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Chemical Nomenclature
 

Chemical Nomenclature

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    Chemical Nomenclature Chemical Nomenclature Presentation Transcript

    • CHEMICAL NOMENCLATURE
    • Chemical Nomenclature
      • System of names used to distinguish compounds from each other and the rules needed to devise these names
    • Ionic vs Molecular compounds
      • Separate system for each, so the first step is to identify whether the compounds are ionic or molecular
      • Here are two general rules:
        • Ionic= metal + non-metal
        • Molecular=non-metal + metal
    • Binary ionic compounds
      • Binary=two
      • A binary compound is a compound in which only two elements are present
      • A binary ionic compound is an ionic compound in which one element present is a metal and the other is a non-metal, such as
        • NaCl
    • Rules for naming binary ionic compounds
      • First word=name of metal
      • Second word=stem name of nonmetal + ide
      • Let’s try a few:
        • NaCl
          • Sodium chloride
        • MgF 2
          • Magnesium flouride
        • Na 2 O
          • Sodium oxide
    • Binary molecular compounds
      • A molecular compound in which only two non-metallic elements are present
      • Rule:
        • First word: numerical prefix + full name of nonmetal
        • Second word: numerical prefix + stem name of second nonmetal + ide
    • Binary molecular compounds
      • Common numerical prefixes:
        • Mono=1
        • Di=2
        • Tri=3
        • Tetra=4
        • Penta=5
        • Hexa=6
    • Binary Molecular Compounds
      • Let’s try a few:
        • N 2 0 5
          • Dinitrogenpentoxide
        • PF 3
          • Phosphorous trifluoride
        • SiCl 4
          • Silicon tetrachloride
    • Binary Molecular Compounds that have Common Names
      • Common name: not based on IUPAC* rules and has no information about composition of compound
        • H 2 O=water
        • H 2 O 2 =hydrogen peroxide
        • NH 3 =ammonia
        • CH 4 =methane
      • *IUPAC=International Union of Pure and Applied Chemistry