|Setting up the burets.|
I prepared two burets for the demo, one with water (with a little blue food coloring to make it easy to see) and the other with heptane. I borrowed a plastic stick and piece of rabbit fur from the physics closet to generate a negatively charged object.
When I passed the negatively charged stick by the stream of water, it bent toward the stick. The challenge was to get the water to bend enough to hit another beaker.
|Notice the cat fur and plastic stick, and the water stream bending.|
|A student hits the second beaker!|
|Heptane does not respond to the charged stick.|
|Here the heptane stream is not bending, just as I expected.|
|What?! This is not supposed to happen! The heptane bent toward the stick.|
|Another look at the heptane doing what it's not supposed to.|
|Here's some food coloring in the heptane, it doesn't dissolve|
|The iodine only dissolves in the heptane, turning it pink.|
|Watching the heptane "bubble" float back to the top.|
|The final look at the polar and non-polar solvents.|