Now this is what I love about homeschooling - watching what can happen with unlimited time to just live and play and be curious about whatever takes your fancy :) This boy of mine would happily spend the entire day doing one science experiment after another - and often does just that! He doesn't read yet, but that doesn't stop him when I'm not available - he figures it all out from the pictures ;)
It's a good thing that baking soda and vinegar are cheap ;)
Setting up a chain reaction here...fun :)
This one is so simple and fun. Just cut a circle out of paper and then cut in a spiral. Attach a string at the top and hold it over a light bulb and watch it spiral around from the heat.