The reaction H2/Cl2: animation 
Atomic interpretation of a chemical reaction
Equilibring a chemical equation
Equilibring a chemical equation: tutorial
Equilibring a chemical equation: exercises
An equilibrating machine
Quantitative approach of the chemical equation
Limiting and excess reagent
Calculating with the chemical equation: method
Calculating with the chemical equation: tutorial
Calculating with the chemical equation: exercises
The yield
The yield: exercises