Unit 2 Exam Multiple Choice-solutions

Unit 2 Exam Multiple Choice-solutions - Version 024 Unit 2...

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Unformatted text preview: Version 024 Unit 2 Exam Multiple Choice vanden bout (50985) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Vanden Bout/La Brake - CH301 9:30 am class - 50985 Rydberg : R = 2 . 178 10- 18 J R = 3 . 29 10 15 s- 1 c = 3 . 00 10 8 m / s h = 6 . 626 10- 34 J s 1 eV = 1 . 602 10- 19 J 001 3.0 points Which set of quantum numbers is possible for the highest energy orbital found in the ground state of a antimony atom (Sb)? 1. n = 5 , = 1 , m =- 2 , m s =- 1 2 2. n = 4 , = 1 , m = +1 , m s = + 1 2 3. n = 4 , = 2 , m =- 2 , m s = + 1 2 4. n = 5 , = 1 , m = +1 , m s = + 1 2 correct 5. n = 5 , = 2 , m =- 2 , m s =- 1 2 Explanation: Antimonys highest energy ground state electron is a 5p electron. n = 5 = 1. Then m can be -1,0, or +1 and m s can be +1/2 or-1/2. 002 3.0 points What ion would you expect P to form? Would the P atom lose or gain electrons in this pro- cess? 1. P 2- ; gain 2 electrons 2. P 3+ ; lose 3 electrons 3. P 3- ; gain 3 electrons correct 4. P 5+ ; gain 5 electrons 5. P 5- ; lose 5 electrons 6. P 2+ ; lose 2 electrons Explanation: 003 3.0 points An electron in a hydrogen atom moves from the n = 2 to n = 5 level. What is the wave- length of the photon that corresponds to this transition and is the photon emitted or ab- sorbed during this process? 1. 276 nm; emitted 2. 434 nm; emitted 3. 276 nm; absorbed 4. 1875 nm; emitted 5. 1875 nm; absorbed 6. 434 nm; absorbed correct Explanation: 004 3.0 points Consider the following reaction: 2 A (g) + 3 B (g)- C (g) + D ( ) If 37 L of gas A is mixed with 42 L of gas B at the same pressure and temperature to give an initial volume of 79 L. After A and B react, the total volume changes. Assuming that the reaction runs to completion (and that you can ignore the volume from any liquid that is formed), what is the final volume? 1. 17.0 2. 23.0 3. 7.0 4. 19.0 5. 13.0 Version 024 Unit 2 Exam Multiple Choice vanden bout (50985) 2 6. 29.0 7. 31.0 8. 27.0 9. 25.0 10. 11.0 Correct answer: 23 L. Explanation: Because the pressure and temperature are constant, the problem can be worked in liters (volume units) instead of moles. 42 L of B 2 L of A 3 L of B = 28 L A reacts This will leave behind (excess) A = 37 - 28 = 9 L excess A amount of C made = 42 L B (1/3) = 14 L of C made. So the total volume after the reaction is the C made PLUS the excess of A which is 14 + 9 = 23 L for the system. 005 3.0 points In constructing the Lewis dot formula for phosgene (COCl 2 ) where C is the central atom, the quantities for N (needed electrons), A (available electrons) and S (shared elec- trons) are 1. N = 32, A = 26, S = 8....
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Unit 2 Exam Multiple Choice-solutions - Version 024 Unit 2...

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