Nomenclature Chemistry Example 2

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Example 2

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Name these covalent compounds: (a) CO2\text{CO}_2, (b) N2O4\text{N}_2\text{O}_4, (c) PCl5\text{PCl}_5.

Solution

  1. 1
    For covalent compounds, use Greek prefixes to indicate the number of each atom.
  2. 2
    (a) CO2\text{CO}_2: carbon dioxide (mono- is dropped for the first element).
  3. 3
    (b) N2O4\text{N}_2\text{O}_4: dinitrogen tetroxide.
  4. 4
    (c) PCl5\text{PCl}_5: phosphorus pentachloride.

Answer

(a) carbon dioxide, (b) dinitrogen tetroxide, (c) phosphorus pentachloride\text{(a) carbon dioxide, (b) dinitrogen tetroxide, (c) phosphorus pentachloride}
Covalent compound naming differs from ionic naming. Greek prefixes (mono-, di-, tri-, tetra-, penta-, hexa-) indicate the number of atoms. The second element always gets the -ide suffix.

About Nomenclature

The systematic method for naming chemical compounds according to IUPAC (International Union of Pure and Applied Chemistry) rules, ensuring that every compound has exactly one.

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