Exam I - F08 KEY

Exam I - F08 KEY - Name_ Student ID Number_ Lab TA Name and...

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Name______________________________________ Student ID Number___________________________ Lab TA Name and Time_______________________ Fall 2008 - Enderle CHEMISTRY 2A Exam I Multiple Choice (circle one) Instructions: CLOSED BOOK EXAM ! No books, notes, or additional scrap paper are permitted. All information required is contained on the exam. Place all work in the space provided. If you require additional space, use the back of the exam. (1) Read each question carefully. (2) There is no partial credit for the problems in Part I and Part II. (3) The last page contains a periodic table and some useful information. You may remove this for easy access. (4) Graded exams will be returned in the discussion sections next week. (5) If you finish early, RECHECK YOUR ANSWERS! U.C. Davis is an Honor Institution Possible Points Points 1–16. 48 points 17–18. 12 points 19–20. 11 points 21–22. 12 points 23. 12 points 24. 6 points 25. 8 points Total Score (109) 1. A B C D E 2. A B C D E 3. A B C D E 4. A B C D E 5. A B C D E 6. A B C D E 7. A B C D E 8. A B C D E 9. A B C D E 10. A B C D E 11. A B C D E 12. A B C D E 13. A B C D E 14. A B C D E 15. A B C D E 16. A B C D E
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Page 2 of 11 Part I: Multiple Choice, Concepts Circle the correct answer here and on the cover – No partial credit (3 points each) 1. Which of the following numbers has two significant figures? A. 30 B. 05 C. 60.0 D. 1.0 x 10 2 E. 75.2 2. A percent yield less than 100.0% might indicate … A. Experimenter error B. The law of conservation of mass was broken C. A side reaction had occurred D. Both A and C are possible E. Both A and B are possible 3. [ Suggested HW 2.43 ] The 3 naturally occurring isotopes of potassium are K-39, 38.963707 u; K-40, 39.963999 u; and K-41. The natural abundances of K-39 and K-41 are 93.2581% and 6.7302%, respectively. Determine the isotopic mass of K-41. (Atomic mass of K = 39.0983 u) A. 0.0117 B. 40.962 C. 0.00468 D. 36.3368 E. 39.0983 4. Which of the following elements has 17 electrons? A. 35 Ar B. 32 S - C. 39 K + D. 34 Cl - E. 35 Cl + 5. Which of the following is a halogen? A. Na B. Cl C. S D. P E. Si 6. The unit of mole would be most useful for a numerical unit of measurement in which of the following non-chemistry areas? A. Money in your bank account B. Population of a country C. Stars in the universe D. The national debt E. Students at a college 7. Which of the following aqueous compounds is a strong acid? A. HNO
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This note was uploaded on 10/23/2009 for the course CHE che 2a taught by Professor Tingguo during the Fall '08 term at UC Davis.

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Exam I - F08 KEY - Name_ Student ID Number_ Lab TA Name and...

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