177Exam2KeyS08

177Exam2KeyS08 - Seat #_ Dr. Joe Burnett Spring 2008 This...

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Seat #__________ Dr. Joe Burnett Spring 2008 This exam consists of 14 questions on 7 pages CHEM 177 Exam II March 3, 2008 Name______________________ Recitation TA ______________ Recitation Section ___________ Grading Teaching Assistants and Recitation Sections Page Points Score Name Sections Time 2 3 4 5 6 TOTAL 28 pts 28 pts 16 pts 16 pts 14 pts 102 pts ________ ________ ________ ________ ________ David Ackerman Tanya Gupta Kristopher McKee Nicholgas Nagle Ying Xia 2, 3 5, 7 6, 9 8, 10 4, 11 8:00, 9:00 10:00, 11:00 11:00, 12:10 12:10, 1:10 9:00, 2:10 Questions are written on both sides of each page. Solubility Rules and a Periodic Table are 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 one 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. (4 pts) Consider the following reaction. Underline the species that is reduced and circle the species that is oxidized . Ni (s) + 2 HNO 3 (aq) !" ! Ni(NO 3 ) 2 (aq) + H 2 (g) 2. (4 pts) Determine the oxidation state of a single phosphorus atom in the pyrophosphate anion: P 2 O 7 4– . 2 x + 7 (– 2) = – 4 => x = +5 3. (10 pts) What is the volume in mL of a 0.25 M NaOH (aq) solution needed to neutralize 125 mL of 0.19 M H 3 PO 4 (aq) ? H 3 PO 4 (aq) + 3 NaOH (aq) !" ! 3 H 2 O ( l ) + Na 3 PO 4 (aq) For full credit, show all work, use units, report your answer to the correct number of significant figures. 125 mL 1 L 1000 mL 0.19 mol H 3 PO 4 1 L 3 mol NaOH 1 mol H 3 PO 4 1 L 0.25 mol NaOH 1000 mL 1 L = 2.8 × 10 2 mL (2 sig figs) 4. (6 pts) What is the mass amount in g of H 2 S in 3.00 L of a 0.365 M H 2 S (aq) solution? For full credit, show all work, use units, report your answer to the correct number of significant figures. Molar mass of H
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177Exam2KeyS08 - Seat #_ Dr. Joe Burnett Spring 2008 This...

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