exam1answer - Gu Phillip Exam 1 Due Oct 4 2007 11:00 pm...

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Gu, Phillip – Exam 1 – Due: Oct 4 2007, 11:00 pm – Inst: Brodbelt 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Brodbelt CH301 Exam 1 October 3, 2007 Programmable calculators and cell phones are prohibited. You may not leave the room until you turn in your exam. GOOD LUCK! 001 (part 1 of 1) 10 points 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 is the electron configura- tion for which one of the following ions? 1. P 2+ 2. S + 3. P + 4. P 2 - correct 5. Cl - Explanation: We need an ion that has 2 + 2 + 6 + 2 + 5 electrons; i.e. , P 2 - . 002 (part 1 of 1) 10 points If the following equation is properly balanced, what are the coefficients in front of each com- pound? AlCl 3 + SCl 2 Al 2 S + Cl 2 1. 2; 2; 1; 5 2. 1; 2; 1; 2 3. 2; 2; 2; 5 4. 1; 1; 1; 1 5. 2; 1; 1; 4 correct 6. 1; 2; 1; 4 7. 2; 2; 1; 4 8. 2; 1; 2; 4 Explanation: AlCl 3 + SCl 2 Al 2 S + Cl 2 I’ll start with Al: 2 AlCl 3 + SCl 2 Al 2 S + Cl 2 Al and S are balanced. Balance Cl: 2 AlCl 3 + SCl 2 Al 2 + 4 Cl 2 Answer: 2, 1, 1, 4 003 (part 1 of 1) 10 points An electron occupies an atomic orbital that has the shape . All you can say about its four quantum numbers is 1. n = 1 or 2 or higher; = 1; m = - 1 , 0 , +1; m s = ± 1 2 . 2. n = 2 or higher; = 1; m = - 1 , 0 , +1; m s = ± 1 2 . correct 3. n = 1; = 1; m = - 1 , 0 , +1; m s = ± 1 2 . 4. n = 0; = 0; m = 0; m s = ± 1 2 . 5. n = 2 or higher; = 2; m = - 2 , - 1 , 0 , +1 , +2; m s = ± 1 2 . Explanation: Since is the shape of a p orbital, must be 1. can only be 1 when n = 2 or more, and the possible values of m are + 1, 0, and - 1 when is 1. 004 (part 1 of 1) 10 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?
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Gu, Phillip – Exam 1 – Due: Oct 4 2007, 11:00 pm – Inst: Brodbelt 2 1. 0.151 nm. 2. 0.303 nm. 3. 1.61 nm. 4. 292 nm. 5. 4.32 nm. 6. 322 nm. 7. 2.92 nm. 8. 0.541 nm. correct 9. 1.14 nm. Explanation: 005 (part 1 of 1) 10 points How many s electrons and p electrons does Mn possess? 1. 8 s , 6 p 2. 7 s , 18 p 3. 8 s , 12 p correct 4. 6 s , 18 p 5. 6 s , 6 p 6. 6 s , 12 p 7. 7 s , 12 p 8. 7 s , 13 p 9. 8 s , 18 p Explanation: The electron configuration for Mn is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 5 2 + 2 + 2 + 2 = 8 s 6 + 6 = 12 p 006 (part 1 of 1) 10 points According to the Rydberg description of atomic H, the wavelength of light emitted by an excited H gets longer 1. when the quantum numbers involved get closer together. correct 2. depending on the frequency of the orbit- ing electron. 3. when the initial excitation decreases. 4. when the initial excitation increases. 5. when the quantum numbers involved get further apart. Explanation: 007 (part 1 of 1) 10 points An electron is in the first quantum level in a box of length L. If the box is stretched so that the length doubles, what happens to the resulting energy of the electron? How would this influence the wavelength of a pho- ton needed to excite the electron to the second energy level?
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