exam 1 answers - Iype, Shelby Exam 1 Due: Sep 20 2007,...

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Unformatted text preview: Iype, Shelby Exam 1 Due: Sep 20 2007, 11:00 pm Inst: Vandenbout 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Vandenbout 2pm c = 3 10 8 m/s N A = 6 . 022 10 23 mol- 1 h = 6 . 626 10- 34 J s = R 1 n 2 1- 1 n 2 2 R = 3 . 29 10 15 Hz E n =- h R n 2 h R = 2 . 18 10- 18 J n ( x ) = 2 L 1 2 sin nx L n = 1 , 2 , E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , - h 2 2 m d 2 d x 2 + V ( x ) = E 001 (part 1 of 1) 10 points How many electrons can have the quantum numbers n = 5; = 3; m =- 1 in an atom? 1. 8 2. 5 3. 6 4. 2 correct 5. 3 Explanation: 002 (part 1 of 1) 10 points Which of the following electron configurations would represent an alkaline earth metal? 1. [Ne] 3 s 2 correct 2. [Ar] 4 s 1 3. [Ar] 3 d 5 4 s 2 4. [He] 2 s 2 2 p 3 5. [Ne] 3 s 2 3 p 5 Explanation: 003 (part 1 of 1) 10 points For which of these elements would the electron affinity process shown be more favorable? 1. Be + e- Be- 2. He + e- He- 3. Kr + e- Kr- 4. N + e- N- 5. C + e- C- correct Explanation: The one for C as it results in a half-full set of 2p orbitals. All of the other processes either require the electron to be placed into a new Iype, Shelby Exam 1 Due: Sep 20 2007, 11:00 pm Inst: Vandenbout 2 orbital of higher energy, or to be placed into an already half-full (and so already more stable) set of orbitals; either of which is unfavorable. 004 (part 1 of 1) 10 points Which of these name/symbol combinations is incorrect? 1. potassium : P correct 2. arsenic : As 3. boron : B 4. nickel : Ni 5. silicon : Si Explanation: The symbol for potassium is K. 005 (part 1 of 1) 10 points Choose the pair of names and formulas that do not match. 1. SnCl 4 : tin(IV) chloride 2. SiCl 4 : silicon tetrachloride 3. MgSO 3 : magnesium sulfate correct 4. NaNO 3 : sodium nitrate 5. N 2 O 3 : dinitrogen trioxide Explanation: The SO 3 2- ion is the sulfite ion. MgSO 3 should be correctly named magnesium sulfite. SiCl 4 and N 2 O 3 are both covalent com- pounds and are named correctly using the appropriate prefixes. The stannic ion is Sn 4+ ; the chloride ion is Cl- . Four Cl- are needed to balance the charge of each Sn 4+ , so the formula is SnCl 4 is correct. The sodium ion is Na + ; the nitrate ion is NO 3- . One NO 3- is needed to balance the charge of each Na + , so the formula NaNO 3 is correct. 006 (part 1 of 1) 10 points According to the Bohr explanation of the hydrogen emission spectrum, the individual lines of this spectrum 1. depend directly on the differences in en- ergy between the energy levels the electron is permitted to have. correct 2. depend directly on the absolute energies which the electron is permitted to have in the hydrogen atom....
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exam 1 answers - Iype, Shelby Exam 1 Due: Sep 20 2007,...

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