1.3.3 Intermolecular forces

Question 1

What are the three types of intermolecular force in order of strength?

Answer 1

Van der Waal’s, permanent dipole-dipole, and hydrogen bonding.

Question 2

How do Van der Waals come about?

Answer 2

Small changes in the distribution of the electron cloud cause short-lived dipole moments

Question 3

What two things does the strength of Van der Waals’ forces depend on?

Answer 3

• The size of the atom or molecule; and- The area of contact between molecules

Question 4

How does dipole-dipole bonding occur?

Answer 4

When the two atoms in a covelant bond have different electronegativities

Question 5

What is hydrogen bonding?

Answer 5

Hydrogen bonding is a type of dipole-dipole bond between a hydrogen atom, and a oxygen, nitrogen or fluorine directly