The Layers in a Particular Gumball Are (1) an Outer

question 143

Multiple Choice

The layers in a particular gumball are (1) an outer layer of citric acid and malonic acid; (2) a layer of sugar and flavoring; (3) a layer of sodium bicarbonate (NaHCO₃) ; and (4) gum.When a person starts to eat one of these gumballs, s/he puckers, smiles, and then foams at the mouth before starting to chew the gum itself.Where did the foam come from?

• A)The sodium bicarbonate reacts with sugar, making carbon dioxide gas.
• B)The sodium bicarbonate explodes when exposed to moisture.
• C)The acids react with the sodium bicarbonate, making unstable carbonic acid.
• D)The flavoring contains a foaming agent.
• E)The acids react with the sugar, making a carbon volcano.

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