Hydrophobic- Cells and Material (Casey Hayes)

Author

Casey Hayes

Principle(s) Illustrated

• Hydrophobic materials are produced on a large scale for consumers and commercial application.

• Biotic factors of the ecosphere are also included in the widespread use of hydrophobic substances and in fact, the origin of ideas for their use for the developed world.

• cells and other physiological processes follow these rules.

Standards

• Building models

• Crosscutting Concept: Interdependence of science, engineering, and technology

Questioning Script

Prior knowledge & experience:

Students know that sand is typically mixes in with water. Students are prompted to make observations about the two types of sand.

Students will observe demonstration on magic sand.

Students will make predictions on why sand behaves the way that it does.

Students will come up with a model that best describes it in terms of the way that hydrophobic material behaves in nature.

Lead students towards things in nature the repel water, and moisture, and explain how it might relater to the activity.

Students will talk about cells and how the resemble the lipid bilayer

Root question:

Why is this not normal sand?

How do hydrophobic substances work?

How is it used in other applications?

Target response:

The target response is that students come up with some form of example relating to the phospholipids, or the the class has some sort of thought process that need to look at water repelling material

Common Misconceptions:

A common misconception is that the water is juts not sticking to the material or that it isn't sand. They sometimes think that it is special water or liquid and the sand is just painted.

Photographs and Movies

References

magic sand from amazon