Explanation: The Diet Coke reacts to the Mentos because there are twofold on the Mentos that are tiny pits on the mints surface. Mentos themselves have thousands of these twofold on them that act as nucleation sites, which is what carbon dioxide is attracted to. When the Mentos meet the Diet Coke bubbles form all over the Mentos and quickly rise to the top of the Diet Coke bottle. This is what makes the Diet Coke explode