Acids, Bases, Titration
Most acid/base problems will test your knowledge of equilibrium, specifically whether or not you can determine concentration and equilibrium constants.
Contains questions regarding oxidation and reduction half reactions, standard potential of cells, free energy, electrolytic cells, galvanic cells, and electric charge of a cell in terms of coulomb and ampere.
Gas equilibrium problems will ask you to ascertain total or partial pressures, mole fraction and concentration, and equilibrium constants. You should also know how other factors such as temperature and volume of containers affect gas equilibrium.
Contains questions regarding rate law, rate constant, concentration of a compound, half life, order of a reaction, rate-determining steps, catalysts, intermediates, changing of a reaction mechanism, etc.
Contains questions regarding laboratory experiments/procedures/equipment, calculations, molar mass, and compounds/solutions and their characteristics during chemical reactions.
Identifying Compounds and Solutions
Mass Percent of a Compound
Molar Mass of an Unknown Gas
Freezing Point Depression and Cooling Curves
Titration and Stoichiometry
Most molecular bonding problems do not involve any calculations, instead they ask you to use your knowledge of bonding to explain specific characteristics of a molecule. These characteristics usually include melting/boiling/freezing points, polarity, and/or solubility. Deep understanding of intermolecular forces and Lewis structures are necessary; many bonding problems require you to draw or examine a Lewis structure.
Bonding questions may also test the properties of individual elements, particularly comparing the ionization energy, electron affinity, atomic radii, et cetera between elements.
Solubility questions are infrequent on the AP exam, but still important to know!
Thermodynamics questions require knowledge about enthalpy, entropy, and Gibb's free energy. Furthermore, you should be able to find the ΔH, ΔS, and/or ΔG of a reaction.