Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 21: Nuclear Chemistry
21.1 Multiple-Choice and Bimodal Questions 1) What percentage of electricity generated in the U.S. is from commercial nuclear plants? A) 1% B) 10% C) 20% D) 50% E) 90% Answer: C Diff: 1 Page Ref: Ch. 21 Intro. 2) By what process does thorium-230 decay to radium-226? A) gamma emission B) alpha emission C) beta emission D) electron capture E) positron emission Answer: B Diff: 1 Page Ref: Sec. 21.1 3) The alpha decay of what isotope of what element produces lead-206? A) polonium-210 Answer: A Diff: 2 Page Ref: Sec. 21.1 Chemistry, 11e (Brown/LeMay/Brusten/Murphy) Chapter 21: Nuclear Chemistry 4) In balancing the nuclear reaction 238 234 4 U E He 92 90 2 ﾮ + , the identity of element E is __________. A) Pu B) Np C) U D) Pa E) Th Answer: E Diff: 2 Page Ref: Sec. 21.1 5) This reaction is an example of __________. 210 206 Po Pb _____ 84 82 ﾮ + A) alpha decay B) beta emission C) gamma emission D) positron emission E) electron capture Answer: A Diff: 1 Page Ref: Sec. 21
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