Dye Pigment

Inks can be separated by the method of ________.

• distillation

• filtration

• chromatography

• sedimentation

Chromatography separates mixture of dyes on the basis of their _________.

• density

• polarity (solubility)

• gravity

• boiling point

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.

The diagram shows the chromatogram for three different colored dyes and that for a brown marker. What dye(s) are contained in the marker's ink?

• purple and green

• purple and yellow

• purple only

• green and yellow

Based on the chromatogram, which ink is a mixture of different pigments?

• red

• orange

• green

• black

A pure substance will have ____ spot(s) on a chromatogram

• 0

• 1

• 2

• 3

This chromatogram shows five commercial dyes (X, P, Q, R and S). The pigment in dye Q Is known to cause cancer. Which dye(s) is/are safe for use?

• P only

• S only

• P and S

• P and X

Tags

NGSS.HS-ETS1-3

NGSS.HS-PS1-2

Why must the origin line on a chromatogram 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 colored

In paper chromatography, the stationary phase is the ____.

• paper you put your ink or pigment sample spots on

• solvent placed in the container

• ink or pigment sample you spot on your paper

• pencil used to mark the origin

In paper chromatography, the solute that is most soluble in the mobile phase (the solvent ) _____.

• 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