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Category: Back To School Special!
Posted on: September 2, 2010 12:18 PM, by Greg Laden
If you teach biology, you probably get to hydrogen bonding pretty early in the term. Here's an inspirational video for you:
hat tip: Bora
Hydrogen bonding explains everything!!!!
Why does water hold so much heat? Why does ice float? How does a water bug not sink? Why does a dog smell everyone's butt?
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Comments
Eh, I guess it was a good explanation for biologists.
The part that really annoyed me was the hydrogen bonding between two waters, since you will not form two hydrogen-bonds between the same two molecules of water (as opposed to acetic acid, which was a much better picture).
Also, they didn't talk about my favorite use for hydrogen bonding: bed-head. When you lay on your hair funny at night, it creates all sorts of hydrogen bonds on the strand of hair that kink your hair. Wetting your hair in the shower causes water to break those hydrogen bonds (by forming new ones with the water). That's clearly more important than water freezing or boiling.
Posted by: andre3 | September 2, 2010 5:50 PM
I personally like this one.
http://www.youtube.com/watch?v=t5ZFoU0S5iE
Posted by: Robert B | September 2, 2010 10:10 PM
"hydrogenbondingdidit"? Isn't that a hydrogenbonding-of-the-gaps argument? Why don't we just say goddidit - it's easier to spell.
Posted by: MadScientist | September 3, 2010 7:48 AM
A real easy way to show hydrogen bonding is by demonstrating surface tension with water. See how many drops of water can be placed ontop of a quarter before the water spills over the sides. Then do the same thing counting how many drops of rubbing alcohol can be placed ontop of the quarter. Have students notice the shape of the water ontop of the quarter versus the shape of the alcohol on the quarter. Why does water form a round drop? Why can so many drops of water fit on the quarter before it spills over? The strong attractive forces of hydrogen bonding of course.
Posted by: Mo | September 8, 2010 10:23 PM
Then you can lick off the alcohol.
Posted by: Phil | September 8, 2010 11:17 PM