Leaf Chromatography Lesson

Chromatography separates a mixture of dyes on the basis of their _______.

• density

• solubility

• gravity

• boiling point

On the chromatogram given, ________ dye is a mixture.

• red

• orange

• green

• black

A pure substance shows _____ spot on the chromatogram.

• 0

• 1

• 2

• 3

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

Tags

NGSS.MS-PS1-3

Dyes in water soluble markers may be separated by means of ________.

• crystallization

• sublimation

• chromatography

• sedimentation

Which plant species has plant pigments most similar to those in A?

• B
• C
• D

What is chromatography?

• A way to see pretty colors

• A laboratory technique used to separate a mixture.

• A form of distillation

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.MS-PS1-2

Why must the base line be drawn in pencil and not pen?

• a) Pencil is good at keeping substances in place.
• b) Pencil is soluble in water
• c) Pencil is insoluble in water
• d) Pencil is not coloured

If a substance is not soluble in the solvent, what happens to the spot placed on the start line?

• a) Dot moves to the top of the paper

• b) Dot does not move at all

• c) Dot moves to the left or right

• d) Dot moves down to the bottom of the paper