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Nomenclature Part 3

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Nomenclature Part 3

  1. 1. Nomenclature Part 3 Naming Polyatomic and Binary Covalent Compounds Writing Formulas from Names
  2. 2. Polyatomic Ionic Compounds <ul><li>Identify and name the cation </li></ul><ul><li>Identify and name the anion (often the polyatomic ion) </li></ul><ul><li>Put the names together, naming the cation first, then the anion </li></ul>
  3. 3. Binary Covalent Compounds <ul><li>Compounds that have two elements (binary) </li></ul><ul><li>Are the combination of two non-metals </li></ul><ul><li>Electrons are SHARED, so don’t need to worry about balancing charges </li></ul>
  4. 4. Rules for Naming Binary Covalent Compounds <ul><li>The first element is named first, using the full name of the element </li></ul><ul><li>The second element is named by dropping the ending and adding the suffix -ide </li></ul><ul><li>Prefixes are used to denote the numbers of atoms present (the subscripts indicate the numbers of atoms present) </li></ul><ul><li>The prefix mono - is never used for the first element, only the second </li></ul>
  5. 5. Prefixes <ul><li>Prefix Number Indicated </li></ul><ul><li>Mono- 1 </li></ul><ul><li>Di- 2 </li></ul><ul><li>Tri- 3 </li></ul><ul><li>Tetra- 4 </li></ul><ul><li>Penta- 5 </li></ul><ul><li>Hexa- 6 </li></ul><ul><li>Hepta- 7 </li></ul><ul><li>Octa- 8 </li></ul><ul><li>Nona- 9 </li></ul><ul><li>Deca- 10 </li></ul>
  6. 6. How do I name them? <ul><li>Example: BF 3 </li></ul><ul><li>Boron trifluoride </li></ul><ul><li>The names is binary (two names) </li></ul>
  7. 7. Try these… <ul><li>NO </li></ul><ul><li>CO 2 </li></ul><ul><li>N 2 O 5 </li></ul><ul><li>CO </li></ul><ul><li>CCl 3 </li></ul>
  8. 8. Writing Formulas From Names <ul><li>Identify the Anion </li></ul><ul><li>Identify the Cation </li></ul><ul><li>Determine the total number of cations and anions needed to make the formula electrically neutral (these become the subscripts) </li></ul><ul><li>Write the formula, putting the cation first, then the anion </li></ul>

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