wadechapter_01practiceproblems - Organic Chemistry 6e(Wade...

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Organic Chemistry, 6e (Wade) Chapter 1: Introduction and Review 1) The atomic number of boron is 5. The correct electronic configuration of boron is: A) 1s 2 2s 3 B) 1s 2 2p 3 C) 1s 2 2s 2 2p 1 D) 2s 2 2p 3 E) 1s 2 2s 2 3s 1 Answer: C Diff: 1 2) Atoms with the same number of protons but different numbers of neutrons are called __________. 3) The electron density of __________ orbitals has spherical symmetry. 4) Draw the shape of a 2p orbital. Diff: 2 5) How many distinct p orbitals exist in the second electron shell, where n = 2? 6) An oxygen atom has __________ valence electrons. Answer: 6 Diff: 1 7) Draw a correct Lewis structure for chloromethane, CH 3 Cl. Answer: Diff: 1
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8) Draw a correct Lewis structure for boric acid, B(OH) 3 . Answer: or Diff: 2 9) Draw a correct Lewis structure for tert -butyl alcohol, (CH 3 ) 3 COH. Answer: Diff: 2 10) Draw a correct Lewis structure for acetonitrile, CH 3 CN. Answer: Diff: 2 11) Which of the following are correct Lewis structures, including formal charges, for nitric acid, HNO 3 ? 2
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12) Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond determines this? 13) The compound methylamine, CH 3 NH 2 , contains a C–N bond. In this bond, which of the following best describes the charge on the carbon atom? 14) The formal charge on oxygen in dimethyl ether, CH 3 OCH 3 , is: A) +2 B) +1 C) 0 D) -1 E) -2 Answer: C Diff: 1 15) The formal charge on nitrogen in the compound below is __________. 3
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16) Which of the following choices represent(s) a pair of resonance forms? 17) The Lewis structure of trimethylamine is shown below. Draw the condensed structural formula which corresponds to this Lewis structure. 18) The Lewis structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure. 4
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19) Draw an acceptable line-angle formula for cyclobutanol (shown below). Diff: 2 20) Draw an acceptable line-angle formula for the compound shown below. Diff: 2 21) Draw a correct Lewis structure for acetaldehyde, CH 3 CHO. Diff: 2 22) A sample of compound X is subjected to elemental analysis and the following percentages by weight are found: 39.97% C, 6.73% H, and 53.30% O. The molecular weight of X is 90. What is the empirical formula of X? 5
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23) Calculate the pH of a 250 mL aqueous solution which contains 0.70 g of HCl. Answer: 1.11 Diff: 2
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