Intermolecular Forces

Question 1

What is another name for London forces

Answer 1

Instantaneous induced dipole interactions

Question 2

Where do London forces occur?

Answer 2

They are in non polar and polar molecules

Question 3

How are London forces made?

Answer 3

The outer electrons fluctuate to form an unequal distribution of electrons so a instantaneous dipole forms.
This dipole induces its neighbouring molecules so it forms a small electrostatic attraction and the induced dipole makes more induce dipoles in the molecule,so they are all bonded together

Question 4

How do London forces become stronger and why?

Answer 4

As the atoms size increases the London forces become stronger because the electrons can move around more because they are less attracted to the nucleus and more shielding

Question 5

Do large or small molecules have more London forces and why?

Answer 5

Larger molecules have a larger surface area so more points of contact and more places where induced dipoles can be made so it has stronger London forces

Question 6

What is a permanent dipole dipole interaction?

Answer 6

Polar molecules are attracted to each other by the opposite dipoles interacting so there is a small elelctroststic attraction between the molecules

Question 7

Are London forces of permanent dipole dipole interactions stronger?

Answer 7

Permanent dipole dipole interactions

Question 8

Where does H bonding occur?

Answer 8

H - O
H - N
H - F

The molecule must contain hydrogen joined to fluorine, oxygen or nitrogen

Question 9

Are permanent dipole dipole interactions or hydrogen bonding stronger?

Answer 9

Hydrogen bonding is stronger