This is a simple and direct explanation of the basics of reactions and equilibrium. This lesson addresses how mass is conserved in chemical reactions. This lesson has great animations and explanations of how energy is involved with chemical reactions.
Some concepts go beyond what is needed in high school.
This covers how concepts of thermodynamics influence reactions. This tutorial has questions you answer as you go along to provide feedback. This lets you practice interpreting the effects of stresses put on a chemical reaction at equilibrium. This lets you practice calculating the equilibrium constant K eq . Bring a calculator.