For an explosive fountain of Halloween fun, try this carbonated chemical reaction!
-a two liter bottle of Diet Coke
-a roll of Mentos mints
-a piece of paper.
-a disposable plastic table cloth or some construction paper
1. Make a Halloween costume for your Diet Coke bottle. We made pumpkins by cutting up a plastic tablecloth into sections and cutting a hole on the fold for the mouth of the bottle. Then, we draped the “costume” over the bottle and decorated it with permanent marker.
2.Remove the lid from the bottle and set the Diet Coke on a flat surface (outside!)
3. Roll some paper so it will fit into the mouth of the bottle, tape it into a tube, and fill it with a roll of Mentos mints.
4. Quickly dump the mints into the bottle and stand back! (Young kids should wear safety goggles or sunglasses to protect their eyes.)
The science behind the fun: Scientists are not sure exactly why the Mentos cause such an explosive reaction, but they think it has to do with the chemical reaction that occurs between the Diet Coke and the Mentos mints, when chemicals in the Mentos break the surface tension in the soda at the same time that carbon dioxide (CO2) bubbles form very rapidly on the surface of the mints, causing a huge, very fast release of carbon dioxide bubbles. The pressure of this gas builds very quickly in the bottle, shooting the liquid and bubbles into the air.