Separation Techniques

Question 1

TLC separates by

Answer 1

Polarity

Question 2

Which substances travel the TLC plate more rapidly

Answer 2

Non polar

Question 3

To separate bulk compounds one should use

Answer 3

Column chromatography

Question 4

Column/Flash chromatography separates compounds by

Answer 4

Polarity

Question 5

In flash chromatography, what compounds travel quickest down the plate

Answer 5

Less polar compounds

Question 6

Ion exchange chromatography employs what to manipulate charge

Answer 6

pH

Question 7

High Performance Liquid Chromatography uses what to separate compounds?

Answer 7

High pressure moving stationary phase to mobile phase

Question 8

What compounds elute first in high performance liquid chromatography?

Answer 8

More polar compounds due to non polar stationary phase

Question 9

Gas chromatography separates based on

Answer 9

Volatility. More volatile compounds exit faster

Question 10

Describe distillation

Answer 10

Process of raising temp of liquid until it overcomes intermolecular forces holding it together in a liquid phase. Vapor is condensed back to liquid in diff container

Question 11

When is simple distillation used?

Answer 11

When trace impurities need to be removed from pure compound

Question 12

When is fractional distillation used?

Answer 12

Used when difference between boiling points is not large. Putting compound through many condensation vaporization cycles