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.