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    IGCSE CHEMISTRY (demo)

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    1. 2. Atoms, Elements & Compounds (DEMO)
      7 Topics
      1. 2.1 Elements, compounds and mixtures (DEMO)
      2. 2.1.1 Elements (Demo)
      3. 2.1.2 Compounds (demo)
      4. 2.1.3 Mixtures (demo)
      5. 2.2 Atomic structure and the Periodic Table (DEMO)
      6. 2.2.1 The Structure of An Atom (DEMO)
      7. 2.2.2 The Proton Number and Mass Number (Demo)
    2. 3. Stoichiometry (DEMO)
      1 Topic
      1. 3.1.0 Formulae (Demo)
    3. 6. Chemical Reactions (DEMO)
      6 Topics
      1. 6.4.0 Redox Reactions (Demo)
      2. 6.4.1 Defining Oxidation (Demo)
      3. 6.4.2 Defining Reduction (Demo)
      4. 6.4.3 Redox and electron transfer (DEMO)
      5. 6.4.4 Defining redox in terms of electron transfer (DEMO)
      6. 6.4.5 Writing half-equations to show the electron transfer (DEMO)
    IGCSE CHEMISTRY (demo) 3. Stoichiometry (DEMO) 3.1.0 Formulae (Demo)
    Lesson 2, Topic 1
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    3.1.0 Formulae (Demo)

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    Learning Outcomes

    At the end of this lesson, you should be able to:

    • write formulae of chemical compounds
    • deduce the formula of a simple compound from the relative number of atoms present