che1 - Version 107 – Exam1: Shear – shear – (52375) 1...

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Unformatted text preview: Version 107 – Exam1: Shear – shear – (52375) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. In all cases, select the answer that BEST answers the question asked. The total points on this exam is 300. Some questions provide fundamental constants in addition to those given here and on the scantron sheet. Watch your units! Shear 52375 c = 3 . 00 × 10 8 m/s h = 6 . 626 × 10- 34 J · s m e = 9 . 11 × 10- 31 kg N A = 6 . 022 × 10 23 mol- 1 Δ E = R parenleftbigg 1 n 2 1- 1 n 2 2 parenrightbigg where R =- 2 . 178 × 10- 18 J ψ n ( x ) = parenleftbigg 2 L parenrightbigg 1 2 sin parenleftBig nπx L parenrightBig E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , ··· 001 10.0 points If a particle is confined to a one-dimensional box of length 300 pm, for Ψ 3 the particle has zero probability of being found at 1. 100 and 200 pm, respectively. correct 2. 50, 150, and 250 pm, respectively. 3. 75, 125, 175, and 225 pm, respectively. 4. 50 and 250 pm, respectively. 5. 150 pm only. Explanation: 100 200 300 002 8.0 points Which color in the rainbow has the longest wavelength? 1. green 2. blue 3. yellow 4. orange 5. red correct Explanation: Ordered by wavelengths, blue < green < yellow < orange < red 003 15.0 points What is the energy of a photon emitted from an electron in a hydrogen atom when it jumps from the n = 7 to the n = 3 level? 1. 4 . 1524 × 10- 19 J 2. 1 . 97728 × 10- 19 J correct 3. 7 . 9093 × 10- 20 J 4. 2 . 1800 × 10- 20 J Explanation: ν = R parenleftbigg 1 n 2 1- 1 n 2 2 parenrightbigg = 3 . 29 × 10 15 s- 1 parenleftbigg 1 9- 1 49 parenrightbigg = 2 . 98413 × 10 14 s- 1 , so E = hν = (6 . 626 × 10- 34 J · s) × (2 . 98413 × 10 14 s- 1 ) = 1 . 97728 × 10- 19 J Version 107 – Exam1: Shear – shear – (52375) 2 004 10.0 points Rank the following atoms in terms of decreas- ing atomic radius. 1. F, Mg, Na, O, N 2. F, O, N, Na, Mg 3. F, O, N, Mg, Na 4. Na, Mg, N, O, F correct 5. Na, N, O, Mg, F Explanation: As you move down the periodic table atomic radius increases because the shielding effects of inner electrons reduces the effective nuclear charge experienced by outer shell elec- trons. As you move across the periodic table the radius decreases because electrons are be- ing added to the same electronic shell (and thus do not add additional shielding effects) while the number of protons increases. Na, being farthest left and down the table, would be the largest while F, being farthest right and up the table, would be the smallest. 005 8.0 points Bohr’s theory of the hydrogen atom assumed that 1. electromagnetic radiation is given off when the electrons move in an orbit around the nucleus....
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This note was uploaded on 03/31/2010 for the course CH ch302 taught by Professor F during the Spring '09 term at University of Texas-Tyler.

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che1 - Version 107 – Exam1: Shear – shear – (52375) 1...

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