sp08ex2 - CHEM 25 April 2 2008 Exam 2 Name User ID Please...

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CHEM 25 April 2, 2008 Exam 2 Name _______________________ User ID _______________________ Please check the studio to which you are assigned: _____ Mon PM _____ Tues AM _____ Tues PM _____ Thurs AM _____ Thurs PM Question Points Score 1 33 2 10 3 10 4 14 5 11 6 12 7 10 Total 100 INSTRUCTIONS: 1. You must show your work to receive credit. 2. Use the correct number of significant figures in answers to all questions on the exam. 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. There are a total of 7 problems on 8 pages. Pages 9 and 10 include a periodic table and useful equations and physical constants. Count the pages before you begin .
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2 Multiple Choice (3 pts.) 1. Clearly circle the BEST answer for each of the following questions. A. Diethylether (CH 3 CH 2 OCH 2 CH 3 ) was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the density in g/L of diethyether at 27 o C and 1.11 atm? a.) 37.1 g/L b.) 2.03 x 10 3 g/L c.) 2.71 g/L d.) 3.34 g/L e.) 0.299 g/L B. The principle that is based on electrons attempting to be as far apart as possible is: a.) Heisenberg Uncertainty Principle b.) Pauli Exclusion Principle c.) Hund’s Rule d.) Bohr Theory e.) none of these C. Which of the following statements is incorrect? a.) deBroglie proposed that both matter and energy have wave and particle properties. b.) The energy of matter is not continuous and is actually quantized. c.) Electromagnetic radiation can be thought of as a stream of particles called photons. d.) The wavelength of light emitted when a hydrogen electron makes a transition from n = 4 to n = 2 is shorter than the wavelength of light emitted when the same electron makes a transition from n = 2 to n = 1.
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