Exam 2 Key

Exam 2 Key - PreparationforGeneralChemistry:Chem50

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Preparation for General Chemistry: Chem 50 Exam 2, Fall 2011, October 24 2011 Instructor: Ram Subramaniam 1. Which subatomic particle has a relative charge of 0 and a mass of ~1 amu? A) alpha B) electron C) neutron D) proton E) none of the above Answer: C 2. Using atomic notation, indicate the isotope having 26 p + , 32 n 0 , and 26 e - . A) Fe B) Fe C) Fe D) S E) S Answer: B 3. How many neutrons are in the nucleus of an atom of bromine-79? A) 35 B) 44 C) 79 D) 114 E) none of the above Answer: B 4. Element Z has two natural isotopes: Z-79 (78.918 amu) and Z-81 (80.916 amu). Calculate the atomic mass of element Z given the abundance of Z-81 is 49.31%. A) 79.00 amu B) 79.90 amu C) 80.00 amu D) 119.93 amu E) 120.92 amu Answer: B 5. What is the maximum number of electrons that can occupy the 4th principal energy level? A) 1 B) 2 C) 4 D) 8
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E) none of the above Answer: E 6. What is the electron configuration for an atom of nickel? A) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 8 B) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 8 C) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 4 p 8 D) 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 4 d 8 E) none of the above Answer: B 7. Which element has the following electron configuration: 1
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This note was uploaded on 12/12/2011 for the course CHEM 50 taught by Professor Subramaniam during the Fall '11 term at UCSD.

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Exam 2 Key - PreparationforGeneralChemistry:Chem50

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