Chem4Kids covers topics like...
ATOMS: Bonds, Compounds, Ions, Naming, Electrons, Protons, Neutrons and Structure.
MATTER: States of Matter, Solids, Liquids, Crystals, Fases, Plasmas and Mixtures.
ELEMENTS: Periodic Table, Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine and Argon.
REACTIONS: Acids, Bases, Equilibrium, Thermodynamics and Rates of Reactions.
MATH: Constants, Formulas, Symbols and Units.