Rf Values and Chromatography

Ink can be separated by ____________________ .

• distillation

• filtration

• chromatography

• sedimentation

The chromatogram shows that the -------------- spot is a mixture.

• red

• orange

• green

• black

A pure substance shows ------------------ spot on chromatogram.

• no

• one

• two

• three

The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?

• P only

• S only

• P and S

• P and X

  A sample containing three different amino acids was separated by chromatography. How many spots will the chromatogram of this experiment have on it?

• 3
• 4
• 2
• 1

Which ink is the only one that is a mixture?

• red
• orange
• green
• black

What can be done if the unknown sample does not move during chromatography?

• Give up on science and become an English teacher.

• Try at a higher temperature.

• Let it go longer.

• Try a different solvent.

A substance is soluble if it can be dissolved.

In paper chromatography, the most soluble solute _____________________ .

• does not move from the start point

• stays closest to the start point

• travels furthest away from the start point

• can be found in the middle of the chromatogram

The mobile phase in paper chromatography is typically a ________ .

• plasma

• solid

• gas

• liquid

Why is Chromatography useful?

• It can be used as medicine.

• It can be used for finding clues at a crime scene

• It can be used to make bombs.

• It can reduce the lack of food and water.

Tags

NGSS.HS-ETS1-3