Here's something I haven't been blogging about because I am essentially doing the Kid's Chemistry class that is in the sidebar. At any rate, I recently completed another round with a fresh group of kids!
But I wanted something for the portfolio, so here are some pictures from the last class, Acids and Bases.
Here the kids are pH testing a dozen or so household substances.
I was using it too explain the concept of limiting reagents: the volcano reacts until it runs out of it's limiting reagent (in this case acid), but you can add more until it stops reacting to fresh vinegar. That means base has become the limiting reagent, so you can add more baking soda.
Vinegar is cheaper than curiosity!
The whole class is blogged here.