Physical Science

Chromatography

Content Objectives:
Students will be able to:

1.  Know the dyes are combinations of pigments.

2.  Pigments in dyes can be separated using physical techniques.

Process Objectives:

Students will be able to:

Observe simple separation of dyes due to different solubilities in the liquid.

Assessment Strategies:

Complete data chart:

Questioning:

Is the color you see on the tip of marker its real color?

At the conclusion of the activity, was your guess correct?

Procedures:

1.   Cut filter paper into thin strips (1cm x
6cm).

2.   Use a colored marker to make a dot in the middle of the strip of paper.

3.   Place the filter paper in the jar of water so that the tip touches the water.

Fold top over to hold in place. Wait for the water to rise through the paper and penetrate the dot. Record your observations in the chart.

Lesson extension:

How might this process be helpful in a forgery investigation?

Put two different colored dots side by side.

Repeat this with different liquids: water, rubbing alcohol, water/alcohol mix, acetone (nail polish remover).

Suggested Level:
Grades K-3

Standard Category:
3.4  Physical Science, Chemistry and Physics

Materials:
For each child:

Strips of filter paper (coffee filters)

Markers

Jar (baby food)

Water

Instructional Strategies:
Use of manipulates

Individual instruction