chem107 unit 3 backtest

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Author:
melissag94
ID:
268962
Filename:
chem107 unit 3 backtest
Updated:
2014-04-02 15:25:30
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chem unit
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questions unit 3
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  1. the boiling point of water is increased by dissolving salt in the water, t or f
    true
  2. the solubility of gases increases significantly at higher temps, t or f
    false
  3. in normal room lighting, the eye can distinguish a true solution from a colloidal one, t or f
    false
  4. covalent, nonpolar substances tend to dissolve easily in water, t or f
    false
  5. an aqueous solution of 8.38 molal ethylene glycol would show a decrease in freezing point of 15.6 C, t or f
    true
  6. osmotic pressure is the amount of pressure required to stop the flow across a semipermeable membrane, t or f
    true
  7. the amount of freezing point depression or boiling point elevation depends only on the number of the solute particles added to the solution, t or f
    true
  8. the heavier the solute molecule is, the greater the effect on the freezing point of a solution, t or f
    false
  9. the solubility of solids in water usually increases with decreasing temperatures, t or f
    false
  10. what type of liquid displays the tyndall effect?
    colloidal suspension
  11. in the process known as osmosis, ____ moves through a semipermeable membrane in an area of ____ concentration.
    • solvent
    • higher solvent
  12. which of the following molecules can form hydrogen bonds?
    NH3
  13. London dispersion forces are based on?
    number of electrons
  14. in a solution, the solvent can be?
    a solid, liquid or gas
  15. to which elements must hydrogen be bonded in order to display hydrogen bonding?
    fluorine, oxygen and nitrogen
  16. what property of liquids explains the formation of spherical water droplets on a windshield after you apply rain X?
    surface tension
  17. in water, a substance that ionizes completely in solution is called a?
    strong electrolyte
  18. which of the following solutions would have the lowest freezing point?
    2.0 mol Ca(NO)3 dissolved in 1 L of water

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