I. Molecular Polarity and Intermolecular Bonds
- Polarity is the result of intermolecular bonds
1. London Dispursion Force (LDF)
- Experienced by all molecules
- Result of e- pushing on each other
- weakest of all forces
- as the number of electrons increase, LDF increases
- considered as a temporary force
2. Dipole - Dipole
- Dipoles are partial separation of charges
- LDF is a type of temporary charge
- some molecules have a permanent dipole
- These are polar molecules
- Polarity is determined by electron affinity (How much an atom wants electrons)
- Electron affinity is called electron negativity
- Electron Negativity is highest on the top right and lowest on the bottom left of the periodic table
- A bond between two atoms/molecules with different electronegativities results in a dipole-dipole bond
- are weak versions of Ionic bonds