What are London forces? How are they affected by the sizes...

Name: Problem 5, Chapter 11: Chemistry: The Molecular Nature of Matter
Uploaded: 2021-06-27T05:16:30-08:00
Duration: 1 min 7 s
Channel: Dr. Satish Ingale
Description: What are London forces? How are they affected by the sizes of the atoms in a molecule? How are they affected by the number of atoms in a molecule? How are they affected by the shape of a molecule?

What are London forces? How are they affected by the sizes of the atoms in a molecule? How are they affected by the number of atoms in a molecule? How are they affected by the shape of a molecule?

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Key Concepts

Molecular Shape

The shape of a molecule influences the magnitude of London forces by determining the extent of contact between adjacent molecules. Molecules with elongated or extended shapes have a larger surface area that can interact with neighboring molecules, leading to stronger dispersion forces compared to more compact, spherical molecules.

Molecular Size

The size of a molecule affects London dispersion forces because larger molecules generally have more electrons, which makes them more polarizable. An increased number of electrons enhances the magnitude of induced dipoles, thereby increasing the strength of the dispersion forces.

London Dispersion Forces

London dispersion forces are a type of intermolecular force arising from temporary fluctuations in the electron density within atoms and molecules, which create instantaneous dipoles. These forces are present in all substances, but are the only intermolecular forces acting in nonpolar molecules.

Polarizability

Polarizability refers to the ease with which the electron cloud of an atom or molecule can be distorted, inducing a temporary dipole moment. A more polarizable electron cloud, as found in larger atoms with more electrons, leads to stronger instantaneous dipoles and therefore stronger London dispersion forces.

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