Exam1BKey - Chemistry 142D Multiple Choice Exam (a) Before...

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Chemistry 142D Multiple Choice Exam (a) Before starting, make sure your exam has 6 pages, including the periodic table. (b) To receive credit you must be sitting in your assigned seat or discuss a move with your TA. (b) Fill in your name, section, and student number on Side 1 of the Answer Sheet . (c) To receive credit, you must mark Test Version B on Side 1 of the answer sheet. (d) When you are done with the exam, hand the Answer Sheet to a TA. (e) The exam is over at 6:20 PM. No answer sheet will be accepted after 6:20 AM. (e) Our final exam is scheduled for MONDAY, DECEMBER 14 at 6:30 PM in this room. (f) Avogadro’s number is 23 6.022 10 A N ±
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CHEM 142D First Midterm 2009 October 25 Page 2 You must mark version B on side 1 of the Answer Sheet. 1. (3 points) The result of ( 4.8213 / 0.650 ) is properly written as a. 7.4 b. 7.41 c. 7.42 d. 7.4174 e. 7.4173846 2. (8 points) When 3.0 L of hydrogen gas (H 2 ) reacts with 1.0 L of nitrogen gas (N 2 ), 2.0 L of gaseous product are formed. All volumes of gases are measured at the same temperature and pressure. What is the formula of the product? a. N 2 H 6 b. NH 4 c. NH 3 d. N 2 H 3 e. NH 3. (6 points) The transition metal rhenium has two stable isotopes. The atomic mass of rhenium is 186.2 g/mol. Given that 37.1% of natural rhenium is , what is the other stable isotope?
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This note was uploaded on 11/02/2011 for the course CHEM 142 taught by Professor Zoller,williamh during the Fall '07 term at University of Washington.

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Exam1BKey - Chemistry 142D Multiple Choice Exam (a) Before...

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