Polar vs Nonpolar- Tie-Dye Index Cards (Mary Eckel)
Author
Mary Eckel
Principle(s) Illustrated
Polar and nonpolar substances will not mix
Hydrophilic substances contain polar molecules, which experience dipole forces of attraction.
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