Another fun experiment that we do is to address density. This topic relates back to the idea of sink and float. If an object is denser than water it floats, less dense it sinks. In this experiment, we have a glass of water and a glass of alcohol side by side. We ask the students if ice floats or sinks. They will answer float and we will drop and ice cube in each glass. Surprisingly for the students, the ice cube floats in the alcohol. They will be shocked. Now ask them what happened. Teach them how to gently smell the contents of the glass by waving their hand over the glass toward their nose. They should recognize the smell of the alcohol from the doctor's office. Explain how ice is more dense than alcohol. Next, they can use a water dropper to add water to the alcohol jar to let the ice cube rise and the density of the liquid changes with the addition of water.
These are all fun. We do one more experiment, but because I did not have an assistant today I could not photograph it. In the last station, we have a tub, a large cup of water and a string. I ask the students what happens if I pour the water out of the cup, where does it go? Then I take a wet string and run it from the cup to the tub and pour out the water again. This time, the water follows the string. Next, have the students pick out a string and then pour the water. The string they pick out will be dry and of course the water will not flow down the string. They will be surprised it doesn't work. Then wet the string and show them how the water molecules attract each other through cohesion, which is why this experiment works!
Hopefully, I will be able to take some photos of the kids performing some of these experiments. I am just usually too busy working with the kids to take photos.