If you shake the can then it wont only fizz and sizzle but explode because the citric acid will make the bubbles with the other ingredients will make CO2 and the solution will have no where to go but...
Mentos fizz because of the nucleation sites on the surface of the Mentos. These are basically microscopic holes and when it comes into contact with the coke all of the dissolved carbon dioxide...
The surface of the metos dissolves as the carbon dioxide (CO2) breakes it down, the eating up of the coating of the mentos forms a fizz that is visible to us.
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