Inter-molecular Bonds

-Inter-molecular bonds exist within a molecule such as the ionic and covalent bonds
-Inter-molecular bonds exist between molecules

• If the inter-molecular is stronger it gives you a higher a BP or MP 
• There are two types of inter-molecular bonds such as Van Der Waals bonds and Hydrogen Bonds
• They are based on electron distribution 
• And two categories 

1. Dipole- Dipole Bonds
-If a molecule is POLAR the positive end of one molecule will be attracted to the negative end of another molecule (One must be negative and one must be positive)

2. London Dispersion Forces (LDF) (Count the # of electrons)
-LDF is present in all molecules
-they create the weakest bonds
-If any substance is NON-POLAR you do not need to check if the substance is Dipole Dipole because it will not exist.
-electrons are free to move around and will randomly be grouped on one side of the molecule
-this can create a temporary dipole and can cause a weak bond to form
-the more electrons in the molecule the stronger the LDF can be

3. Hydrogen Bonding
-If hydrogen is bonded to a certain element such as Flourine, Oxygen or Nitrogen the bond is highly polar
-This forms a very strong intermolecular bond