Intermolecular Forces [C]

Question 1

What are the 3 inter molecular forces?

Answer 1

London Dispersion
Dipole-Dipole
Hydrogen Bond
(In ascending strength order)

Question 2

What are London Dispersion forces?

Answer 2

They are forces that cause a temporary and induced dipoles due to electron deficiency on one side of an atom

Question 3

How are London Dispersion forces formed?

Answer 3

When the electrons in an atom are mostly on one side, causing a negative partial charge on that side and a positive partial charge on the other

Question 4

What is formed when London Dispersion happens? What is the time frame?

Answer 4

Temporary Dipole - Because the partial charge could disappear

Induced Dipole - A dipole created due to a temporary dipole nearby

They can happen and disappear very very quickly

Question 5

What are Hydrogen bonds?

Answer 5

When lone pairs of electrons forms covalent bonds with other hydrogen atoms in other molecules, creating lattices

Question 6

What are the requirements for a Hydrogen bond?

Answer 6

A molecule must have a hydrogen atom, the same molecule must also have lone pairs of electrons

Question 7

What are lone pairs of electrons?

Answer 7

Lone pairs are 2 electrons that are not involved in covalent bonding

Question 8

What are Dipole-Dipole forces?

Answer 8

They are attractive forces between the positive and negative end of a polar molecule

Question 9

How are dipole dipole forces formed?

Answer 9

The electrons in a bonding get pulled towards the more electronegative atoms

This causes different partial charges which causes an attraction between different molecules