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The Coke and Mentos experiment is a physical reaction and not a chemical one because the chemical compounds involved are not changed. No "chemistry" happens, but only "physics" occurs. Let's look. Carbon dioxide (CO2) gas is dissolved in the Coke, and when the cap is removed, it begins to come out of solution and form bubbles. There is a complex issue regarding exactly where a bubble will form and how it will grow, but bubbles do form and grow. Dump in some Mentos and the surface of each of the Mentos provides a "zillion" sites for bubbles to form. They form quickly, then detach, and more bubbles quickly form. This results in a cascade of bubble formation and the dramatic result we see. And it's all about the CO2 coming out of solution and making bubbles rapidly. Those bubbles carry Coke with them to the top of the bottle as they make their way out, and we see the fountain form. The Mentos and Coke are unchanged, just as the CO2 is unchanged in this physicalreaction.
The reaction of Diet Coke and Mentos is a physical reaction. Links can be found below to learn more.

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Vanessa Nader

Lvl 10
2y ago

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