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Related Concept Videos

Classifying Matter by Composition03:35

Classifying Matter by Composition

Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
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Coulometry: Overview

Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
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Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
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Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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What is Physical Chemistry?

Physical chemistry is a branch of chemistry that studies the principles from physics underlying chemical reactions. It provides deep insights into the behaviors of molecules, the forces they experience, and their interactions and chemical reactions.The term "physical chemistry" was introduced by Mikhail Lomonosov in 1752. Since then, it has seen significant contributions from notable scientists such as Josiah Willard Gibbs, Wilhelm Ostwald, Jacobus Henricus van't Hoff, and Linus Pauling.Key...
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Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Published on: April 12, 2014

Semiclassical methods in chemical physics.

W H Miller

    Science (New York, N.Y.)
    |July 11, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Semiclassical theory offers a powerful framework for understanding quantum mechanics in chemical physics. It successfully describes one-dimensional systems and is advancing for complex multidimensional dynamics.

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    Area of Science:

    • Chemical Physics
    • Quantum Mechanics
    • Computational Chemistry

    Background:

    • Semiclassical theory is a vital tool in chemical physics.
    • It serves as both a computational method and a conceptual framework.
    • It aids in interpreting quantum phenomena in experiments and calculations.

    Purpose of the Study:

    • To review the application and advancements of semiclassical theory.
    • To highlight its utility in understanding quantum features in chemical dynamics.
    • To discuss its extension to multidimensional systems.

    Main Methods:

    • Review of established semiclassical methods for one-dimensional systems.
    • Exploration of recent progress in generalizing semiclassical theory to multidimensional systems.
    • Application of semiclassical concepts to interpret quantum phenomena like interference and tunneling.

    Main Results:

    • Semiclassical description of one-dimensional dynamical systems is well-established.
    • Significant progress has been made in applying semiclassical theory to multidimensional systems.
    • The theory provides valuable insights into quantum features in complex chemical systems.

    Conclusions:

    • Semiclassical theory is a versatile and effective approach in chemical physics.
    • Its application extends from simple to complex multidimensional dynamical systems.
    • It continues to be essential for interpreting quantum effects in molecular science.