Units
All 6 units of Chemistry 20. Each one has a concepts page to learn from, practice questions marked as you go, and quizzes built at random.
Unit 1
Unit 1: Chemical bonding and the diversity of matter
Why a bag of salt and a bottle of water behave nothing alike: ionic versus molecular, Lewis structures, the shape VSEPR predicts, and the forces between whole molecules.
Unit 2
Unit 2: Names, formulas and classifying matter
The naming system, learned once and used all year: ionic compounds including multivalent metals and polyatomic ions, molecular compounds with prefixes, and the first few organic families.
Unit 3
Unit 3: Forms of matter: gases
Pressure, temperature, volume and amount, and the four relationships that link them — plus the one equation that contains all of them.
Unit 4
Unit 4: Matter as solutions
Dissolving, solubility rules, concentration and dilution, and what is actually floating in the beaker once an ionic compound has gone in.
Unit 5
Unit 5: Acids and bases
Two definitions of an acid and why the second one is more useful, the pH scale as a logarithm, strong versus weak, and what happens at the end point of a titration.
Studying for the exam?
Mix every unit together
Build a random quiz drawn from all 72 questions across every unit, at the level you choose. It is the closest thing here to a real exam.