Chapter 12 - Chemistry 11e(Brown/LeMay/Brusten/Murphy...

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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 12: Modern Materials 12.1 Multiple Choice and Bimodal Questions 1) The class of semiconductors, known as elemental, has special features. These are __________. A) band gap and individual element valence electrons B) periodical table grouping and diamond crystal structure C) tetrahedral coordination geometry and sp 2 hybrid orbitals D) overlapping hybrid orbitals and filed conduction bands E) none of the above Answer: B Diff: 2 Page Ref: Sec. 12.3 2) How much CO 2 is released annually from a 500 MW coal-fired power plant? 3) Blue LEDs are usually made of _________.
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4) Of the following, only __________ is not a polymer. 5) Which one of the following is an addition polymer with the same structure as polyethylene except that one hydrogen on every other carbon is replaced by a benzene ring? A) polyvinyl chloride B) polypropylene C) polystyrene D) polyurethane E) nylon 6, 6 Answer: C Diff: 2 Page Ref: Sec. 12.6 6) A sample of natural rubber (200.0 g) is vulcanized, with the complete consumption of 4.8 g of sulfur. Natural rubber is a polymer of isoprene 5 8 (C H ) . Four sulfur atoms are used in each crosslink connection. What percent of the isoprene units will be crosslinked?
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7) Which of the following is not a natural polymer? 8) A category __________ plastic container will generally be the most easily recycled. 9) Which of the following is not a biopolymer? A) protein B) polysaccharide C) polyurethane D) RNA E) DNA Answer: C Diff: 2 Page Ref: Sec. 12.6
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Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 12: Modern Materials 10) A __________ liquid crystal has the least order and is the most liquid-like. 11) Which type of liquid crystal is colored and changes color with temperature?
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