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Separation of Mixtures

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Separation of Mixtures Answer Key

1. 
Which of the following can you separate physically?
  1. carbon dioxide
  2. seawater
  3. ammonia
  4. gold
2. 
What is one property involved in separating saltwater from sand?
  1. size
  2. boiling point
  3. conductivity
  4. first ionization energy
3. 
Which of the following can you separate physically from water using filtration?
  1. barium chloride
  2. ammonium chloride
  3. lead (II) chloride
  4. sodium nitrate
4. 
Boiling point is an important property involved in the separation in which of the following?
  1. saltwater
  2. an ink mixture
  3. sand and salt
  4. natural gas
5. 
Which of the following properties is involved in the separation of dyes in a plant?
  1. Distillation
  2. Evaporation
  3. Chromatography
  4. None of the above
6. 
Which of the following equations represents the [math]R_{f}[/math] value?
  1. [math]R_f="distance traveled by spot"/"distance traveled by solvent"[/math]
  2. [math]R_f="distance traveled by solvent"/"distance traveled by solution"[/math]
  3. [math]R_f="distance traveled by solvent"/"distance traveled by solute"[/math]
  4. [math]R_f="distance traveled by solution"/"distance traveled by solvent"[/math]
7. 
A pigment moves 13 cm up a column, while the solvent moves 15 cm up the column. What is the [math]R_f[/math] value?
  1. [math]R_f=1.15[/math]
  2. [math]R_f=0.87[/math]
  3. [math]R_f=1.00[/math]
  4. None of the above
8. 
A pigment moves 12 cm up a column, while the solvent moves 20 cm up the column. What is the value of [math]R_f[/math]?
  1. [math]R_f=0.6[/math]
  2. [math]R_f=1.67[/math]
  3. [math]R_f=0.03[/math]
  4. None of the above
9. 
Summarize what will happen to two substances with different boiling points during distillation.
  • The substance with the lower boiling point will evaporate and condense first, while the substance with the higher boiling point will condense second.
10. 
Identify and summarize what type of mixture can be separated by filtration.
  • A heterogeneous mixture can be separated by filtration, with one substance being insoluble and the other substance being soluble. The insoluble substance will remain on the filter, while the soluble substance will pass through the filter.
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