Chem 177 Spring 2010 exam 2 answers

Chem 177 Spring 2010 exam 2 answers - Dr. Joe Burnett...

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Dr. Joe Burnett Spring 2010 This exam consists of 13 questions on 9 pages Chem 177 Exam II March 3, 2010 Name______________________ Recitation TA ______________ Recitation Section ___________ Grading Teaching Assistants and Recitation Sections Page Points Score Name Sections Time 2 3 4 5 6 7 TOTAL 24 pts 14 pts 24 pts 14 pts 16 pts 12 pts 104 pts ________ ________ ________ ________ ________ ________ Stacey Althaus Kyle Marchuk Kristopher McKee Justin Smith Anthony Stender Nishad Thamban Chandrika Songchen Xu 5 1, 10 11, 12 8 2, 3 4, 6 7, 9 10:00 8:00, 1:10 2:10, 1:10 12:10 8:00, 9:00 9:00, 11:00 11:00, 12:10 Questions are written on both sides of each page. There is a periodic table and an equation on the last page. You may remove this page for scratch paper. Show all work. Answers should include appropriate units and contain the correct number of significant figures. The last day to drop Chem 177 and add Chem 50 is Thursday, March 4, at 4:00 PM. See your advisor to obtain the drop/add form and go to the General Chemistry Office, room 1608 Gilman Hall. Answer Key
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2 1. (2 pts) Which of the following is a strong electrolyte? a) HCl (aq) b) H 2 O c) acetic acid d) ammonia e) all of the above are strong electrolytes 2. (6 pts) Consider an aqueous solution of acetic acid, write the formulas of all species expected to be present (other than H 2 O). Circle the substance present at the highest concentration in the solution. C 2 H 3 O (aq) C 2 H 3 O 2 H (aq) H + (aq) or H 3 O + (aq) 3. (4 pts) What is the oxidation state of the sulfur atom in the metabisulfite ion S 2 O 5 2– ? 2 x + 5 (–2) = –2 2 x – 10 = –2 2 x = +8 x = +4 4. (4 pts) Write the reaction equation that represents what happens when ammonia NH 3 is dissolved in water. [Hint: what type of aqueous solution results from the dissolution of NH 3 ?] For full credit, indicate the phases of all reactants and products ( aq , l, s, g ). NH 3 (aq) + H 2 O (l) NH 4 OH (aq) or NH 3 (aq) + H 2 O (l) NH 4 + (aq) + OH (aq) 5. (8 pts) How many liters of 0.23 molar NaOH is needed to neutralize 2.63 liters of 0.49 molar EDTA. EDTA is a weak acid that can donate four protons H
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This note was uploaded on 09/09/2011 for the course CHEM 177 taught by Professor Greenbowe during the Spring '06 term at Iowa State.

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Chem 177 Spring 2010 exam 2 answers - Dr. Joe Burnett...

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