L11 Molecular Polarity and intermolecular/intramolecular forces

What is a limitation of the Lewis structures?

The limitations of the Lewis structure is that it will not provide information regarding the shape of the molecule. This is because a Lewis structure is a 2-d diagram trying to represent a 3-d molecule.

What are intramolecular forces?

-forces within a molecule

-Ionic:

strong electrostatic forces between the ions

-Covalent:

polar covalent bonds

non polar covalent bonds

strong bonds within molecule

1. what are intermolecular forces?

-forces between molecules

What are the different intermolecular forces?

1. Ion dipole force

2. Dipole dipole force

3. LDF (London Dispersion Force)

4. H Bonds

What are Ion Dipole forces?

attractive force between an ion and a polar covalent molecule such as dissolving NaCl into water to create a salt water solution

What are dipole dipole forces?

-Much weaker than a intramolecular covalent bond

-attractive forces between polar molecules

What are melting points/boiling points?

refers to the energy required to overcome the intermolecular forces

What are H-bonds?

occurs between the H-atom that is bonded to either a N, O or F.

common in water

Rank the intermolecular forces from strongest to weakest

ion dipole>H-bonds>dipole-dipole>LDF

Rank the boiling points from lowest to highest

N2<HCl<H2O<NaCl