Chem 177 Spring 2010 exam 2 answers

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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 + and is symbolized in the following equation as H 4 Y. For full credit, show all work, use units, and report your answer to the correct number of significant figures.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern