Website
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Rensselaer Polytechnic Institute: Chemical Equilibrium

For Students 9th - 10th
This site from the Rensselaer Polytechnic Institute provides an introduction to chemical equilibrium, covering equilibrium expressions, the pH scale, and presenting how to plot log concentration diagrams.
Interactive
University of Colorado

University of Colorado: Ph Et Interactive Simulations: Reactions & Rates

For Students 9th - 10th
Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?
Online Course
Cosmo Learning

Cosmo Learning: General Chemistry

For Students 9th - 10th
A collection of video lectures from a general chemistry course taught at the University of California, Berkeley. The course teaches periodic table, chemical bonds, molecular shape, phase changes, chemical reactions, stoichiometry,...