London Interactions

[Rose_Malki_3G]

In Wednesday's lecture, Dr. Lavelle said that London interactions are always present and attractive. What did he mean by present? Like are London dispersion forces also present in compounds with ionic or hydrogen bonds?

[EmilyC_3D]

I believe that London dispersion forces generally act as intermolecular forces between any molecules that are close to each other, regardless of type. All molecules have electrons which may be pulled/distorted slightly by London dispersion forces. For any intermolecular interaction I believe, LDF will always be happening in the background. Non-polar molecules, however, will only exhibit London dispersion forces.

[Lilly Catarozoli 1B]

From what I understand, yes, London dispersion forces are always present regardless of bond type.

[Sharon Kim 2A]

Technically, London Dispersion forces are always present. It is a matter of what forces are dominating in those interactions. Such as London Dispersion forces being present in ionic bonds but the ionic forces are more dominant.

[Madeline Louie 1I]

Induced dipole-induced dipole interactions are always present when molecules are interacting. This is because all compounds have electrons and the electrons will fluctuate to create attractive interactions.

[Emma Ide 2E]

London interactions are always present because electrons are always fluctuating, even in a neutrally charged molecule, there will still be a little bit of electron repulsion when two molecules are near each other.