Chromatography and Separation Techniques Quiz

Which of the following is a most appropriate reason to perform column chromatography over paper chromatography?

• The sample is a mixture of strictly polar particles

• The sample is a mixture of strictly nonpolar particles

• The goal is to separate and recover the parts of the mixture

• The densities of the component parts of the mixture differ

Tags

NGSS.HS-ETS1-3

Explain how two students could perform chromatography on the same mixture, the colored samples all move different distances, yet they can correctly identify the component parts.

A student was performing paper chromatography and let the separation continue overnight. The student wished to determine if the mixture contained a substance with an Rf factor of 0.343 where Rf = (distance travelled by the component)/(distance travelled by the solvent). What data would be affected by this error?

Explain the effect on the calculated Rf when a student lets the separation continue overnight during paper chromatography.

Which of the following would travel the farthest in column chromatography?

• CH3CH2CH2COOH

• C6H6

• CH3OH

• C8H18

In paper chromatography, what physical property is most important to the separation?

• Density

• Polarity

• Size of particle

• Molar mass of particle

A distillation of several compounds was performed. Based on the physical property provided, place the substances in order of extraction. Name Formula Boiling Point: Acetone (CH3COCH3, 56°C), Diethyl Ether (C2H5OC2H5, 34.6°C), Ethanol (C2H5OH, 78.4°C).