Module 1 Intermolecular Forces

Question 1

What are intermolecular forces?

Answer 1

Intermolecular forces are attractions between one molecule and a neighboring molecule

Question 2

What are intramolecular forces?

Answer 2

Intramolecular forces are the forces between atoms that hold them together.

Question 3

What is dipole attraction?

Answer 3

A type of attraction that only occurs between polar molecules that have permanent dipoles

Question 4

What is hydrogen bonding and when do they occur?

Answer 4

Hydrogen bonding is a special case of dipole-dipole attraction. They occur when a hydrogen atom bonds to a highly electronegative atom (Such as O, N or F)

Question 5

What are London forces? (Also known as Van er Waals)

Answer 5

London forces are the weakest forces attracting molecules to each other (1/10 to 1/100th covalent bond strength)

Question 6

What are temporary dipoles?

Answer 6

Temporary dipoles are dipoles created from the movement of electrons around an atom which leaves certain parts of the atom slightly positive When the opposite side is negative.

Question 7

What is an induced dipole?

Answer 7

An induced dipole is an atom that has slightly positive and slightly negative poles due to the repulsion of temporary dipoles positive and negative poles.

Question 8

Why do branch chain isomers have a lower boiling point than the original single chain Hydro carbon?

Answer 8

The chains cant get as close to each other so there is a weaker attraction between the branch chains than between the single chain Hydro carbons.

Question 9

When does London bonding occur?

Answer 9

London bonding occurs when