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Distillation & Floatation quiz

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  • What is the main requirement for separating components of a mixture using distillation?
    The mixture must be heterogeneous, meaning its components are in different phases and maintain their individual physical properties.
  • What physical property does distillation use to separate liquids or gases?
    Distillation separates substances based on differences in their boiling points.
  • When is simple distillation most effective?
    Simple distillation is most effective when the boiling point difference between two substances is greater than 25°C.
  • What is the main advantage of fractional distillation over simple distillation?
    Fractional distillation produces a purer product due to repeated cycles of vaporization and condensation.
  • What apparatus is unique to fractional distillation and not found in simple distillation?
    Fractional distillation uses a fractional column filled with beads to increase surface area and prolong gas travel.
  • What is the function of the beads in the fractional column?
    The beads increase surface area and lengthen the time for gas molecules to travel, promoting more cycles of vaporization and condensation.
  • What is the role of the thermometer in both distillation setups?
    The thermometer monitors the temperature to help identify differences in boiling points between the components.
  • What is a Liebig condenser used for in distillation?
    A Liebig condenser cools the vapor back into a liquid by surrounding the tube with cold water.
  • Why does simple distillation yield a less pure product compared to fractional distillation?
    Simple distillation does not have repeated vaporization-condensation cycles, so the distillate may contain a mixture of both substances.
  • What happens to the component with the lower boiling point during distillation?
    The component with the lower boiling point vaporizes first and is collected as the distillate.
  • Why is fractional distillation necessary when the boiling point difference is less than 25°C?
    Fractional distillation is necessary because simple distillation cannot effectively separate substances with close boiling points.
  • How does the number of vaporization-condensation cycles affect the purity of the distillate?
    More cycles increase the purity of the distillate by enriching the desired component and removing impurities.
  • What is the goal of distillation in terms of mole fraction?
    The goal is to achieve a high mole fraction of the desired component in the final distillate.
  • What happens to the component with the higher boiling point during distillation?
    The component with the higher boiling point remains in the original container and does not vaporize until higher temperatures are reached.
  • What is the trade-off between speed and purity in simple versus fractional distillation?
    Simple distillation is faster and yields more product, but fractional distillation is slower and produces a purer product.