Learn chemistry — topic by topic
Clear, verified lessons grouped by topic. Pick a level or search — only reviewed content appears.
Beginner → advanced in sequence
🎒 High-schoolCurriculum-aligned topics
🎓 Intro collegeGen Chem I/II focus
Acids, Bases, and Buffers
Acid–base models, strong and weak acids and bases, pH/pOH, Ka/Kb, buffers, Henderson–Hasselbalch, titrations, and indicators.
Analytical Chemistry Foundations
Quantitative analysis, errors, calibration, titrations, spectroscopy basics, and chromatography overview.
Atomic Structure
Protons, neutrons, electrons, isotopes, ions, and how subatomic structure determines identity and behavior.
Chemical Bonding
Why bonds form, ionic, covalent, and metallic bonding, polarity, and the energetics of bonding.
Chemical Equilibrium
Dynamic equilibrium, Kc/Kp, reaction quotient Q, Le Châtelier, and the extent of reaction.
Chemical Kinetics
Reaction rates, collision theory, rate laws, activation energy, Arrhenius, and catalysts.
Chemical Names, Symbols, and Formulas
Reading and writing formulas, naming ions, ionic and molecular compounds, acids, hydrates, and basic organics.
Chemical Reactions and Equations
Evidence of reactions, types, word and symbolic equations, conservation, balancing, and net ionic equations.
Chemistry Foundations
What chemistry studies, how it is investigated, and how it connects to everyday life and other sciences.
Electron Configuration
Quantum numbers, orbitals, electron configurations, orbital diagrams, and valence electrons.
Gases and Gas Laws
Pressure, Boyle, Charles, Gay-Lussac, Avogadro, combined and ideal gas laws, partial pressures, and kinetic molecular theory.
Laboratory Skills, Measurement, and Safety
GHS labels, equipment, meniscus, balances, safe heating/mixing, SDS, and RAMP.
Liquids, Solids, and Phase Changes
Intermolecular forces, heating curves, phase diagrams, vapor pressure, and structures of solids.
Matter and Measurement
Classifying matter, SI units, uncertainty, and the quantitative language of chemistry.
Mole Concept and Stoichiometry
The mole, Avogadro constant, molar mass, conversions, mole ratios, limiting reactants, yields, and formula determination.
Molecular Geometry and Intermolecular Forces
VSEPR, molecular shapes, polarity, sigma/pi bonds, hybridization, and intermolecular forces including hydrogen bonding.
Nuclear Chemistry
Nuclear stability, radiation, alpha/beta/gamma, nuclear equations, half-life, fission, and fusion.
Organic Chemistry Foundations
Carbon bonding, hydrocarbons, functional groups, isomers, and introductory organic reactions.
Periodic Table and Periodic Trends
Organization of the periodic table and trends in radius, ionization energy, electron affinity, electronegativity, and reactivity — now with the 3,300-line Complete Guide flagship and full research archive at /research.
Oxidation–Reduction and Electrochemistry
Redox balancing, galvanic and electrolytic cells, potentials, Nernst, electrolysis, and Faraday laws.
Solubility and Precipitation
Solubility rules, precipitation reactions, Ksp, selective precipitation, and qualitative analysis basics.
Solutions and Concentration
Solutes, solvents, solubility, electrolytes, molarity, molality, percentage, ppm/ppb, preparation, and dilution.
Thermochemistry and Thermodynamics
Systems, surroundings, state functions, heat vs temperature, calorimetry, enthalpy, Hess law, entropy, and Gibbs energy.
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Chemistry Fundamentals from Zero
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