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Lecture 8.28.09 - Friday August 28 W h i c h o f t h e f o...

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Friday, August 28 CHEM 1251, Fall 2009 1 Which of the following represents the contents of the hydrogen-filled balloon from Monday’s demonstration ? 2 Which of the following represents the contents of the hydrogen-filled balloon from Monday’s demonstration ? Answer: B. 3 Which of the following represents a pure compound ? A. B. C. D. Both A and C E. None of these 4 Which of the following represents a pure compound ? Answer: D A. B. C. D. Both A and C E. None of these 5 Consider the molecular-scale views below. Which statement is incorrect ? A. I and II represent elements. B. II and III represent molecules. C. I, II, and III represent substances. D. IV represents a mixture. E. II and III represent compounds. I II III IV 6 Consider the molecular-scale views below. Which statement is incorrect ? A. I and II represent elements. B. II and III represent molecules. C. I, II, and III represent substances. D. IV represents a mixture. E. II and III represent compounds.
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