Introducing entropy . . .
A simple, non-mathematical introduction to entropy.
Calculating entropy changes during reactions . . .
Using data book values for entropy to calculate the entropy change during a reaction.
Adding a bit of complication . . .
Looks at the various types of entropy change during a reaction: the entropy changes of the system, of the surroundings and the total entropy change, and how they are related. How to use total entropy change to predict the feasibility of a reaction.
An introduction to Gibbs free energy . . .
Introducing Gibbs free energy, and how you can use it to predict the feasibility of reactions.
The relationship between Gibbs free energy and equilibrium constants. . .
A very brief introduction to the equation relating ΔG and equilibrium constants.