C5-2 Chromatography

In chromatography which of the following is the mobile phase?

• The paper

• The pencil

• The solvent

• The colours

In chromatography which of the following is the stationary phase?

• The paper

• The pencil

• The solvent

• The colours

During chromatography substances constantly move between the mobile and stationary phase. What name is given to this constant movement of particles between the phases?

• separation
• stagnation
• equilibrium
• solution

In chromatography what happens to particles that spend more time in the mobile phase?

• They will remain stationary in the column on the start line

• They will travel further and move further through the stationary phase

• They will travel a shorter distance compared to other particles

• They will slow down moving more slowly through each phase

Why is pencil used to mark a chromatogram and not pen?

• Pencil does not dissolve in the solvent

• Pens are used to provide colours

• Pens are not required for paper chromatography

• Pen might dissolve in the solvent

What is the correct order?

A: Water rises taking the dye with it.

B: Dip the strip into the solvent (water).

C: Different dyes separate from the black ink.

D: Add a spot of black ink on the pencil line.

Which coloured dye is the most soluble?

• Blue

• Green

• Red

• Black

Which coloured dye is the least soluble?

• Blue

• Green

• Red

• Black

What name is given to the line marked on the top of a chromatogram?

The chromatogram shown was made from a sample of black ink.

How many colours make up the black ink?

• 0

• 1

• 2

• 3