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What's covered

What you'll learn: 13 units, 85 topics

Grade 6–11 chemistry in textbook order, from simple to advanced: 13 units, 85 topics and 1069 interactive activities. Topic pre-tests and post-tests show progress in percent.

Units marked “Free” are open without an account. The other units are unlocked with a plan inside the app.

Unit 1

Chemistry glassware and equipment

Lab safety, equipment, measurements

7 topics · 58 activitiesFree

  1. 1.1Chemical labelingHazard symbols and warning signs8 activities
  2. 1.2Safety rules for working in the chemistry labLab safety7 activities
  3. 1.3Equipment for chemistry experimentsGlassware and equipment12 activities
  4. 1.4Experiment: measuring mass and volumeBalances, graduated cylinders, measuring methods9 activities
  5. 1.5Experiments to identify water and gasesQualitative analysis of water and gases8 activities
  6. 1.6Finding densityCalculating and measuring density9 activities
  7. 1.7Collecting and purifying gasesCollecting gases by density and solubility, drying and preparing them5 activities
Unit 2

States of matter and changes of state

Substances, their states, changes of state and diffusion

7 topics · 70 activities

  1. 2.1What is a substance?Substances and objects, pure substances and mixtures14 activities
  2. 2.2States of matterSolid, liquid, gas9 activities
  3. 2.3Changes of stateMelting, boiling, sublimation9 activities
  4. 2.4DiffusionThe spreading of particles9 activities
  5. 2.5Rate of diffusionTemperature and the rate of diffusion8 activities
  6. 2.6Techniques for obtaining substancesFiltration, evaporation, distillation12 activities
  7. 2.7Gas pressureGas pressure and the factors that affect it9 activities
Unit 3

Properties of materials

Properties of materials, metals and nonmetals

9 topics · 71 activities

  1. 3.1Properties of materialsHardness, conductivity, flexibility8 activities
  2. 3.2Materials with metallic and nonmetallic propertiesDifferences between metals and nonmetals8 activities
  3. 3.3Chemical elementsElements and chemical symbols8 activities
  4. 3.4MixturesMixtures, their types and separation methods8 activities
  5. 3.5Concentration of solutionsPercentage and mass concentration, preparing and diluting solutions8 activities
  6. 3.6SolubilitySaturated solutions, solubility and solubility curves6 activities
  7. 3.7PrecipitatesPrecipitation reactions, ion colors, identifying cations and anions9 activities
  8. 3.8Pure substancesPure substances and separating them from mixtures8 activities
  9. 3.9Physical and chemical phenomenaPhysical and chemical changes8 activities
Unit 4

Changes in materials

Acidic and basic properties, indicators, neutralization

3 topics · 32 activitiesFree

  1. 4.1Acidic and basic propertiesProperties of acids and bases12 activities
  2. 4.2IndicatorsLitmus, methyl orange, universal indicator11 activities
  3. 4.3NeutralizationAcid + base → salt + water9 activities
Unit 5

Atomic structure and periodic trends

The atom, its structure and trends in the periodic table

5 topics · 99 activities

  1. 5.1What is an atom?Protons, neutrons, electrons19 activities
  2. 5.2Characteristics of atomic structureAtomic mass, isotopes, electron shells21 activities
  3. 5.3Periodic trendsGroups, periods, atomic radius, valence42 activities
  4. 5.4Discovery of the elementsHow the elements were discovered9 activities
  5. 5.5Discovery of the periodic tableMendeleev and the periodic table8 activities
Unit 6

Inorganic substances

Acids, bases, salts, oxides

9 topics · 128 activities

  1. 6.1Oxidation stateOxidation number11 activities
  2. 6.2Atoms and ionsAtoms, cations, anions10 activities
  3. 6.3Lewis structuresElectron dot structures16 activities
  4. 6.4OxidesAcidic, basic and amphoteric oxides19 activities
  5. 6.5BasesProperties and reactions of bases17 activities
  6. 6.6AcidsProperties of acids, pH, strong and weak acids19 activities
  7. 6.7SaltsPreparing salts and their properties18 activities
  8. 6.8Structural formulasDrawing the structure of molecules10 activities
  9. 6.9Molecular modelsSpatial models of molecules8 activities
Unit 7

Chemical bonding

How atoms bond — ionic, covalent and metallic bonds

7 topics · 80 activities

  1. 7.1Chemical bondingIonic, covalent and metallic bonds15 activities
  2. 7.2Crystal lattice structuresCrystal lattices and structure13 activities
  3. 7.3ElectronegativityAn atom’s ability to attract electrons11 activities
  4. 7.4Valence electronsOuter-shell electrons11 activities
  5. 7.5Covalent bondingBonding by sharing electrons11 activities
  6. 7.6Ionic bondingBonding by transferring electrons11 activities
  7. 7.7Metallic bondingBonding in metals8 activities
Unit 8

Chemical reactions

Types of reactions, equations, heat, conservation of mass

9 topics · 133 activities

  1. 8.1What is a chemical reaction?Signs and types of reactions8 activities
  2. 8.2Word equations for chemical reactionsWriting reactions in words16 activities
  3. 8.3Types of chemical reactionsCombination, decomposition, single and double displacement20 activities
  4. 8.4Law of conservation of massConservation of mass in reactions13 activities
  5. 8.5Chemical equationsBalancing equations17 activities
  6. 8.6Redox reactionsOxidation states, electron transfer, oxidizing and reducing agents18 activities
  7. 8.7Chemical energyBond energy, energy changes13 activities
  8. 8.8Heat of chemical reactionsExothermic and endothermic14 activities
  9. 8.9Rate of chemical reactionsFactors that affect the rate14 activities
Unit 9

Chemistry and life

Pollution, uses of chemicals, discoveries

7 topics · 64 activities

  1. 9.1Water pollutionSources and effects of water pollution8 activities
  2. 9.2Soil pollutionCauses of soil pollution8 activities
  3. 9.3Air pollutionGreenhouse gases, smog, ozone9 activities
  4. 9.4Environmental pollutionPollution, acid rain, recycling11 activities
  5. 9.5Pollution by toxic chemicalsToxic substances and safety7 activities
  6. 9.6Uses of chemicalsHousehold, food, cleaning11 activities
  7. 9.7How do researchers make discoveries?Scientists, discoveries, the scientific method10 activities
Unit 10

Basic chemistry concepts

The mole, bonding, identifying ions, purity

6 topics · 92 activities

  1. 10.1The mole and stoichiometryThe mole, Avogadro’s number, reaction calculations11 activities
  2. 10.2Atomic structure and propertiesElectron configuration and the periodic table19 activities
  3. 10.3Intermolecular forcesVan der Waals forces, hydrogen bonds14 activities
  4. 10.4Identifying ions and gasesFlame colors, qualitative analysis20 activities
  5. 10.5Preparing and purifying saltsCrystallization, filtration, purification16 activities
  6. 10.6Assessing the purity of substancesMelting point, chromatography12 activities
Unit 11

Physical chemistry

Energy, electrochemistry, equilibrium, kinetics

5 topics · 93 activities

  1. 11.1Chemical energyEnthalpy, exothermic and endothermic23 activities
  2. 11.2ElectrochemistryGalvanic cells, electrolysis19 activities
  3. 11.3Chemical equilibriumLe Châtelier’s principle, equilibrium constant20 activities
  4. 11.4Chemical kineticsReaction rate, catalysts17 activities
  5. 11.5Rate of chemical reactionsRate laws and reaction mechanisms14 activities
Unit 12

Inorganic chemistry

Metals, carbonates, sulfur, nitrogen

5 topics · 75 activities

  1. 12.1Metals and alloysMetals, corrosion, the activity series17 activities
  2. 12.2CarbonatesProperties and reactions of carbonates14 activities
  3. 12.3SulfurSulfur and its compounds14 activities
  4. 12.4Properties of gasesGas laws, mixtures of gases, ideal and real gases14 activities
  5. 12.5Nitrogen and its compoundsAmmonia, the Haber process, fertilizers16 activities
Unit 13

Organic chemistry

Hydrocarbons and their derivatives

6 topics · 74 activities

  1. 13.1Basic conceptsCarbon bonding, functional groups19 activities
  2. 13.2HydrocarbonsAlkanes, alkenes, alkynes15 activities
  3. 13.3Oxygen-containing hydrocarbon derivativesAlcohols, aldehydes, carboxylic acids10 activities
  4. 13.4Cyclic hydrocarbonsBenzene and aromatic compounds10 activities
  5. 13.5Nitrogen-containing hydrocarbon derivativesAmines, amides, amino acids10 activities
  6. 13.6Halogen-containing hydrocarbon derivativesHalogenated hydrocarbons10 activities

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