Chemical Compounds
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Chemical Compounds

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This is a PowerPoint from when I was teaching chemistry. I taught chemistry for 5 years at a local private high school here in Erie, Pa.

This is a PowerPoint from when I was teaching chemistry. I taught chemistry for 5 years at a local private high school here in Erie, Pa.

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    Chemical Compounds Chemical Compounds Presentation Transcript

    • Chapter 6: Chemical Bonding
      6.2 – Covalent Bonding and Molecular Compounds
    • Molecule – neutral group of atoms that are held together by covalent bonds
      Molecular Compound – chemical compound whose simplest units are molecules
    • Chemical Formula – indicates the relative numbers of atoms of each kind in a chemical compound by using atomic symbols and numerical scripts
      Molecular Formula – shows the types and numbers of atoms combined in a single molecule of a molecular compound.
    • Diatomic Molecules – molecules containing only two atoms.
      Br2
      Cl2
      F2
      H2
      I2
      N2
      O2
    • Octet Rule
      -> Chemical compounds tend to form so that each atom, by gaining, losing, or sharing electrons, has an octet of electrons in its highest occupied energy level.
      Electron-Dot Notation – notation in which only the valence electrons of an atom of a particular element are shown. Dots are placed around the elements symbol.
    • One Valence Electron
      X
    • Two Valence Electrons
      X
    • Three Valence Electrons
      X
    • Four Valence Electrons
      X
    • Five Valence Electrons
      X
    • Six Valence Electrons
      X
    • Seven Valence Electrons
      X
    • Eight Valence Electrons
      X
    • Lewis Structure – formulas in which atomic symbols represent nuclei and inner shell electrons
      — covalent bonds
      : unshared pair of electrons
      Lone pair (unshared pair) – pair of electrons that is not involved in bonding and that belongs exclusively to one atom.
    • Double bond – covalent bond produced by the sharing of two pairs of electrons between atoms.
      • carbon, nitrogen, and oxygen can share more than one electron pair
      Triple bond – covalent bond produced by the sharing of three pairs of electron between two atoms.