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Filtration & Evaporation quiz

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  • What is the main purpose of filtration in chemistry?
    Filtration is used to separate an insoluble solid from a liquid.
  • What is the name given to the solid left behind on the filter paper after filtration?
    The solid left behind is called the residue.
  • What do we call the liquid that passes through the filter paper during filtration?
    The liquid that passes through is called the filtrate.
  • What common laboratory equipment is used to hold the filter paper during simple filtration?
    A funnel is used to hold the filter paper.
  • Why is simple filtration considered time-consuming?
    It is time-consuming because the liquid passes slowly through the filter paper by gravity.
  • What type of funnel is used in vacuum-assisted filtration?
    A Buckner funnel is used in vacuum-assisted filtration.
  • How does a vacuum pump speed up the filtration process?
    The vacuum pump creates a pressure difference that pulls the filtrate through the filter paper faster.
  • Why is vacuum filtration useful for solids that are more partially dissolved?
    Vacuum filtration lowers the temperature, which helps recrystallize the more dissolved solid.
  • What is an everyday example of filtration mentioned in the lesson?
    An everyday example is using a coffee filter in a coffee machine.
  • In the coffee filter example, what acts as the residue and what as the filtrate?
    The coffee grounds are the residue, and the liquid coffee is the filtrate.
  • What is the main purpose of evaporation (or crystallization) in separation techniques?
    Evaporation separates a soluble solid from a liquid by vaporizing the solvent.
  • What equipment is typically used to heat the mixture during evaporation?
    A Bunsen burner and an evaporation bowl are typically used.
  • What remains in the evaporation bowl after the solvent has been vaporized?
    Solid material remains after the solvent is vaporized.
  • How does the type of solid (soluble vs. insoluble) determine whether you use filtration or evaporation?
    Filtration is used for insoluble solids, while evaporation is used for soluble solids.
  • What is the key difference between filtration and evaporation as separation techniques?
    Filtration separates insoluble solids from liquids, while evaporation separates soluble solids by removing the liquid through heating.