Apple Volcano
Materials
apple
baking soda
dish soap
vinegar
dish to catch the run-off
Directions
Place your apple on your dish. Use a knife to cut a hole or vessel in the top of the apple about halfway down.
Put a couple of spoonfuls of baking soda into the hole
Add a drop of dish soap for a foamier eruption
Pour your vinegar into a separate container. Use an eye dropper or turkey baster to slowly add vinegar to the apple.
Watch the magic
What is happening?
A chemical reaction occurs between two or more substances that change and form a new substance, and in this case a gas called carbon dioxide. In this case, you have an acid (liquid: vinegar) and a base (solid: baking soda) when combined make a gas called carbon dioxide which produces the eruption you can see.
The carbon dioxide escapes the mixture in the form of bubbles. You can even hear them if you listen closely. The bubbles are heavier than air, so the carbon dioxide collects at the surface of the apple or overflows the apple because of the small vessel we have given it.
adapted from Little Bins for Little Hands