Química: lições e exercícios online

http://www.sophia.org/chemistry-topic

• Chemical Bonding
  
• 3 M's: Matter, Metrics and Measurement
  
• Solutions
  
• Acids and Bases
  
• Periodic Table and Trends
  
• History of the Atom: Atomic Structure
  
• Chemical Reactions
  
• The Mole
  
• Thermochemistry
  
• Reaction Rates and Equilibrium
  
• Stoichiometry
  
• Intermolecular Forces and States of Matter
  
• Compound Names and Formulas
  
• Gas Laws

https://www.khanacademy.org/science/chemistry/d

• Community Questions
• Introduction to the Atom
• Orbitals and Electrons
• Periodic table, trends, and bonding
• Chemical reactions (stoichiometry)
• Ideal gas laws
• States of matter
• Reaction rates
• Acids and bases
• Oxidation reduction
• Radioactive decay