FINAL EXAM REVIEW YAYAYAY~~~~~~~~~

6) List the three main types of intermolecular forces and describe how each are formed. Which intermolecular forces are the strongest and why?

1. London Dispersion Forces- between non-polar molecules (Weakest)
• step 1: two molecules get close to each other
• step 2: electrons in one molecule shift to form an instantaneous dipole (2 poles created by bonds + & -) 
• step 3: momentary dipole in one molecule induces a dipole in the other and they form an interaction
• only momentary dipole
• low temperature and bigger atoms/molecule make LDF stronger
• electrons move slower
• contain more electrons that are held less firmly by nucleus- allows them to shift & form instant dipole
• NOT A BOND ONLY A FORCE/ATTRACTION
2. Dipole Interactions- between polar molecules (2nd Strongest)
• positive pole is attracted to the negative pole
• easily broken using boil/melt
• permanent dipole
• NOT A BOND ONLY A FORCE/ATTRACTION
3. Hydrogen Bonds- (Strongest)
• FORCE OCCURRING
• Polar molecules that contain a bond between H and either O, N, or F
• large electronegativity difference creates stronger dipoles
• permanent dipole

• Hydrogen and Dipole can ALSO have LDF