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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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Stereodynamical Effects by Anisotropic Intermolecular Forces.

Daniela Ascenzi1, Mario Scotoni1, Paolo Tosi1

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|June 20, 2019
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Summary
This summary is machine-generated.

Molecular polarization from electric and magnetic fields significantly impacts low-energy collisions. Understanding these stereo-dynamic effects is crucial for controlling chemical processes involving ions and neutrals.

Keywords:
alignmentastrochemistryion-molecule reactionsorientationstereo-dynamics

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Area of Science:

  • Chemical Physics
  • Physical Chemistry
  • Atomic and Molecular Physics

Background:

  • Anisotropic intermolecular forces create electric and magnetic field gradients, inducing molecular polarization.
  • This polarization can substantially alter molecular collision outcomes, particularly at low temperatures and energies.
  • Stereo-dynamics of chemical-physical processes are not fully understood, yet are vital for controlling reactions.

Purpose of the Study:

  • To investigate the stereo-dynamic effects of molecular polarization on elementary chemical-physical processes.
  • To combine scattering, spectroscopic, and reactivity data for a comprehensive understanding.
  • To focus on small atomic ion reactions with polar neutrals due to their relevance in diverse environments.

Main Methods:

  • Integration of experimental data from scattering, spectroscopy, and reactivity studies.
  • Analysis of ion-molecule reactions, specifically focusing on the role of electric fields in alignment and orientation.
  • Examination of rate coefficients for Arrhenius and non-Arrhenius behaviors.

Main Results:

  • Electric field gradients induce molecular polarization, significantly affecting collision outcomes.
  • Ion-molecule reactions exhibit alignment/orientation phenomena driven by the ion's electric field.
  • Stereo-dynamic effects can either suppress or enhance reactivity based on reagent orientation.

Conclusions:

  • Molecular polarization and stereo-dynamics play a critical role in controlling chemical reactions.
  • The study provides insights into the behavior of ion-molecule reactions relevant to interstellar, atmospheric, and plasma environments.
  • Understanding these phenomena is key to controlling the stereo-dynamics of elementary chemical-physical processes.