exam_1_sp07 - Chemistry 162SG Exam I February 9, 2007...

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162SG E1V1 SPRING “07” 1 Chemistry 162SG Exam I February 9, 2007 Student Name: _____________________ Recitation Section Number: ____ Recitation Instructor: _________________________ The exam has 25 questions for credit and an additional one to check the color of your exam booklet. Please answer all 26 questions on the OpScan sheet. There is no penalty for guessing. At the end of the 80-minute exam period, please hand in only this top sheet and your OpScan form. If you finish early, please do not disturb your fellow students. A proctor will check your picture-ID, OpScan form and signature during the exam. Exam scores and an exam curve will be posted as soon as possible. ON THE OpScan FORM: (Use a Number 2 Pencil or Darker) (1) SIGN your name across the TOP of the form. (2) code only the following information: [ blacken circles] (a) Your Name . . . LAST NAME FIRST [ blank space between last and first names ] (b) Your SOCIAL SECURITY NUMBER [Start under Box A and continue to Box I ] (c) Your RECITATION SECTION NUMBER (Boxes ) [Sections R1=51, R2=52, R3=53, R4 = 54 (d) Your EXAM FORM NUMBER (Box P ) Your EXAM FORM is: See last pages of exam for physical constants, periodic table, and other information.
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162SG E1V1 SPRING “07” 2 1. A sample of gaseous N 2 O 5 decomposes according to the following first-order reaction: 2N 2 O 5 (g) 4NO 2 (g) + O 2 (g) k = 3.5 x 10 -3 s -1 How long will it take for the concentration of N 2 O 5 to drop to 65.0% of its original value? A. 14 s B. 35 s C. 65 s D. 103 s E. 123 s 2. A 4.03 M aqueous solution of the antifreeze ethylene glycol (C 2 H 6 O 2 ) has a density of 1.045 g/cm 3 . What is the mass percent of ethylene glycol in this solution? (Molar mass of C 2 H 6 0 2 is 62.07 g/mol.) A. 23.9% B. 16.7% C. 76.0% D. 33.6% E. 5.9% 3. Which of the following statements would be correct regarding the following reaction? 2H 2 (g) + O 2 (g) 2H 2 O(g) A. The rate of O 2 disappearance is twice the rate of H 2 disappearance. B.
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exam_1_sp07 - Chemistry 162SG Exam I February 9, 2007...

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