difference between intermolecular forces

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difference between intermolecular forces

Postby Christineg1G » Mon Nov 11, 2019 9:53 am

What are some key factors to remember when trying to distinguish between dipole-dipole, London forces, induced dipole-induced dipole, and hydrogen bonding?

Paul Hage 2G
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Re: difference between intermolecular forces

Postby Paul Hage 2G » Mon Nov 11, 2019 10:58 am

Dipole-dipole: Occurs when two molecules with atoms of different electronegativities interact to create a slight attraction between the partially positive atom in one of the molecules and the partially negative atom in the other molecule. Example: In HCl, the H is partially positive and the Cl is partially negative due to the electronegativity difference between the two atoms. Therefore, there is a slight dipole-dipole force between two HCl molecules, as the partially negative Cl of one molecule is attracted to the partially positive H of another molecule.
Induced dipole-induced dipole: occurs when a temporary dipole on one molecule (caused by movement of electrons) induces temporary dipoles on other molecules.
Hydrogen bonding: the attraction between an H atom on one molecule and a highly electronegative atom (N,O,F) on a different molecule. (Example: two H20 nearby molecules create a hydrogen bond between the partially positive H atom of one molecule and the partially negative O atom on the second molecule).
London forces: This is a very weak intermolecular force that exists between all molecules and occurs due to the constant movement of electrons.

William Chan 1D
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Re: difference between intermolecular forces

Postby William Chan 1D » Mon Nov 11, 2019 12:46 pm

Dipole-dipole interactions are attractions between polar molecules with partial charges.
Hydrogen bonding is similar to dipole-dipole interactions but is considered stronger because of the presence of hydrogen, and another strongly electronegative atom (N, O, or F)
For practical purposes, Lavelle said that Induced-dipole Induced-dipole, London Forces, Van der Waals Forces, and Dispersion forces are the same.

Maya Pakulski 1D
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Re: difference between intermolecular forces

Postby Maya Pakulski 1D » Mon Nov 11, 2019 12:49 pm

Are N, O and F the only atoms that will be involved with hydrogen bonds. Say you had a molecule without one of these could it form a hydrogen bond?

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