Water!

To begin the class, we took a quiz on basic chemistry. Then, we answered questions that dealt with our homework on white boards. When we came to a question about why water forms a convex shape when it slightly overflows. To study this concept, we did a small lab with pennies.

Penny Lab

1. We dropped droplets of water onto the penny until it was slightly overfilled.
2. We stabbed the convex "bubble" with a toothpick and observed that the water stuck to the needle as it was pulled out, but didnt overflow off of the penny.
3. Then, we dipped the toothpick in dishsoap and stuck it into the bubble.
4. This time, the bubble broke because the hydrogen bonds were broken by the dish soap and the water in turn overflowed.