Polar vs Nonpolar- Tie-Dye Index Cards (Mary Eckel)

Author

Mary Eckel

Principle(s) Illustrated

1. Polar and nonpolar substances will not mix

2. Hydrophilic substances contain polar molecules, which experience dipole forces of attraction.

3. Hydrophobic substances contain nonpolar molecules

Standards

• 2. Biological, chemical, and physical properties of matter result from the ability of atoms to form bonds from electrostatic forces between electrons and protons and between atoms and molecules.

Questioning Script

Prior knowledge & experience:

Like dissolves like.

Definitions of polar and nonpolar

Root question:

What do you think will happen when the index card is removed from the shaving cream and food coloring mixture?

Target response:

The food coloring will "stick" to the card and the shaving cream will wipe off because of the polarity.

Common Misconceptions:

The index card will be "soggy" because of the shaving cream

The food coloring will rub off of the index card

Photographs and Movies

References

Polar vs, Nonpolar

Saturday Science: Tie Dye Paper