Today we conducted an experiment to investigate if the final product of mixing Mentos and Coke together would be a reversible or irreversible change.
We dropped the Mentos to the bottom of the bottle, which began forming lots and lots of bubbles. The liquid and solid both react and their states of matter change. It causes more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the liquid. When all of this gas is released it forces the liquid up and out of the bottle in a giant whooshing geyser of sticky coke. The kids loved it.