Molecular models (Chemistry)
Linear combination of atomic orbitals 
LCAO is an easy quantum mechanical method which helps determine the true wave function of a molecular orbital. This site gives an in depth explanation of the math behind LCAO and some pretty good examples.
Notes on Molecular Orbital theory
These are the slides about molecular orbital theory. I would use this as a quick review before an exam. There are some really good practical examples and explanations.
