This is a project that Talker Man actually found while browsing around on YouTube. I can't find the exact location, but if/when I do, I'll be sure to link it up!!
To do this experiment, you'll need the following:
1 cup of baking soda
1/4 cup of water
Small toys or whatever you want to "hide" in the snowballs. (My kids made Lego creations to hide.)
I totally didn't take pictures of the beginning stages because I was trying to help the baking soda stay in the bowl, BUT, simply take a cup of baking soda, pour it into a large bowl and add the 1/4 cup of water. Have your little ones use their hands to mix it together! It should be dough-ish, not too wet! If you put too much water in, just add more baking soda, or if you think it's too dry, add more water. Not too difficult, you can't mess it up.
packed a layer of the baking soda mixture into the bottom of muffin tins. The kids put a
toy on top of that layer of baking soda mixture and then packed more of the mixture on top of the toy. (Essentially, we buried the toy firmly with more baking soda mixture, similar to how you would pack a snowball.)
Put your muffin tin of hidden toys in the oven
at like 170 degrees (mine just says "warm" at that level) and bake them
for an hour to dry out the water. Please, make sure your oven isn't hotter than that, you don't want melted toys to be unveiled -- you'd have some upset kids!
When the hour is up and you've given the snowballs a little time to cool, you drop the baking soda ball into a bowl of vinegar and you have your toy again after the big foam
show! It's a great twist on the volcano experiment and my kids really enjoyed it!