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Posted: Tue Nov 13, 2018 9:55 pm
What causes an induced-dipole? What is an example of an induced-dipole between two molecules?
Posted: Tue Nov 13, 2018 10:07 pm
Dipoles are unequal pulls of electrons. Induced-dipoles happen in London dispersion forces.
What happens is that in an atom with an equal amount of electrons dispersed around, a temporary dipole force can occur.
For instance, some electrons can temporarily shift to one side, causing one side of the atom to be negative and the other to be positive, creating a dipole. This then induces another dipole to form on a nearby atom, which creates a dipole-induced-dipole bond.
Posted: Thu Nov 15, 2018 8:37 pm
An example of dipole-induced dipole would be when a molecule with a dipole (HCl for example) gets close to a molecule without a dipole. There will be attraction between the positive of the nonpolar molecule and negative part of the dipole (Cl) (or vice versa) - creating a temporary (induced) dipole in the nonpolar molecule and attraction between the dipole and the induced dipole.
Posted: Thu Nov 15, 2018 10:57 pm
Induced dipoles occur when one molecule with a permanent dipole repels another molecule's electrons. A molecule with permanent dipole can induce a dipole in a similar neighboring molecule and cause mutual attraction. Any pair of molecules where one is a dipole and other is a non polar molecule can be regarded as an example. HCl and CHCl3 are common examples.
Posted: Fri Nov 16, 2018 3:58 am
How do you know if a dipole is permanent or not. For example in the case of c5h12 from page 190 of the 7th version of the text book. (in the margins of the actual text, not a question)
Posted: Fri Nov 16, 2018 9:26 am
An induced dipole is an attraction that occurs when a polar molecule induces a dipole in an atom or in a nonpolar molecule by changing the arrangement of electrons in the nonpolar species. For example, with HCl and Argon, the electrons on an argon atom are distributed around the nucleus of the atom. But these electrons are in constant motion. When an argon atom comes close to a polar HCl molecule, the electrons can shift to one side of the nucleus to produce a very small dipole moment that lasts for only an instant, this is an induced dipole.