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  • compound

Atoms & Molecules - Elements can combine to form compounds

  • element

  • molecule

  • compound

    • molecule containing atoms of 2 or more elements combined in a fixed ratio

    • example

      • water

      • H2O

Atoms & Molecules - Elements can combine to form compounds

  • Compounds

  • more common than pure elements

  • example., table salt (NaCl)

  • in living organisms

    • contain at least 3 or 4 different elements

    • mainly C, H, O, N

Figure 2.2 The emergent properties of a compound (Biology, 6th Ed., Campbell & Reece)

Atoms & Molecules - Elements can combine to form compounds

  • Compounds

    • described by combination of symbols and numerals

      • chemical formula (or molecular formula)

      • structural formula

Atoms & Molecules - Elements can combine to form compounds

  • chemical formula or molecular formula

  • consists of chemical symbols and numbers

  • example

  • chemical formula for water is H2O

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