Chemical Bonding

Question 1

What are Van der Waals?

Answer 1

Van der Waals forces are weak attractive forces between molecules resulting from temporary dipoles. They are the olny force of attraction between non-polar molecules.

Question 2

Are some Van der Waals forces stronger than others?

Answer 2

The strength of VdW forces increases as the molecule gets bigger.

Question 3

2 reasons why the VdW forces are stronger in larger molecules?

Answer 3

1. The relative molecular mass increases

2. The number of electrons increases.

Question 4

What are Dipole-Dipole forces?

Answer 4

Dipole-dipole forces are forces of attraction between the negative pole of one polar molecule and the positive pole of another polar molecule.

Question 5

What is hydrogen bonding?

Answer 5

Hydrogen bonds are a particular type of dipole-dipole attraction between molecules in which hydrogen atoms are bonded to nitrogen, oxygen or fluorine.

Question 6

What is the rule for dissolving covalent compounds in water?

Answer 6

LIKE DISSOLVES LIKE

Question 7

How is Ammonia (NH3) soluble in Water (H2O)?

Answer 7

It forms hydrogen bonds with the water molecules.