TLC

Question 1

what is chromatography

Answer 1

method of separting mixutres tht relies to IMF

Question 2

Which technique in this experiment will you use to determine the active chemical drug components in the common painkillers.

TLC
Melting point
IR
NMR

Answer 2

TLC

Question 3

How far up the TLC plate should the spots ideally run so that you can calculate the most accurate Rf values?
at the top
at the bottom
in the middle
on the sides

Answer 3

in the middle

Question 4

How are you going to see (visualize) the spots on the TLC plates?
You can see them with your naked eyes.
You can see them with a flashlight.
You can see them in the dark.
You can see them with a UV lamp.

Answer 4

You can see them with a UV lamp.

Question 5

When placing the TLC plates in the developing chamber, where should the solvent line be with respect to the samples that are spotted on the TLC plate.

Above the line where the samples are spotted on the TLC plate
Below the line where the samples are spotted on the TLC plate
On the line where the samples are spotted on the TLC plate

Answer 5

Below the line where the samples are spotted on the TLC plate

Question 6

Which intermolecular force is likely to be the most important when the sample molecules are adsorbed onto the stationary phase on a TLC plate?
hydrogen bonding
dipole-dipole
induced-dipole

Answer 6

HYDROGEN BONDING

Question 7

Molecules that move from solution to the solid are said to be in the process of _________

Answer 7

adsorbing

Question 8

Molecules that move from the solid into solution are said to be in the process of _

Answer 8

desorbing

Question 8

Molecules that move from the solid into solution are said to be in the process of _

Answer 8

desorbing

Question 9

Which of the following dynamical processes contribute to the Rf values in your TLC experiments?
Rate of adsorption to the stationary phase
Rate of desorption (solvation)
Rate of solvent (mobile phase) motion
All of the above!

Answer 9

All of the above!