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Polar Bonds and Molecules (8.4). Bond Polarity Bond polarity has to do with unequal distribution of shared electrons This causes one end of the bond to have a “partial positive” ( δ + ) charge and the other to have a “partial negative” ( δ - )charge

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polar bonds and molecules 8 4
Polar Bonds and Molecules (8.4)
  • Bond Polarity
  • Bond polarity has to do with unequal distribution of shared electrons
  • This causes one end of the bond to have a “partial positive” (δ+) charge and the other to have a “partial negative” (δ-)charge
  • These types of bonds are called polar covalent bonds and are said to possess a dipole moment
what causes bond polarity
What causes bond polarity?
  • A polar bond results from a difference in electronegativity between the bonded atoms
  • The greater the difference, the more polar the bond is
  • The degree of polarity depends upon the difference in electronegativity
effect of bond polarity on molecules
Effect of Bond Polarity on Molecules
  • Polar bonds may result in polar molecules
  • Bond character (nonpolar, polar, ionic) affects
    • How molecules interact with one another
    • Physical properties of substances
polarity of molecules
Polarity of Molecules
  • A molecule as a whole has a dipole depending upon
  • The presence of polar bond(s)
  • The geometry of a molecule
  • Examples:
    • CH4
    • CO2
    • H2O