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Molecular Compounds
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Molecular Compounds

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Transcript

  • 1. Compounds part 2: molecular compounds
  • 2. Molecular Elements
    • A molecule is a combination of two or more atoms held together by covalent bonds
    • A covalent bond occurs between the atoms of non-metals in which the two atoms share a pair of electrons
  • 3. Molecular Elements
    • A molecular element is when two or more atoms of the same element are joined by covalent bonds
    • A diatomic molecule is a molecule that is made from two atoms
    • ex.) the element chlorine is a diatomic molecule (Cl 2 )
  • 4. Diatomic Molecules
  • 5. Molecular Compounds
    • When atoms of two or more different non-metals combine, a pure substance known as a molecular compound is formed
  • 6. Molecular Compounds
    • As with molecular elements, the atoms in molecular compounds are joined together by covalent bonds
    • In each bond, the atoms share a single pair of electrons.
  • 7. Molecular Compounds
    • For example, water is a molecular compound with two covalent bonds
    • Each hydrogen atom shares one pair of electrons with an oxygen atom
  • 8. Properties
    • soft
    • low melting point
    • solutions do not conduct electricity
  • 9. Naming Molecular Compounds
    • For compounds that do not contain hydrogen:
      • Name the first element
      • Name the second element and change the ending to “-ide”
      • add prefixes to indicate the number of each atom
  • 10.  
  • 11.
    • The prefix “ mono ” is not used when the first element is only one atom
    • When “mono” is being added to oxygen , the last “o” is dropped
      • i.e. it is “ monoxide ” not “ monooxide ”
    Naming Molecular Compounds
  • 12.
    • Example 1 : N 2 O
    • Name the first element: nitrogen
    • Name the second element using “-ide”: oxide
    • Add prefixes: dinitrogen monixide
    Naming Molecular Compounds
  • 13.
    • Example 2 : PBr 3
    • Name the first element: phosphorous
    • Name the second element using “-ide”: bromide
    • Add prefixes: phosphorous tribromide
    Naming Molecular Compounds
  • 14.
    • Hydrogen is unique in many ways, and this is reflected in the naming systems
    • Many compounds containing hydrogen have been given simpler names
    • For example, dihydrogen monoxide (H 2 O) is simply called “water”
    Naming Molecular Compounds
  • 15. Naming Molecular Compounds

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