exam 1 answers - Iype Shelby Exam 1 Due 11:00 pm Inst...

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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 – fnd 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 ν = R µ 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 ψ n ( x ) = µ 2 L 1 2 sin nπx L · n = 1 , 2 , ··· E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , - ¯ h 2 2 m d 2 ψ d x 2 + V ( x ) ψ = 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 confgurations 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 ±or which oF these elements would the electron a²nity 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
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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 sulFte ion. MgSO 3 should be correctly named magnesium sulFte. SiCl 4 and N 2 O 3 are both covalent com- pounds and are named correctly using the appropriate preFxes. The stannic ion is Sn 4+ ; the chloride ion is Cl - . ±our 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 di²erences 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. 3. are spaced at equal intervals along the wavelength scale. 4. are due to the di²erent number of neu- trons present.
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exam 1 answers - Iype Shelby Exam 1 Due 11:00 pm Inst...

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