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e2-131-f11 - CHE 131 Exam 2 Fall 2011 Multiple Choice 4...

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CHE 131 Exam 2 Fall 2011 Multiple Choice, 4 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. BONUS. 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 (NaHCO 3 ), 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 carbon volcano. ____ 2. Which of the following ionic compounds is insoluble in water? A. BaCl 2 D. Ba(NO 3 ) 2 B. BaSO 4 E. MgCl 2 C. NaOH ____ 3. If the molar concentration of sodium sulfate (Na 2 SO 4 ) is 0.10 M , what is the concentration of sodium ion? ____ 4. Which of the following is unimportant when using the ideal gas law?
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