Thursday, April 7, 2011

Intermolecular Bonds

Types of Bonds
-Intramolecular bonds exist within a molecular bond
     -Ionic, Covalent
-Intermolecular bonds exist between molecules
     -The stronger the intermolecular bonds the higher the BP or MP
     -The two types of intermolecular bonds are Van der Waals bonds and Hydrogen bonds

Vander Waals Bonds
-Based on electron distribution
-Two categories
Dipole-Dipole bonds
-If a molecule is polar the positive end of one molecule will be attracted to the negative end of another molecule

Hydrogen Bonds
-If hydrogen is bonded to certain elements (F, O, or N) the bond is highly polar
-This forms a very strong intermolecular bond

London Dispersion Forces
-LDF is present in all molecules
-Creates weakest bonds
-If a substance is non polar Dipole-Dipole forces don't exist
-Electrons are free to move around and will randomly be grouped on one side of the molecule
-This creates a temporary dipole and can cause a weak bond to form
     Kerr Pili

No comments:

Post a Comment