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Freezing Point Depression quiz #1

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  • 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 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 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 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 solute will lower the freezing point the most in 1 L of H₂O?
    The solute that dissociates into the most particles and is present at the highest molality will lower the freezing point the most.
  • What determines the liquid with 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.
  • What determines the liquid with 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.
  • What factors determine which aqueous solution will have the lowest freezing point according to the concept of freezing point depression?
    The solution with the lowest freezing point will have the highest value of i × m, where 'i' is the Van't Hoff factor (number of particles the solute produces in solution) and 'm' is the molality (moles of solute per kilogram of solvent). A higher i × m means a greater freezing point depression.
  • How does adding more solute to a solvent affect the freezing point of the resulting solution?
    Adding more solute to a solvent lowers the freezing point of the solution compared to the pure solvent, due to freezing point depression. The greater the amount of solute (and the higher the Van't Hoff factor), the lower the freezing point.