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General Chemistry · Modules 1 to 17

See It: General Chemistry

See chemistry happen. Every module shows each idea three ways at once: what you see in the beaker, what the atoms and molecules are actually doing, and the equation or number that describes it. Walkthroughs include animated worked examples where you watch the units cancel, and every Lab has a simulator, a practice-problem trainer with hints, a game and real-life chemistry. Everything runs in your browser on a computer, tablet or phone. No login, nothing graded.

How to use this: open the walkthrough first and go at your own pace with the arrow keys or Next. Then open the Lab: run the simulator, then practice in the Problem Trainer, using the hints and the animated worked solutions. Use the tools bar at the top of each page to pause the animations, slow them down, have the text read aloud, or get a written description of each picture.

Module 1 Measurement, units and dimensional analysis

Classifying matter, the metric system, significant figures, density, temperature and the master skill of unit conversion.

Start here · Animated walkthroughMeasurement, units and dimensional analysis WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 1 LabMeasurement bench, problem trainer, sorting rounds, and real-life scenarios.

Module 2 Atoms, isotopes and the periodic table

From Dalton to Rutherford's nucleus, isotopes, average atomic mass, and how the periodic table is organized.

Start here · Animated walkthroughAtoms, isotopes and the periodic table WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 2 LabAtom builder and gold-foil simulator, problem trainer, periodic table game, and real-life scenarios.

Module 3 Light, electrons and orbitals

Light as waves and photons, line spectra, the Bohr model, orbitals and electron configurations.

Start here · Animated walkthroughLight, electrons and orbitals WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 3 LabPhoton and atom simulator, photoelectric bench, configuration builder, trainer, and real-life scenarios.

Module 4 Periodic trends

Effective nuclear charge and how it explains size, ionization energy, electron affinity and electronegativity.

Start here · Animated walkthroughPeriodic trends WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 4 LabTrend explorer, rank-them trainer, placement game, and real-life scenarios.

Module 5 Ionic and covalent bonding

Why atoms bond, ionic lattices, covalent sharing, polarity, Lewis structures, resonance and naming.

Start here · Animated walkthroughIonic and covalent bonding WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 5 LabBonding simulator, naming and ΔH trainer, Lewis structure builder, and real-life scenarios.

Module 6 Molecular shape and polarity

VSEPR shapes in 3D, molecular polarity, hybridization, sigma and pi bonds, and molecular orbitals.

Start here · Animated walkthroughMolecular shape and polarity WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 6 LabShape builder, polarity field bench, predict-the-shape trainer, matching game, and real-life scenarios.

Module 7 Moles and stoichiometry

Making the mole tangible: molar mass, formulas, balancing equations, limiting reactants and yield.

Start here · Animated walkthroughMoles and stoichiometry WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 7 LabReaction particle simulator, balancing game, stoichiometry trainer, and real-life scenarios.

Module 8 Reactions in aqueous solution

Water as a solvent, electrolytes, molarity, precipitation, net ionic equations, acid-base and redox reactions.

Start here · Animated walkthroughReactions in aqueous solution WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 8 LabMixing bench, dilution simulator, problem trainer, sorting rounds, and real-life scenarios.

Module 9 Gases

Pressure, kinetic molecular theory, the gas laws, partial pressures, molecular speeds and real gases.

Start here · Animated walkthroughGases WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 9 LabGas piston simulator, speed and effusion bench, problem trainer, which-law game, and real-life scenarios.

Module 10 Thermochemistry

Energy, heat and work, exothermic and endothermic changes, calorimetry, Hess's law and enthalpies of formation.

Start here · Animated walkthroughThermochemistry WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 10 LabCalorimetry bench, problem trainer, Hess's law puzzle, and real-life scenarios.

Module 11 Intermolecular forces, liquids and solids

Dispersion forces, dipoles and hydrogen bonds, liquid properties, vapor pressure, phase changes and solids.

Start here · Animated walkthroughIntermolecular forces, liquids and solids WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 11 LabHeating simulator, vapor pressure and phase diagram bench, trainer, sorting game, and real-life scenarios.

Module 12 Solutions and colligative properties

How things dissolve, solubility, concentration units, colligative properties and osmosis.

Start here · Animated walkthroughSolutions and colligative properties WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 12 LabDissolving simulator, osmosis and colligative bench, problem trainer, sorting game, and real-life scenarios.

Module 13 Chemical kinetics

Reaction rates, collision theory, activation energy, rate laws, half-life, mechanisms and catalysts.

Start here · Animated walkthroughChemical kinetics WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 13 LabReaction chamber, rate law bench, problem trainer, sorting game, and real-life scenarios.

Module 14 Chemical equilibrium

Dynamic equilibrium, K and Q, ICE tables, Le Chatelier's principle and solubility equilibria.

Start here · Animated walkthroughChemical equilibrium WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 14 LabEquilibrium reactor, ICE table trainer, problem trainer, Le Chatelier game, and real-life scenarios.

Module 15 Acids, bases and buffers

Proton transfer, pH, strong and weak acids and bases, buffers, and titration curves built live.

Start here · Animated walkthroughAcids, bases and buffers WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 15 LabTitration bench, buffer stress test, problem trainer, sorting game, and real-life scenarios.

Module 16 Entropy, free energy and electrochemistry

Why reactions happen: entropy, Gibbs free energy, K, and how redox reactions power batteries.

Start here · Animated walkthroughEntropy, free energy and electrochemistry WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 16 LabGalvanic cell builder, free-energy explorer, problem trainer, sorting game, and real-life scenarios.

Module 17 Nuclear chemistry

The nucleus, radioactive decay, half-life and dating, radiation safety, medical isotopes and nuclear energy.

Start here · Animated walkthroughNuclear chemistry WalkthroughSee it in the beaker, at the particle level and in the equation, all at once, with animated worked examples. Simulators + practiceModule 17 LabHalf-life simulator, decay bench, shielding and distance bench, problem trainer, and real-life scenarios.