1. Boiling Point of Molecules - How strong molecules are interacting with each other - The larger the dipole moment, the stronger the interaction ++ -- ++ -- ++ -- ++ -- ++ -- ++ --

2. Boiling Point of Alkanes Induced dipole-induced dipole interaction AKA van der Waals force (interaction) ++ -- ++ -- -- ++

3. Boiling Point of Molecules - Hydrogen bond - Polarized covalent bond O HH - Other example of H-bond: NH, SH, O HH OOO HHHHHH

4. Melting Point of Molecules - How well molecules are “packed” - The better the packing, the higher the melting point

5. Solubility of Molecules - How well molecules interact with solvents - solvation O H H O H H O H H ++ -- O HH O HH O H H ++ -- O HH C HH alkane methanol