chem1a-Fall_2006-final-Pines_Kubinec-soln

chem1a-Fall_2006-final-Pines_Kubinec-soln - Chemistry 1A,...

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Page 1 Chemistry 1A, Fall 2006 Final Exam, Version B Dec 12, 2006 (180 min, closed book) Name:___________________ SID:_____________________ GSI Name:________________ There are 60 Multiple choice questions worth 4.34 points each. There are 13 short answer questions. For the multiple choice section, fill in the Scantron form AND circle your answer on the exam. Put your final answers in the boxes provided. Answers outside the boxes may not be considered in grading. The homework and chemquizzes that each question is based upon is listed after the question e.g. [HW 1.13, CQ 7.3] Question Page Points Score Question 61 - 63 14 22 Question 64 - 67 15 28 Question 69 – 69 16 12 Question 70-72 17 12 Question 72 – 73 18 16 Total 90
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Page 2 1.) Which is a possible electronic configuration for O + ? A) 1s 2 2s 2 2p 4 B) 1s 2 2s 2 2p 2 3s 1 C) 1s 2 2s 2 2p 6 3s 1 D) 1s 2 2s 2 2p 5 E) None of these 2.) The following is a plot of electron kinetic energy vs. photon energy for the interaction of photons and oxygen atoms. What does point ‘I’ represent? A) electronegativity of O B) electron affinity of O C) D) atomic radius of O E) photons emitted by O 3.) In a one mole sample of carbon atoms, how many protons are in each nucleus? A) 5 C) 7 D) 8 E) cannot be determined 4.) In a one mole sample of carbon atoms, how many neutrons are in each nucleus? A) 5 B) 6 C) 7 D) 8 5.) What is the minimum energy (J) required to eject an electron from chromium metal? The work function for chromium metal is 7.00 × 10 -19 J. [HW 1.14] A) 7.00 × 10 -19 B) 1.41 × 10 -18 C) 2.11 × 10 -12 D) 4.45 × 10 -23 E) 8.11 × 10 -18 I II E k hv
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Page 3 6.) What wavelength radiation (nm) must be used to eject electrons from chromium metal with a velocity of 1.50 x 10 6 m/s? The work function for chromium metal is 7.00 × 10 -19 J. [HW 1.14] A) 4.67 B) 23.4 C) 101 D) 512 E) 7.) What energy (in Rydbergs) is required to excite an He +1 ion from its ground state to its first excited state? [HW 1.23, 1.25] A) 14 B) 25 C) 101 D) E) 87 8.) How many electrons in an atom can have the quantum numbers n=5, l = 2? [HW 1.53] A) 1 B) 2 C) 6 E) 32 9.) Which statement is true for many electron atoms? [HW 1.59, discussion] A) B) The effective nuclear charge is independent of the number of electrons in an atom. C) Electrons with l = 2 are better at shielding than those with l = 1. D) Electrons may share the same set of quantum numbers for short times. E) Electrons cannot share orbitals. 10.) Which neutral element would have the ground state electronic configuration [Ne]3s 2 3p 5 ? [HW 1.67] A) O C) Ar D) P E) Al 11.) What is the arrangement of the following atoms in order of decreasing atomic radius? Sulfur (S), Chlorine (Cl), Silicon (Si) [HW 1.82] A) S, Cl, Si B) Si, Cl, S C) Cl, S, Si D) E) S, Si, Cl
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Page 4 12.) Which would be the mass spectrum of the products when acetylene (C 2 H 2 ) is burned in oxygen? A) B) C) D) E) 13.) What is the formal charge on the oxygen atom in the ONF molecule? [HW 2.33, 2.43] A) -2 B) -1 D) +1 E) +2 14.) What is the shape of the ONF molecule? [HW 2.33, 3.7] A) Linear B) C) Trigonal planar D) Trigonal pyramid E) Tetrahedral 15.) Which intermolecular forces are important in liquid ONF? [HW 5.1] I: Dispersion / VanderWaals forces II: Dipole-dipole forces III: Hydrogen bonding A) I only B) II only C) III only E) I, II and III 16.) What is the I-I-I bond angle in I 3 - ? [HW 3.9]
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This note was uploaded on 03/30/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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chem1a-Fall_2006-final-Pines_Kubinec-soln - Chemistry 1A,...

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