Chromatograph

C2.1.6 Chromatography

Multiple Choice

TLC

• Solid, liquid or gas

• The part that does not move

• the part that moves

• thin-layer chromatography

• retention factor

Multiple Choice

Mobile phase

• Solid, liquid or gas

• The part that does not move

• the part that moves

• thin-layer chromatography

• retention factor

Multiple Choice

Phase

• Solid, liquid or gas

• The part that does not move

• the part that moves

• thin-layer chromatography

• retention factor

Multiple Choice

Stationary phase

• Solid, liquid or gas

• The part that does not move

• the part that moves

• thin-layer chromatography

• retention factor

Multiple Choice

Rf

• Solid, liquid or gas

• The part that does not move

• the part that moves

• thin-layer chromatography

• retention factor

Fill in the Blanks

In a chromatogram, the solvent travels 10 cm and the component travels 3 cm.

The R_f value of the component is

Fill in the Blanks

In a chromatogram the solvent travels 9 cm and the component travels 4.5 cm.

The R_f value of the component is

Fill in the Blanks

In a chromatogram the component travels 3.5 cm and the solvent travels 7.0 cm.

The R_f value of the component is .

Fill in the Blanks

In a chromatogram the component travels 5 cm and the solvent travels 20 cm.

The R_f value of the component is .

Multiple Choice

The distance moved by the solvent is

• 32mm

• 26mm

Multiple Select

The distance moved by _______ of the spot is _____ mm.

• The center

• the bottom

• 26 mm

• 32 mm

Fill in the Blanks

The Rf value for sample Y is:

Multiple Choice

Rf value of substance Z is:

• 0.76

• 1.3

Multiple Choice

Which one of the following statements would result in a bigger R_f value for an unknown substance X?

• The chromatogram was run for a shorter time.

• A mobile phase was used that X forms weaker bonds with.

• A mobile phase was used that X forms stronger bonds with.

• The chromatogram was run for a longer time.

Multiple Select

A student ran a chromatogram on an unknown sample. A sketch of his chromatogram is shown below. Use the student’s sketch of the chromatogram to decide which compounds in the table are present in the unknown sample.

• A

• B

• C