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Unformatted text preview: Version 066 Exam 1 Mccord (50970) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points How many electrons could be described by the quantum numbers n = 5 and m s = + 1 2 ? 1. 25 correct 2. 50 3. 5 4. 2 5. 1 Explanation: For a given principle energy level, n , a total of 2 n 2 electrons are described. Exactly half of those, n 2 , will have a + 1 2 spin. 002 10.0 points The n and quantum numbers of the last electron of an element are n = 4 and = 3. The element is 1. a nonmetal. 2. a noble gas. 3. a representative element. 4. a d-transition metal. 5. an f-transition metal. correct Explanation: Where n = 4 and = 3, 4 f electrons are filling. These are the f-transition metals. 003 10.0 points An electron is confined to a one-dimensional box of length L. It falls from the second en- ergy level to the ground state, and releases a photon with a wavelength of 322 nm. What is the length of the box? 1. 1.14 nm. 2. 2.92 nm. 3. 4.32 nm. 4. 322 nm. 5. 0.151 nm. 6. 292 nm. 7. 0.303 nm. 8. 1.61 nm. 9. 0.541 nm. correct Explanation: 004 10.0 points What is the electronic configuration of Hg? 1. [Xe] 6 s 2 5 d 10 2. [Xe] 6 s 2 4 f 14 5 d 10 correct 3. [Rn] 6 s 2 4 f 14 5 d 10 4. [Xe] 6 s 3 4 f 14 5 d 9 5. [Kr] 5 s 3 4 d 9 Explanation: 005 10.0 points How many electrons can possess this set of quantum numbers: principal quantum num- ber n = 4, angular quantum number = 2? 1. 10 correct 2. 6 3. 12 4. 5. 18 Version 066 Exam 1 Mccord (50970) 2 6. 14 7. 4 8. 2 9. 16 10. 8 Explanation: Use the rules for the quantum numbers: If n = 4 and = 2 ( i.e. , 4 d ), then m =- 2 ,- 1 , , +1 , +2 are permitted; there are five different orbitals and m s = 1 2 , each holding two electrons. 006 10.0 points An electron in a 3 d orbital could have which of the following quantum numbers? 1. n = 3; = 0; m = 0 2. n = 2; = 3; m = 0 3. n = 3; = 2; m = 0 correct 4. n = 3; = 1; m =- 1 5. n = 3; = 2; m =- 3 6. n = 3; = 3; m = 1 7. n = 2; = 2; m = 2 Explanation: 3 refers to the principal quantum number n . d corresponds to the subsidiary quantum number = 2. Since = 2, m could be- 2 ,- 1 , , 1 or 2. 007 10.0 points In a many-electron atom, any two electrons 1. have a different energy. 2. can have either the same or a different energy. correct 3. have the same energy. Explanation: Energy is determined by distance. Elec- trons can have the same energy (distance from the nucleus) but have different sets of quan- tum numbers. 008 10.0 points It takes light with a wavelength of 261 nm, or less, to break the O H bond in wa- ter. What energy does this correspond to (in kJ/photon) and what is the O H bond strength in kJ/mol?...
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This note was uploaded on 04/30/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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solution_pdf1 - Version 066 Exam 1 Mccord (50970) 1 This...

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