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Related Concept Videos

Calculations of Electric Potential II01:27

Calculations of Electric Potential II

An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
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The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

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Related Experiment Video

Updated: May 11, 2026

Finite Element Modelling of a Cellular Electric Microenvironment
08:23

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Published on: May 18, 2021

Molecular electrostatic potential as a graph.

Edgar E Daza1, Julio Maza, Raul Torres

  • 1Grupo de Quimica Teorica and CeiBA, Universidad Nacional de Colombia, Cra 30 45-03, Bogota, Colombia. eedazac@unal.edu.co

Current Computer-Aided Drug Design
|May 25, 2013
PubMed
Summary

This study introduces a graph-based method to represent molecular electrostatic potential, enabling efficient molecular comparison and classification using tree graph analysis. This approach simplifies complex molecular data for better understanding.

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Area of Science:

  • Computational chemistry
  • Cheminformatics
  • Graph theory

Background:

  • Molecular electrostatic potential (MEP) is crucial for understanding molecular interactions.
  • Representing MEP efficiently for large-scale comparison remains a challenge.

Purpose of the Study:

  • To develop a novel graph-based representation of molecular electrostatic potential.
  • To enable efficient comparison and classification of molecules using their MEP.

Main Methods:

  • Representing MEP as a graph using critical points and their topological relationships.
  • Reducing molecular electrostatic comparison to tree-type graph comparison.
  • Developing and presenting algorithms for tree graph comparison.

Main Results:

  • A robust graph representation of molecular electrostatic potential was established.
  • The method successfully reduces molecular comparison to graph comparison.
  • Algorithms for comparing tree-type graphs were demonstrated.

Conclusions:

  • The proposed graph-based MEP representation offers an effective approach for molecular comparison.
  • This method facilitates the classification and analysis of molecules based on their electrostatic properties.