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General Chemistry I

Count atoms, balance reactions and see the moles add up. 3 units and 8 concepts, each with a scene to play with and practice that adapts to you.

3Units
8Concepts
4Problems to start
BeforeAfter
6 H₂ + 2 O₂ → 4 H₂OLimiting reactant: O₂. 2 H₂ left over.
Hydrogen meets oxygen. Change the amounts and see which one runs out.

First session

Stoichiometry and limiting reactants

About 15 minutes

  1. Play with the sceneOne minute with the picture above.

  2. Read the ideaTwo short lines on stoichiometry and limiting reactants.

  3. Solve 4 problemsHints are there on every step.

  4. See your weak spotSo you know what to practice next.

Start practice

What you will learn

3 units · 8 concepts

  1. Moles and reactions

    Unit 1 · 3 concepts

    1. The mole and molar mass
    2. Balancing equations
    3. Stoichiometry and limiting reactants

  2. Gases

    Unit 2 · 2 concepts

    1. The ideal gas law
    2. Partial pressures

  3. Atomic structure

    Unit 3 · 3 concepts

    1. Atomic orbitals
    2. Periodic trends
    3. Molecular geometry