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In this chemistry activity, learners use thin layer chromatography to determine the molecular composition of different markers.

In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

In this activity related to the human circulatory system (on page 10 of the PDF), learners observe the dispersion of a drop of food coloring in water, draw conclusions about the movement of dissolved

Learners use filter paper and water to analyze six different markers. They mark the paper with ink, and dip the paper in water. The water travels up the paper and dissolved ink travels with it.