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Chemical Reaction Of Mentos

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The scope of this paper is to explain the reaction that takes place when Mentos are dropped into Diet Coke. This experiment is used frequently because of what happens when the candy meets the soda. A geyser is formed that shoots out of the bottle that resembles a volcanic eruption. Due to the similarity, it is also used for volcano projects. Depending on the alterations to the Mentos and/or Diet Coke, the geyser can either go much higher or much lower than normal.
This reaction has produced much confusion among people about whether it is a physical or chemical reaction. It is a physical reaction because the substances remained the same, the reaction did not form a new substance. (Coffey) What creates the physical reaction is water molecules that go into the pores on the Mentos. The rough surface of Mentos allow this to happen. The water molecules grow to create carbon dioxide bubbles on the outside of the candy. The Mentos gain buoyancy, which means they rise to the surface of the soda. After this occurs, there is increased bubble formation, resulting in the liquid turning to foam and shooting out of the bottle. Bubble formation is also increased by the gum arabic and gelatin in the Mentos combining with the potassium benzoate, sugar, and aspartame in the Diet Coke. (Hiskey, Mental Floss)
As stated above, there are alterations that speed the reaction. These include decreasing the surface tension of the Diet Coke, performing an acid-base reaction, and warming the Diet Coke.

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