Exam 1-1.2 - D. midway between 14 and 15 amu E. slightly...

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EXAM I Sample Exam 1-1 Dr. V. Williamson © Vickie M. Williamson 2007, All Rights Reserved 1 1. What is the % by weight (mass percent) of Cl in CH 2 Cl 2 ? A. 16.5 B. 83.5 C. 41.8 D. 19.8 E. 94.1 2. Which of the following transitions in the Bohr hydrogen atom model gives an emission of the shortest wavelength? A. n i = 4 -> n f = 1 B. n i = 3 -> n f = 6 C. n i = 1 —> n f = 6 D. n i = 6 -> n f = 3 E. n i = 6 -> n f = 1 3. How many significant figures should there be in the answer to the following problem? (146.3 — 142.4)(2.35 x 10 8 ) 8.45 A. 2 B. 1 C. 3 D. 4 E. 5 4. Assume that naturally occurring Element Z is 90.634% Z-14, 9.300% Z-15 and 0.066% Z-13. Which of the following would you predict the atomic mass of Element Z to be? A. slightly below 14 B. exactly 14 amu C. 13 for Z-13, 14 for Z—14, and 15 for Z—15
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Unformatted text preview: D. midway between 14 and 15 amu E. slightly above 14 5. The radioactive isotope strontium-90, a component of fallout from atmospheric nuclear testing, is particularly hazardous because its 2+ ion may substitute for that of calcium in bone. 9O Sr 2+ has: A. 38 protons, 52 neutrons, and 36 electrons B. 38 protons, 52 neutrons, and 40 electrons C. 52 protons, 38 neutrons, and 50 electrons D. 52 protons, 38 neutrons, and 54 electrons E. 38 protons, 52 neutrons, and 38 electrons 6. How many moles are in 490 grams of H 2 S0 4 ? A. 0.20 mol B. 3.0 e26 mol C. 5.0 mol D. 2.0 mol E. 0.50 mol 7. Which one of the following elements has the lowest first ionization energy? A.K B.Sr C.Na D.Ca E.Rb...
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