A Cross Section of a Mad-Dawg Gumball Shows an Outer

Multiple Choice

A cross section of a Mad-Dawg gumball shows an outer layer of citric acid and malonic acid, beneath that a layer of food coloring, sugar, and flavoring, beneath that a layer of sodium bicarbonate (NaHCO₃) , and finally in the middle-gum! A 12-year-old puts one in his mouth and immediately puckers, smiles, and then foams at the mouth before chewing. Where did the foam come from?

A) Twelve-year-olds naturally foam at the mouth.
B) The sodium bicarbonate explodes when exposed to moisture.
C) The acids react with the sodium bicarbonate, making unstable carbonic acid.
D) The foam must have been packed in the gum somewhere.
E) The acids react with the sugar, making a carbon volcano.