Khan Academy: Test Prep: Mcat: Chemical Processes: Alcohols and Phenols: Aromatic Heterocycles

An exploration of aromatic stability as it relates to benzene. [5:59]

Explains what intramolecular and intermolecular forces are and the different types for each. Includes lots of examples.

Explains the concept of chirality and how it is applied in the development of pharmaceuticals.

Explains what chromatography is and how its principles are applied when separating mixtures.

Explains what a buffer is, how it is prepared, how it works to resist drastic changes in pH, and the characteristics of an effective buffer. Human blood also contains a buffer which is crucial for maintaining the blood's pH.

Offers an explanation of Gibbs free energy using an analogy. [9:19]

Using an illustrated example, the difference between an endothermic and an exothermic reaction is described. The concept of enthalpy, or heat energy change, is explained, and the energy diagrams of reactions are presented.

Enzymes create the conditions needed for biochemical reactions to happen fast. The general name that chemists use for a chemical entity that increases the speed of a reaction is a "catalyst." Enzymes are biological catalysts - they...

Explains what the Uncertainty Principle developed by Werner Heisenberg is and its applications in electron movement and in quantum mechanics. [9:38]

Explains how we measure the mass of an atom. [8:33]