Final.Form B.YellowVersion.Answers.2008

Final.Form B.YellowVersion.Answers.2008 - Chem. 1B Final...

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1 Chem. 1B Final FORM B First letter of your last name: March 20, 2008 Name: Last Name First Name Perm # INSTRUCTIONS: No hats allowed. No sharing of calculators. Cell Phones, iPods, headsets, etc. must be turned off and put away. SCANTRON FORM: Use a PENCIL 1) Write your name 2) Bubble in FORM B 3) Bubble in your PERM number (7 digits only, no extra numbers) INFORMATION PAGE: An information page is provided separately. No other notes or books are allowed. There are 8 pages, 32 questions. Each question is worth 5 points. SHOW ALL YOUR WORK on the exam. Turn in the Scantron form and your Exam . 1. Which of the following atoms or ions has 2 unpaired electrons? a) N b ) N i ANSWERS are given on the last page c) S 2– d) Zn e) Al 2. Which of the following electronic configurations correspond to an excited state? I . 1 s 2 2s 2 2p 1 II. 1s 2 2s 2 3p 4 III. 1s 2 2s 2 2p 4 3s 2 IV. [Ar]4s 2 3d 4 4p 3 a) I and II b) I, II, and III c) I, II, III, and IV d) I, III, and IV e) II, III, and IV 3. Identify the atom with the electron configuration [Ar]4s 2 3d 4 4p 3 . a) As b) Co c) Ni d) Cu e) Fe
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2 4. What is the maximum number of electrons in an atom that can have the quantum numbers n = 3, m l = +1. a) 2 b) 4 c) 6 d) 8 e) 10 5. Which of the following atoms has the smallest radius? a) Be b) B c) C d) N e) O 6. Which of the following elements is the most electronegative? a) Se b) P c) B d) N e) C 7. Which of the following bonds is the most polar? a) O – H b) H – Br c) O – N d) C – H e) N – H 8. The successive ionization energies for an unknown element are shown below. I E 1 = 580 kJ/mol I E 2 = 1815 kJ/mol I E 3 = 2740 kJ/mol I E 4 = 11,600 kJ/mol To which family in the periodic table does the unknown element most likely belong? a) Group 1A b) Group 2A c) Group 3A d) Group 4A e) Group 5A 9. What is the oxidation state of Be in Be 2 O 3 2– ? a) + 6 b) + 2 c) + 4 d) – 2 e) + 3 10. Consider the following reaction for galvanic cell at 25°C. Initially [Au 3+ ] = 5.00 M and [Ni 2+ ] = 4.00 M. Calculate the cell potential after the cell has operated long enough for [Au 3+ ] to have changed by 2.00 M. 2 Au 3+ (aq) + 3 Ni (s) 3 Ni 2+ (aq) + 2 Au (s) E o = 1.73 V a) 1.68 V b) 1.78 V c) 1.69 V d) 1.71 V e) 1.74 V
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3 11. Given the following two half reactions: Fe 3+ + 3 e Fe (s) E o = – 0.034 V Zn 2+ + 2 e Zn (s) E o = – 0.76 V Calculate the Δ G o , for the cell reaction at 25 o C. Zn (s) | Zn 2+ (aq) || Fe 3+ (aq) | Fe (s) a) – 420 kJ b) – 210 kJ c) – 140 kJ d) – 70.0 kJ e) – 463 kJ 12. A galvanic cell is constructed with a copper electrode in a CuSO
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Final.Form B.YellowVersion.Answers.2008 - Chem. 1B Final...

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