Intermolecular Forces

• Melting Point 


  The temperature at which a substance's solid and liquid phases are at equilibrium.

  • The stronger the IMF= Higher Melting point.
  • Higher Melting Point = Lower vapor Pressure.
• Boiling Point


  
  

  The temperature at which the vapor pressure of a substance equals atmospheric pressure.

  • Stronger the IMF's = Higher Boiling Point.
• Vapor pressure?


  The pressure exerted by a vapor at equilibrium with its liquid in a closed system.
• Ionic Bond:


  Metal bonded to a Non-Metal.
• Covalent bond:


  Non-metal bonded to a Non-metal A bond formed by atoms sharing electrons.
• Steps when answering IMF questions:

  1. What IMF is present?

  2. Compare their strengths

  3. Compare the energy needed to overcome the IMF's

  4. Conclusion