Food Science and Nutrition
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

The Arrhenius equation

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Area of Science:

  • Food science
  • Chemical kinetics
  • Biotechnology

Background:

  • The Arrhenius equation is commonly used to model temperature effects on reaction rates in food systems.
  • However, its applicability is limited for processes with optimal temperatures or complex kinetics.
  • Linear Arrhenius plots are often misinterpreted as validation, leading to assumptions about activation energy.

Purpose of the Study:

  • To evaluate the limitations of the Arrhenius equation in food systems.
  • To propose and validate alternative models for describing temperature-dependent reaction rates.
  • To challenge the traditional interpretation of Arrhenius plot linearity.

Main Methods:

  • Mathematical analysis of the Arrhenius equation and alternative models.
  • Computer simulations to test model performance.
  • Reprocessing of classical kinetic data and published food system results.

Main Results:

  • The Arrhenius equation's limitations are significant for many food processes.
  • Alternative models, like the exponential model, can accurately describe temperature dependencies.
  • Apparent Arrhenius plot linearity may stem from mathematical properties, not true activation energy.

Conclusions:

  • Simpler, empirical models can replace the Arrhenius equation in food science.
  • Relying solely on Arrhenius plots for activation energy can be misleading.
  • Alternative models offer a more robust approach to understanding temperature effects on food processes.