This lab uses pipettes of isopropyl alcohol, water, and a penny to demonstrate the effects of water's extensive system of hydrogen bonding on surface tension and cohesion.
What students observe is that the droplets of water coming from the pipette of water are themselves larger than the droplets of alcohol. They also observe that the "bubble" of water on top of the penny is larger than the "bubble" of alcohol.
My labs are straightforward. Some of them are paper labs, but the ones that involve significant laboratory setup or calculations to be made on the part of the teacher are written about in a Teacher Notes section at the end of those particular labs. I use relatively safe and inexpensive chemicals. Of course, safety precautions are always noted at the beginning of the lab.
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Science Education by Joshua Wickline is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States License