Lesson Worksheet: Distillation Chemistry

In this worksheet, we will practice describing and troubleshooting distillation methods and describing their use in liquid separation and purification.

Q1:

When should distillation be used?

  • AWhen separating a mixture of liquids with different boiling points
  • BWhen a very high temperature is needed
  • CWhen separating liquids that are immiscible
  • DWhen obtaining the solute from a solution
  • EWhen separating an insoluble solid from a soluble solid

Q2:

Which of the following industrial processes does not involve fractional distillation?

  • ASeparating gases in air
  • BExtracting ethanol from a fermentation mixture
  • CMaking sulfuric acid through the contact process
  • DRefining crude oil

Q3:

The given table shows the boiling points of four liquids that are mixed together.

Molecules2-ButanolEthanoic acidEthyl ethanoateMethanol
Boiling Point (C)981187765

In what order would each liquid be collected if fractional distillation was used to separate them?

  • AEthyl ethanoate, ethanoic acid, methanol, 2-butanol
  • BEthanoic acid, 2-butanol, ethyl ethanoate, methanol
  • CMethanol, 2-butanol, ethanoic acid, ethyl ethanoate
  • DMethanol, ethyl ethanoate, 2-butanol, ethanoic acid
  • E2-Butanol, ethanoic acid, ethyl ethanoate, methanol

Ethanol has a boiling point of 78C. Why would fractional distillation not separate ethanol from the mixture?

  • AEthanol has a very similar boiling point to ethyl ethanoate.
  • BWhen heated, ethanol decomposes to ethane and water.
  • CEthanol will start to crystallize as the mixture evaporates.
  • DEthanol would not mix with the other liquids.

Q4:

When performing a distillation, why is the thermometer placed at the top of the column instead of in the solution?

  • ASo as to provide an additional surface for the vapor to condense on
  • BSo the thermometer does not contaminate the solution
  • CSo the thermometer does not break
  • DSo the temperature of the vapor is measured
  • ESo it does not block the vapor from traveling up the column

Q5:

The image below shows a piece of labware often used in fractional distillation. What name is given to this piece of labware?

  • AFunnel
  • BAdapter
  • CGas syringe
  • DCondenser
  • EConnector

Q6:

During fractional distillation, why are glass beads placed into the column?

  • ATo stop the thermometer from falling into the reaction mixture
  • BTo keep the temperature even throughout the column
  • CTo strengthen the column
  • DTo stop any liquid that condenses from falling back into the reaction mixture
  • ETo increase the surface area available for condensing the vapor

Q7:

Which technique could be used to obtain pure liquid acetaldehyde (boiling point 20C) from a mixture of acetaldehyde and ethanol (boiling point 78C)?

  • ADistillation
  • BEvaporation
  • CCentrifugation
  • DFiltration
  • ECrystallization

Q8:

Which of the following methods is the most appropriate for separating a liquid with a low boiling point from a mixture of liquids?

  • AFiltration
  • BCrystallization
  • CEvaporation
  • DCentrifugation
  • EDistillation

Q9:

Consider a mixture of methanol whose boiling point is 64.7C and water whose boiling point is 100C. Which of the following methods can be used to separate this mixture?

  • AFiltration
  • BChromatography
  • CCrystallization
  • DFractional distillation
  • EEvaporation

Q10:

The given apparatus shows the fractional distillation of a table salt solution. In which part of the apparatus is salt collected at the end of the experiment?

  • AThe distilling flask
  • BThe conical flask
  • CThe condenser
  • DThe glass beaker

This lesson includes 16 additional questions and 10 additional question variations for subscribers.

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.