177Exam2KeyS06

177Exam2KeyS06 - SEAT NO DR JOE BURNETT SPRING 2006 THIS EXAM CONSISTS OF 11 QUESTIONS ON 8 PAGES CHEM 177 EXAM II MARCH 1 2006 NAME RECIT INSTR

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SEAT NO.__________ DR. JOE BURNETT SPRING 2006 THIS EXAM CONSISTS OF 11 QUESTIONS ON 8 PAGES CHEM 177 EXAM II MARCH 1, 2006 NAME______________________ RECIT. INSTR.______________ RECIT. SECT._______________ GRADING Teaching Assistants and Recitation Sections PAGE POINTS SCORE Name Sections Time 2 3 4 5 6 7 TOTAL 14 pts 16 pts 22 pts 20 pts 20 pts 8 pts 100 pts ________ ________ ________ ________ ________ ________ ________ Bose, Sayantan Delaney, Liz Deo, Archana Jadin, Tamela Jing, Dapeng Schiltz, Holly 9, 11 4, 6 3, 5 10 7, 8 2 12:10, 2:20 9:00, 11:00 9:00, 10:00 1:10 11:00, 12:10 8:00 QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THERE IS A PERIODIC TABLE ON THE LAST PAGE. YOU MAY REMOVE THIS PAGE FOR SCRATCH PAPER. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #5 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 177 WEBSITE. SHOW ALL WORK. ANSWERS SHOULD INCLUDE APPROPRIATE UNITS AND CONTAIN THE CORRECT NUMBER OF SIGNIFICANT FIGURES. Answer Key
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2 1. Use the figures below to answer the following questions. Each box represents an aqueous solution. The water molecules are not shown for clarity. You may use the same answer more than once. i ii iii iv v A. (2 pts) Which box best illustrates a strong acid? i B. (2 pts) Which box best illustrates a weak acid? iv C. (2 pts) Which box best illustrates a nonelectrolyte? iii D. (2 pts) Which solution would be most conductive of electricity? iv E. (2 pts) True or False: QX is a molecular compound. False 2. Determine the oxidation state of the indicated element in the following species. A. (1 pt) Cr in Cr 2 O 7 –2 2 x + 7 (–2) = –2 => x = + 6 B. (1 pt) H in NaH – 1 C. (1 pt) C in C 2 H 4 O 2 x + 4 (+1) – 2 = 0 => x = – 1 D. (1 pt) Fe in Fe 2 O 3 2 x + 3 (–2) = 0 => x = + 3 H 3 O + H 3 O + X X Q + Q + X X ZG 2 ZG 2 ZG 2 ZG 2 ZG 2 HW HW HW H 3 O + W W H 3 O + HW HW W H 3 O + OH BH + B B B B B
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3 3. (10 pts) The following reaction is used to prepare iron (Fe) from iron ore: Fe 2 O 3 (s) + 3 CO (g) 2 Fe (s) + 3 CO 2 (g) The source of the CO is the incomplete combustion of pure carbon (coke). In an experimental method, 155 g of Fe 2 O 3 was reacted with 275 g of CO. 66.2 g of Fe was produced. What is the % yield? For
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This note was uploaded on 03/26/2008 for the course CHEM 177 taught by Professor Greenbowe during the Spring '06 term at Iowa State.

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177Exam2KeyS06 - SEAT NO DR JOE BURNETT SPRING 2006 THIS EXAM CONSISTS OF 11 QUESTIONS ON 8 PAGES CHEM 177 EXAM II MARCH 1 2006 NAME RECIT INSTR

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