exam1 f04 - Name_ Student ID Number_ Lab TA Name and Time_...

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Name______________________________________ Student ID Number___________________________ Lab TA Name and Time_________________________ Fall 2004 – Enderle CHEMISTRY 2A Exam I 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 1–14. 28 points 15. 10 points 16. 8 points 17-18. 22 points 19. 12 points 20. 9 points 21. 11 points Total Score (100) Multiple Choice (circle one) 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
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Exam I Page 2 of 13 Part I: Multiple Choice, Concepts Circle the correct answer and enter your response on the cover – No partial credit 1. With mass spectral data the ratio of the mass of 11 B/ 12 C was found to be 0.917. According to the data, what is the mass of the 11 B atom? A. 10.929 u B. 11.004 u C. 12.917 u D. 11.009 u E. 11.996 u 2. A atom which differs in charge from another neutral atom of the same element I) has more or less neutrons II) has the same number of protons III) has lost or gained electrons IV) is called an ion V) is called an isotope A. I and II B. I and V C. I, III and V D. II , III and IV E. III only 3. The total numbers of neutrons, protons, and electrons in 22 Ne 2+ are: A. 12 neutrons, 10 protons, 8 electrons B. 10 neutrons, 22 protons, 8 electrons C. 12 neutrons, 10 protons, 12 electrons D. 10 neutrons, 12 protons, 8 electrons E. 22 neutrons, 10 protons, 10 electrons
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Exam I Page 3 of 13 4. A hypothetical element Z has only two stable isotopes: 46 Z = 46.046 u (64.080%) 51 Z = unknown mass (35.920%) The average atomic weight of the element is 47.763 u. What is the mass of the 51 Z isotope? A. 61.780 u
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This note was uploaded on 04/05/2008 for the course CHE 002A taught by Professor Enderle during the Spring '08 term at UC Davis.

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exam1 f04 - Name_ Student ID Number_ Lab TA Name and Time_...

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