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SC112 – 12-week Common Exam Name:_____________________________ Alpha:____________ United States Naval Academy Chemistry Department SC112: Foundations of Chemistry 12-Week Examination Spring 2008 Instructions 1. DO NOT open this exam until told to do so. 2. On the top of this page , write your name and alpha number. Do not remove the cover page from the rest of the exam. 3. On the scantron sheet , write your name, section number, instructor's name, and alpha number. Also, bubble in your alpha number. 4. There are 6 pages to this exam (including this cover sheet). The exam contains 25 multiple choice questions. Select the best answer and record it on the exam and on the scantron sheet. There is no penalty for guessing. You will be allowed a maximum of 50 minutes to complete this exam. 5. Periodic Table, constants, and equations are on the last page of this exam and may be separated from the remainder of the exam. 6. Read the following statement: This exam will be given to all SC112 students over the period 25 March to 26 March. In order to ensure a fair exam and be consistent with the USNA policies concerning graded academic work, you are not allowed to discuss any aspect of this exam (format, length, content, etc.) until 1 April .
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1. What is a Brönsted-Lowry acid? a. H + donor b. H + acceptor c. e donor d. OH donor 2. The pH of a 0.100 M solution of HClO is 4.26. What is the K a value for this acid? a. 3.0 x 10 –8 b. 1.2 x 10 –7 c. 5.5 x 10 –5 d. 1.1 x 10 –3 3. Which of these is NOT a conjugate acid- base pair for the stepwise dissociation of aqueous H 3 PO 4 ? a. HPO 4 2– and PO 4 3– b. H 3 PO 4 and H 2 PO 4 c. H 2 PO 4 and HPO 4 2– d. H 2 PO 4 and PO 4 3– 4. The K a of hydrocyanic acid, HCN, is 4.0 × 10 10 at 25 ο C. What is the K b for cyanide ion, CN , at 25 ο C?
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This test prep was uploaded on 04/07/2008 for the course CHEM 101 taught by Professor Schroeder during the Fall '08 term at Naval Academy.

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