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Chemistry

Chemistry Lab

Snap atoms into real 3D molecules, balance equations and run reactions.

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The course

6 worlds · 56 lessons

World 1 · Atoms & Bonds

FREEFrom particles to molecules
  1. 01What is matter?Atoms, elements and states · 5 min
  2. 02Inside the atomProtons, neutrons, electrons · 7 min
  3. 03Reading the periodic tableGroups, periods and trends · 7 min
  4. 04Valence electronsThe electrons that bond · 6 min
  5. 05Ionic bondsGive and take electrons · 7 min
  6. 06Covalent bondsSharing electron pairs · 8 min
  7. 07Molecular shapes (VSEPR)Why molecules aren’t flat blobs · 8 min
  8. 08Polar moleculesWhen sharing isn’t equal · 6 min
  9. 09Build lab: CO₂ & NH₃Linear vs pyramidal · 7 min
  10. 10World 1 reviewLock in the fundamentals · 6 min
  11. 11Build an atomProtons choose the element · 6 min
  12. 12Same element, different isotopeNeutrons and mass number · 5 min
  13. 13Electrons and ionsChange the charge without changing the element · 5 min
  14. 14Shells and the periodic tableBohr shells place each element · 6 min
  15. 15Electron domains set the shapeVSEPR: domains spread out · 7 min
  16. 16Lone pairs bend the shapeElectron-domain geometry vs molecular shape · 8 min
  17. 17Five and six domainsWhere the lone pairs go · 9 min

World 2 · Reactions Lab

PROMix reagents, watch it happen
  1. 01What is a reaction?Reactants become products · 6 minPRO
  2. 02Synthesis reactionsA + B → AB · 7 minPRO
  3. 03Decomposition reactionsAB → A + B · 6 minPRO
  4. 04Single displacementA + BC → AC + B · 7 minPRO
  5. 05Double displacementPrecipitates from swapping partners · 7 minPRO
  6. 06CombustionFuel + oxygen → energy · 7 minPRO
  7. 07Acids & basesNeutralisation · 8 minPRO
  8. 08The pH scaleHow acidic is it? · 6 minPRO
  9. 09Oxidation & reductionThe electron transfer · 7 minPRO
  10. 10Solubility & precipitatesWhat dissolves, what doesn’t · 6 minPRO
  11. 11Spectacular reactionsThe showstoppers · 6 minPRO
  12. 12Free-play mixerExplore the reaction DB · 5 minPRO

World 3 · Balancing & Stoichiometry

PROThe maths of reactions
  1. 01Conservation of massAtoms are never lost · 6 minPRO
  2. 02Balancing equationsCoefficients, not subscripts · 8 minPRO
  3. 03Balancing practiceBuild the reflex · 7 minPRO
  4. 04The moleChemistry’s counting unit · 8 minPRO
  5. 05Molar massGrams per mole · 7 minPRO
  6. 06Mole ratiosReading recipes from equations · 7 minPRO
  7. 07Limiting reagentWhat runs out first · 8 minPRO
  8. 08Percent yieldTheory vs reality · 7 minPRO
  9. 09Empirical formulasSimplest whole-number ratio · 7 minPRO
  10. 10Stoichiometry in the labPut it all together · 6 minPRO

World 4 · AP Chemistry Deep

PROExam-tier mastery
  1. 01Organic chemistry introThe chemistry of carbon · 8 minPRO
  2. 02Functional groupsReactive handles · 7 minPRO
  3. 03Chemical equilibriumReactions that go both ways · 8 minPRO
  4. 04Le Chatelier’s principleStressing an equilibrium · 8 minPRO
  5. 05ThermochemistryEnergy in reactions · 8 minPRO
  6. 06Reaction ratesHow fast, and why · 7 minPRO
  7. 07Strong vs weak acidsKa and dissociation · 8 minPRO
  8. 08TitrationFinding an unknown concentration · 8 minPRO
  9. 09ElectrochemistryRedox that does work · 8 minPRO
  10. 10AP exam problem setTest yourself · 10 minPRO

World 5 · Chemical bonding: give, share or pool

PROWhere the electrons go in ionic, covalent and metallic bonds
  1. 01Ionic bonds: moving whole electronsNaCl, MgO and formulas from charges · 9 minPRO
  2. 02Electronegativity and bond polarityFrom equal sharing to ions: a continuum · 8 minPRO
  3. 03Shared pairs: why N₂ hardly reactsSingle, double and triple bonds · 9 minPRO
  4. 04Metals bend, salt shattersThe electron sea and sliding layers · 9 minPRO

World 6 · Galvanic cells: chemistry that pushes electrons

PROElectrode potentials, electron and ion flow, Nernst and Faraday
  1. 01A zinc–copper cellAnode, cathode and which way the electrons go · 10 minPRO
  2. 02Pick the metals: voltage and polarityReading a table of standard reduction potentials · 9 minPRO
  3. 03No bridge, no current; concentration and NernstWhy the voltage drifts as a cell runs down · 10 minPRO
Read first

Guides for Chemistry Lab

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Exam prep
Chemistry LabAP Chemistry Bonding and Structure: A Free Study GuideConnect atomic structure, ionic and covalent bonds, molecular shape and polarity to free interactive lessons, with a study plan and practice exam advice.4 min read
Explainer
Chemistry LabAtoms, Bonds and Molecular Shapes (VSEPR) ExplainedHow protons, electrons and valence shells lead to ionic and covalent bonds, and how VSEPR predicts the 3D shape of water, ammonia and carbon dioxide.5 min read
Explainer
Weather IslandHow the Water Cycle Works: A Simple Water BudgetFollow a drop of water through evaporation, condensation, precipitation and runoff, and learn why the total is conserved when water changes store.4 min read