Polarity

Polarity

• Static electricity
  • When two different materials are rubbed together, some electrons can transfer
    • This results in an imbalance of positive and negative charges
• Partial charges at different locations on a molecule cause a polar molecule
  • Polar molecules are attracted to each other
• Polar Molecules: Molecules that are attracted to a charge because they have partial charges on them; one side is slightly negative and the other side is slightly positive
• Non-Polar Molecules: Molecules that are not attracted to a charge

• Attractive molecules
  • Partial Charges- molecules don’t share their electrons equally
    • Polar molecules; have a dipole moment
  • Non-polar molecules- share their electrons equally; have no charge
    • 2 polar bonds may cancel out if they are going in opposite directions
  • Intermolecular Forces- Attraction between molecules (not within)
    • Forces that hold liquids and solids together
      • When a substance melts or boils intermolecular forces are broken
      • When a substance condenses or freezes, intermolecular forces are formed