The “co-” part means “together.” The “ad-” part means “to.” The last part of both words refers to the verb “stick” as in “sticky.” Word roots are helpful to keep from mixing up these terms. Water sticks to itself and also to lots of other stuff.
Scientists You Should Know
Dr. Isabel Rozas is a Medicinal Chemist who makes drugs against cancer, infection, and depression. She is especially interested in hydrogen bonds. Can we think about how they might work in the drug/body system?
Introduction to the topic
Experiencing the science
Try this…
Responding to the science
Multisensory
When I was in the tub, I used to spend a lot of time watching water droplets on the tips of my fingers. I would also put my fingertips together to make the droplets into a sort of bridge between the fingers. It seems to work better when I’ve been soaking a while. That’s something to think about. Is it true? Maybe test it.
When the faucet is dripping, it makes a sound. Can we change the sound? How?
Creative
Watercolor materials are specifically designed around their hydrophilicity (water loving-ness). We got this set from https://www.letsmakeart.com/. It’s probably available elsewhere. The paintbrush that comes with it is actually a watercolor brush. If you have a dollar store set, it will be fine, but the brush is likely made of some hydrophobic (water-fearing) material like nylon, so it won’t make very nice droplets or hold any water so you’ll have dip it back into paint constantly and scrape around on the paper. Try it out if you like. (P.S. Let’s Make Art has excellent tutorials for various art comfort levels and motor skills.)
To demonstrate cohesion and adhesion, check out how dry watercolor paper is hydrophobic, but wet watercolor paper is hydrophilic.
So, it makes some neat droplets.
Verbal/Analytical
Get a load of this journal article. Try looking at just the Figures (the pictures) and maybe read the abstract with help. See if you can figure out what’s going on with the graphs. It’s cool to think about how animals walk on smooth surfaces.
How is the frog sticking to the glass similar/different to the water striders? OR the Basilisk lizards?
https://www.nationalgeographic.com/animals/reptiles/facts/green-basilisk-lizard