AP Chemistry
Review AP Chemistry study guides, quizzes, and flashcards covering chemical equilibrium, thermodynamics, and atomic structure.
Topics
Acids, Bases, and pH
Master the core principles of acid-base chemistry, from Brønsted-Lowry proton transfer and conjugate acid-base pairs to water's autoionization and the Kw equilibrium constant. This pack covers strong versus weak acids and bases, Ka and Kb expressions, and the logarithmic pH scale — giving you the conceptual foundation and quantitative tools needed to confidently tackle solution chemistry problems.
Aqueous Solutions and Solubility
Dissolve the complexity of aqueous chemistry by working through solubility equilibria, the like-dissolves-like principle, and the hydration of ionic compounds. This pack covers Ksp and ion product calculations, precipitation predictions, the common ion effect, and how temperature and pressure influence solubility — including Henry's Law for gases. Ideal for students tackling solution chemistry and equilibrium together.
Atomic Theory
Trace the evolution of atomic theory from Dalton's solid sphere to Bohr's planetary model, and master the core concepts driving each revision. This pack covers atomic structure, protons, neutrons, and electrons, isotopes and weighted atomic mass, electron energy levels, and ion formation — everything you need to understand how atomic models explain chemical behavior and reactivity.
Balancing Chemical Equations
Master the step-by-step process of balancing chemical equations using whole-number coefficients, the law of conservation of mass, and strategic sequencing — starting with the most complex molecule and saving monoatomic elements for last. This pack covers coefficient rules, physical state symbols, and reducing coefficients to their lowest whole-number ratio so every equation is fully correct.
Buffers and Acid-Base Titrations
Master the chemistry of buffers and acid-base titrations by working through the Henderson-Hasselbalch equation, buffer effective range, and titration curve analysis. This pack covers equivalence point pH differences for strong and weak acid-base pairs, conjugate base hydrolysis, and indicator selection — everything you need to interpret titration curves and solve buffer problems with confidence.
Chemical Kinetics
Master the core principles of chemical kinetics, from writing rate laws and identifying reaction orders to applying the Arrhenius equation and integrated rate laws. This pack breaks down reaction mechanisms, rate-determining steps, and the role of catalysts in lowering activation energy — giving you the tools to analyze how concentration, temperature, and other factors control reaction rates.
Determining Empirical and Molecular Formulas
Master the step-by-step process of converting percent composition and combustion analysis data into empirical and molecular formulas. This pack covers mole ratio calculations, handling tricky decimal ratios, and applying the empirical-to-molecular formula multiplier — with examples ranging from simple compounds like water to more complex molecules like glucose.
Electrochemistry and Redox Cells
Master the principles behind galvanic and electrolytic cells, from oxidation at the anode and reduction at the cathode to calculating E°cell using standard reduction potentials. Covers salt bridges, the standard hydrogen electrode, the Nernst equation for real-world conditions, and applications like electroplating — everything you need to confidently tackle electrochemistry on your next exam.
Electron Configuration and Atomic Structure
Unpack the rules governing how electrons fill atomic orbitals — including the Aufbau principle, Pauli exclusion principle, and Hund's rule — and see how these principles connect to periodic table structure. This pack covers s, p, d, and f subshells, notable exceptions like chromium and copper, and how core versus valence electrons influence reactivity and chemical bonding.
Equilibrium Constants
Master the math and meaning behind equilibrium constants, including how to write expressions for Kc and Kp, apply the relationship Kp = Kc(RT)^Δn, and exclude pure solids and liquids correctly. This pack also covers interpreting K values to identify product- or reactant-favored reactions, using the reaction quotient Q to predict equilibrium shifts, and manipulating K algebraically when reactions are reversed or rescaled.
Gases and Gas Laws
Master the core principles behind gas behavior by working through Boyle's, Charles's, and Avogadro's Laws, the Ideal Gas Law (PV = nRT), and Dalton's Law of Partial Pressures. This pack also covers Kinetic Molecular Theory and real gas deviations, making it ideal for students who need a thorough understanding of how pressure, volume, temperature, and moles interact.
Hydrolysis of Salts
Unpack the chemistry behind why dissolved salts shift pH above or below 7. This pack covers ion hydrolysis mechanisms, how to classify salts from strong/weak acid-base pairs, and how to calculate solution pH using the Kw, Ka, and Kb relationships — including the trickier case of salts derived from both a weak acid and a weak base.
Intermolecular Forces and States of Matter
Unpack the electrostatic forces that govern how matter behaves — from London dispersion and dipole-dipole interactions to hydrogen bonding between electronegative atoms. This pack connects IMF strength to measurable properties like boiling point, viscosity, and surface tension, then traces how those forces drive phase transitions between solids, liquids, and gases.
Ionic and Covalent Bonding
Break down the key distinctions between ionic and covalent bonding, from electron transfer and electronegativity differences to shared electron pairs, bond order, and dipole moments. Covers how bond character shifts from nonpolar to polar to fully ionic, plus how ionic crystal lattice structures explain high melting points and conductivity — exactly what you need for bonding units.
Le Châtelier’s Principle
Master the logic behind chemical equilibrium shifts with this focused study pack on Le Châtelier's Principle. Cover how changes in concentration, pressure, and temperature drive forward or reverse reactions, why heat behaves as a reactant or product depending on ΔH, and how Q versus K determines the direction of any shift.
Lewis Structures
Draw out and decode the electron arrangements that hold molecules together with this study pack on Lewis structures. Cover valence electron counting, the octet rule, lone pairs versus bonding pairs, double and triple bond formation, formal charge calculations, and resonance structures. Perfect for students who need to confidently build and evaluate Lewis diagrams for any molecule or ion.
Limiting Reactants
Master the core calculations behind limiting reactants, theoretical yield, and percent yield. Work through stoichiometric mole ratios to identify which reagent runs out first, quantify excess reactants left over, and understand why real reactions fall short of theoretical output due to side reactions and purification losses.
Molecular Geometry
Master the logic behind molecular shapes by working through VSEPR theory, electron vs. molecular geometry, and the five fundamental geometries — from linear to octahedral. See how lone pairs compress bond angles below ideal values and learn to predict molecular polarity by analyzing bond dipoles and symmetry. Perfect for students tackling shape-based reasoning and dipole moment problems.
Oxidation Reduction Reactions
Master the mechanics of electron transfer by working through oxidation states, half-reactions, and the rules for balancing redox equations in both acidic and basic solutions. This pack clarifies how to identify oxidizing and reducing agents, apply the half-reaction method, and connect redox principles to real-world applications like electrochemical cells and cellular respiration.
Periodic Trends
Trace the patterns that govern atomic behavior across the periodic table, from atomic radius and ionization energy to electronegativity and metallic character. This pack unpacks how effective nuclear charge and electron shielding drive nearly every major trend, including tricky exceptions in electron affinity at half-filled and fully filled subshells — giving you the conceptual foundation to predict and explain element properties with confidence.
pH and pOH Concepts
Master the relationship between pH, pOH, and ion concentrations using the logarithmic scale and water's autoionization constant Kw. This pack covers H⁺ and OH⁻ calculations, the pH + pOH = 14 rule, and how strong versus weak acids and bases affect your approach — giving you the core tools needed for aqueous solution problems.
Solutions and Concentration
Master the core principles of solutions and concentration, from how solutes dissolve uniformly into solvents to calculating molarity and applying the dilution equation M₁V₁ = M₂V₂. This pack also covers preparing solutions using volumetric flasks and using solution stoichiometry to connect molarity and volume to mole ratios in balanced equations.
Stoichiometry and Mole Ratios
Master the quantitative heart of chemistry by working through mole ratios, limiting reagents, and percent yield calculations. This pack breaks down the three-step conversion pathway — grams to moles, mole ratio, moles to desired units — and shows how balanced equation coefficients drive every stoichiometric relationship. Ideal for students tackling reaction calculations involving molar mass, theoretical yield, and reactant constraints.
Thermodynamics and Gibbs Free Energy
Unpack the thermodynamic principles that predict whether chemical reactions occur spontaneously, including enthalpy, entropy, and the Gibbs free energy equation ΔG = ΔH − TΔS. This pack covers how temperature shifts spontaneity, how to calculate standard free energy changes from formation data or the equilibrium constant K, and how ΔG° connects directly to whether products or reactants are favored at equilibrium.