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What is Physical Chemistry?01:23

What is Physical Chemistry?

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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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Chemical Equilibria: Systematic Approach to Equilibrium Calculations01:21

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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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Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Inductive Effects on Chemical Shift: Overview01:27

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Temperature Dependence on Reaction Rate02:55

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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.
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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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Information-Theoretic Perspectives on Chemical Problems: Recent Developments and Applications.

Arpita Poddar1, Pratim Kumar Chattaraj2

  • 1Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.

Entropy (Basel, Switzerland)
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

The information-theoretic approach (ITA) offers a powerful, orbital-free method to analyze molecular properties using electron density. This framework provides transparent insights into chemical stability, bonding, and reactivity.

Keywords:
conceptual DFTdensity functional theorydescriptorsinformation-theoretic approach

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Area of Science:

  • Quantum Chemistry
  • Theoretical Chemistry
  • Computational Chemistry

Background:

  • Density Functional Theory (DFT) is a cornerstone of modern computational chemistry.
  • Traditional interpretations often rely on orbital-based methods, which can be complex.
  • Electron density provides a fundamental, physically transparent description of a chemical system.

Purpose of the Study:

  • To review the theoretical underpinnings of the Information-Theoretic Approach (ITA).
  • To highlight the chemical significance and applications of Information-Theoretic (IT) descriptors.
  • To showcase ITA as a powerful density-based, orbital-free interpretation framework.

Main Methods:

  • Utilizing electron density as a probability distribution.
  • Developing and applying Information-Theoretic (IT) descriptors.
  • Analyzing molecular structure, stability, and reactivity.

Main Results:

  • IT descriptors offer physically transparent measures of electron delocalization, localization, and reorganization.
  • ITA successfully rationalizes molecular stability, bonding, and reactivity trends.
  • IT descriptors complement conceptual DFT quantities in reactivity studies.

Conclusions:

  • The Information-Theoretic Approach (ITA) provides a versatile and predictive framework for chemical analysis.
  • IT descriptors enable a unified, orbital-free understanding of chemical behavior.
  • This approach has significant potential to advance chemical interpretation and discovery.