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Problem Set III Key - Chapter 3 Name K a\4 V Chem 343 ‘...

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Unformatted text preview: Chapter 3 Name: K a \4 V Chem 343 ‘ . Spring 2009 TA Name: ' I Problem Set III Discussion Secition # I. For each of the following questions or statements circle the letter corresponding to the correct answer. 1. When the Is orbitals of two hydrogen atoms combine to form a hydrogen molecule, Which molecular orbitals are formed? ' A) One bonding molecular orbital only B Two bonding molecular orbitals One bonding molecular orbital and one antibonding molecular orbital D) Two antibonding molecular orbitals E) Three bonding molecular orbitals V 2. Using the hybridization concepts of valence bond theory, identify the atomic orbitals in the C-C sigmabond in ethyne (Csz). ' A) (2sp2, 2sp2) . B (2sp3, 2sp3) (Zsp, 2sp) D) (2p, 2p) E) (2sp, Is) 3. According to the Lewis definition, a base is a(n): A Proton donor. (3) Electron pair donor. ' C) Hydroxide’ion donor. D) Hydrogen ion donor. E) Electron pair acceptor. Page 1 Chapter 3 4. Which of the following is not a conjugate acid ~ conjugate base pair (in that order)? A) H3PO4, H2P0'4' ' B) I'IBF4, BF4~ I l C) CH3CH20H, CH3CH20‘ D H30+, H20 L HPO4", H2PO4' 5. Which of the following is no_t a Lewis base? A) NH3 ) B) H” C CH30H im 6. For the equilibrium CH3NH3+ + H20 ‘1‘" CH3NH2 + H30+ the two substances which are acids are: A) H20 and H30+ B) CH3NH3+ and H20 C CH3NH3+ and CH3NH2 @CHgNH3+ and H30+ E) CH3NH2 and H20 7., Which of the acids below would have the strongest conjugate base? .CH3CH20H pKa = 18 B) CH3C02H pKa = 4.75 C) ClCHZCOZH pKa = 2.81 D) C12CHCOZH pKa = 1.29 E) C13CC02H pKa = 0.66 Page 2 II. Chapter 3 For each of the compounds or ions shown in the column at left, write yes or no in each of the boxes to the right to indicate whether it has a dipole moment and whether it can hydrogen bond with itself. Dipole Moment? Page 3 Chapter 3 III. For each pair of componnds, circle the one With the higher boiling point and indicate (by placing the correct letter on the blank line below the structure) the intermolecular forces primarily responsible for the higher boiling point: ' A = dipole _ B = hydrogen bonding C = van der Waals (London dispersion forces) lo (I) Page 4 Chapter 3 IV. For each of the following acid base reactions, draw curved arrows on the reactants to show how the reaction occurs (i.e. show movement of electron pairs), draw structures for the products of the reaction on the right hand side, and label each equilibrium as lying to ' the left or right. .- . 6 H—F: + \C/ \C/ v—g /—/3c~0’C/¥; + F L21" H/l . I\H . r H H - ' H Page 5 ' ...
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