My cooperating teacher was out today, so I subbed for her, and we had lots of fun in the science lab. The website where my cooperating teacher got these experiment ideas is http://www.sciencecafe.org/content/ All the chemistry is explained there too. This first one is titled "Turn Water into Wine" on that website. You have two whitish liquids, pour them back and forth for a minute or so, and all of a sudden, it turns black...
This one is called "Kid Safe Elephant's Toothpaste" on that website...we just did it inside a Jack-o-Lantern because it was Halloween. You mix high percentage H2O2 with dish detergent and a bit of yeast. Pictured below is what it looks like just before you dump the yeast in.
Here, I'm showing the students it is an exothermic reaction because the bubbles are hot.
And this is what it looks like when the reaction is over...
This next one is called, "Color Changing Potions." Using cabbage as an indicator, we saw the differences in pH. Check out the Halloween lights my cooperating teacher put up. This is just water heating up, but in a really cool flask :)