9th Grade Chapter 6 Lesson 3

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  • 1. 9th Grade Chapter 6 Lesson 3 Pgs. 147-153 For Student Use Only
  • 2. Forces Between Molecules
    • Molecules have forces between them
      • Intermolecular Forces: force between molecules
      • Different molecules have different forces between them
  • 3. Intermolecular forces are divided into 4 categories.
      • -No, it is divided into 3 categories-
      • Dipolar forces: force of attraction between polar molecules
      • London forces: force that occurs between all molecules (deformed electron cloud) (this is the only one for non-polar molecules)
      • Hydrogen bonds: when hydrogen gets less of its electron and gains a positive charge and is attracted to negative molecules
  • 4. Intermolecular structure and Molecular structure determine how the atoms of a solid arrange themselves.
    • Crystalline Solids : molecules are arranged in a regular three-dimensional solids
    • Amorphous Solids: solids that are softer and easily molded and are not arranged in repeated pattern
  • 5. Intermolecular Solid
    • Melting Point: The temperature at which an object melts (the higher the temp. the more vibrations). More solid structure higher melting point
    • Boiling Point : temperature at which a the pockets of gas are released from a liquid
    • Vapor Pressure : when the molecules begin to evaporate or escape from the liquid (due to random molecular motion)
  • 6. What increases as the temperature of a liquid increases?
    • All of the above
    • None of the above
    • Boiling Point
    • Water Pressure
    • Air Pressure
  • 7. When vapor pressure in liquid equals atmospheric pressure is called?
    • Definitions:
    • Different liquids have different boiling points
    • Critical Temperature: when water vapor no longer acts like a liquid, BUT acts like a gas at any pressure
  • 8. Match the term with the definition Solubility Solvent Solute Insoluable Does not dissolve Object being dissolved The ability of one substance to be dissolved into another Object doing the dissolving The mass of the molecules Molecular Mass
  • 9. Other Info:
    • Notes:
      • Like dissolves like
        • Polar dissolves polar AND non-polar dissolves non-polar
      • Things that affect rate of solubility
        • Stirring
        • Temperature
        • Smaller (grinding) particles
        • Precipitate- when something will not dissolve unless correct conditions