ExIV1SP05 - Chemistry 162SG Exam I February 11, 2005...

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Chemistry 162SG Exam I February 11, 2005 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 ) Y o u r E X A
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162SG E1V1 SPRING “05” 2 1. A concentration of 2.0 mg solute per 10.0 kg of solution is equivalent to A. 0.020 percent by mass B. 2.0 ppm C. 20 ppm D. 2.0 ppb E. 200 ppb 2. A 1.09 g sample of substance X is dissolved in 26.8 g of benzene. The freezing point of the solution is 3.76 ° C. The freezing point of pure benzene is 5.53 ° C. K f = 5.12 ° C kg/mol for benzene. What is the molar mass of X? A. 118 mol g B. 67.2 mol g C. 153 mol g D. 88.5 mol g E. 87.0 mol g 3. How many grams of naphthalene (C 10 H 8 , molar mass 128.2 g/mol) must be dissolved in 2.00 moles of benzene, C 6 H 6 , in order to lower the vapor pressure of benzene by 10.0%? A. 19.2 g B. 28.5 g C. 32.4 g D. 38.2 g E. 48.6 g
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162SG E1V1 SPRING “05” 3 4. Given the following data for a reaction between A and B: Initial Rate (M s -1 ) Initial Concentrations (M) [ A ] [ B ] 0.0030 0.040 0.030 0.0060 0.040
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This note was uploaded on 12/19/2008 for the course CHEM 162SG 162 taught by Professor Vassillian during the Spring '08 term at Rutgers.

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ExIV1SP05 - Chemistry 162SG Exam I February 11, 2005...

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