The reaction between Diet Coke and Mentos is violent primarily due to Mentos candies’ surface and density, although there are other factors at work. Mentos candies have dimpled surfaces that encourage the growth of carbon dioxide bubbles by disrupting the bonds of water molecules when they are dropped into Diet Coke. The gum arabic in Mentos as well as the aspartame in Diet Coke also lower the surface tension of the Diet Coke, allowing for more bubbles to be created. Mentos is also a fairly dense candy, so when it drops to the bottom of the Diet Coke bottle, it produces bubbles rapidly. These bubbles can produce even more bubbles when they rush to the surface, creating a dramatic fountain of Diet Coke.
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