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Freezing Point Depression quiz #1 Flashcards

Freezing Point Depression quiz #1
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  • Which of the following solutions has the lowest freezing point?
    The solution with the highest concentration of solute and the largest Van't Hoff factor (i) will have the lowest freezing point due to freezing point depression.
  • Which aqueous solution has the lowest freezing point?
    The aqueous solution with the greatest molality and Van't Hoff factor will have the lowest freezing point.
  • Which one of the following aqueous solutions would have the highest freezing point?
    The solution with the lowest concentration of solute and smallest Van't Hoff factor will have the highest freezing point, closest to that of pure water.
  • Which of the following solutions will have the lowest freezing point?
    The solution with the most particles dissolved (highest i × m) will have the lowest freezing point.
  • Which of these will cause water to change to ice?
    Lowering the temperature of water to or below its freezing point will cause it to change to ice.
  • Which of these solutions has the lowest freezing point?
    The solution with the highest solute concentration and Van't Hoff factor will have the lowest freezing point.
  • When water freezes, what happens to its physical state?
    Water changes from a liquid to a solid when it freezes.
  • Which solution has the lowest freezing point?
    The solution with the highest molality and Van't Hoff factor will have the lowest freezing point.
  • What happens to the freezing point when the pressure surrounding a substance goes up?
    For most substances, increasing pressure slightly raises the freezing point, but for water, increasing pressure lowers the freezing point.
  • Which of the following aqueous solutions is expected to have the lowest freezing point?
    The solution with the highest total concentration of dissolved particles (highest i × m) will have the lowest freezing point.
  • Which aqueous solution will have the lowest freezing point?
    The solution with the greatest number of dissolved particles per kilogram of solvent will have the lowest freezing point.
  • Which change takes place at the freezing point of a substance?
    At the freezing point, a substance changes from liquid to solid.
  • Which of the following solutions would have the lowest freezing point?
    The solution with the highest molality and Van't Hoff factor will have the lowest freezing point.
  • Which solute will lower the freezing point of 1 kg of water to -3.72°C?
    The solute that, when dissolved in 1 kg of water, produces a ΔTf of 3.72°C (using ΔTf = i × Kf × m), will lower the freezing point to -3.72°C.
  • What percentage of alcohol does not freeze under normal conditions?
    Pure ethanol (100%) has a freezing point of -114°C, so typical alcoholic beverages do not freeze at standard freezer temperatures; high-proof alcohols (above 40% by volume) generally do not freeze in a household freezer.
  • At which temperature does a substance freeze?
    A substance freezes at its freezing point, which is a characteristic temperature for each substance.
  • What is the freezing point of water?
    The freezing point of pure water is 0°C (273.15 K) at 1 atm pressure.
  • Which of the following aqueous solutions has the lowest freezing point?
    The solution with the highest concentration of dissolved particles (highest i × m) will have the lowest freezing point.
  • Which of the following solutes will lower the freezing point the most in 1 L H₂O?
    The solute that dissociates into the most particles and is present at the highest molality will lower the freezing point the most.
  • Which of the following liquids will have the lowest freezing point?
    The liquid with the highest concentration of dissolved solute and largest Van't Hoff factor will have the lowest freezing point.
  • Which of the following liquids will have the highest freezing point?
    The pure liquid or the solution with the lowest concentration of solute will have the highest freezing point.
  • How long does it take for water to freeze?
    The time for water to freeze depends on temperature, volume, and conditions, but at 0°C, it typically takes several hours for a small volume in a household freezer.
  • What is the freezing point of argon in kelvin?
    The freezing point of argon is approximately 83.8 K.
  • What is the freezing point of fluorine?
    The freezing point of fluorine is approximately -219.6°C (53.5 K).
  • What is the freezing point of fluorine?
    The freezing point of fluorine is about -219.6°C (53.5 K).
  • Which aqueous solution has the lowest freezing point?
    The aqueous solution with the highest total concentration of dissolved particles (highest i × m) will have the lowest freezing point.