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W07 quiz1 key - Dr Manashi Chattety'ee Wmter 2007 Chem 30A...

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Unformatted text preview: Dr. Manashi Chattety'ee Wmter 2007- Chem 30A Quiz # I Name Of your TA: Greg / Paul / Eric (Please Circle) Total / 35 Chem 30 A Winter 2007 Quiz # 1 ,> (15 mins) Wednesday January17, 2007 I“ Mg S1 P 1.2 1.5 1.8 21 2.5 Ca Ga Ge As Se Br 10 16 1.8 2.0 2.4 2 8 1.0 1.7 1.8 1.9 2.1 2.5 Electronegativity values for some atoms (Pauling scale) DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO Dr. Manashi Chatterj’ee Winter 2007— Chem 30A Quiz # 1 Q8. 1 to 5 are 2 points each 1. Which molecules are polar? H2CBCH2 /c\ CHzclz H3C-6H3 CD130” I II III IV v (A) IH, IV, V (B) I, IV (C) II, 111, V (D) I, 111 Answer is: C 2. Which of the following molecular formulas corresponds to an ionic species? a. SiH4 b. Ang c. CH4 d. BH4 Answer is: D 3. Which of the following structures has the wrong polarity distribution (partial charges)? 6— 6+ 6+ 6- 6+ 5— 5+ 5- H30‘—"‘MgBr H3O BHS H30 0H H30 NH2 d Answer is: B 4. Which of the following Lewis structures are correct? H H H H __ |__l I .9 | .. H—o:o —H H—N—N -H H—tle—g : H—c—gl : H H l 11 III IV (A) I, II (B) II, IV (C) HI, IV (D) I, III C Answer is: 5. Identify which of the following compound is a secondary amine? THa \ I ' Answeris c / \ __ =-- H3c/I\NH2 / H30 H H C_N N CH3 CH3 .. a b c d l Prim"? (ulnar? Wk 2 /"‘>BHL, k) elet’m Dr. Manashi Chatterjee Winter 2007- Chem 30A Quiz # 1 6. Unshared, or lone electron pairs play an important role in determining the chemical and physical properties of organic compounds. Use the structural formulas below to determine the number of unshared pairs at each designated atom. Be sure your answers are consistent with the formal charges on the formulas. ‘ (5 points) a 2 /O\@/CH3 The number of unshared electron pairs on atom a is _ H3C b c I The number of unshared electron pairs on atom b is O H e u o a 9/0 The number of unshared electron pairs on atom a IS 0 _ ”20:;N\ The number of unshared electon pairs on atom b is c 0 e The number of unshared electron pairs on atom c is 3 __ 7. What is the correct structure for the aldehyde which has the formula C4HgO? (2 points) {V {MMYi Answer Is: 8. Draw the complete Lewis dot structure of C02 and 802. Indicate the shape of each of the molecule. (8 points) 9 Lewis Dot structure of C02 Shape of C02 is: Uncut/r Dr. Manashi Chatterjee Winter 2007- Chem 30A Quiz # 1 9. Draw the Lewis Dot structure of NaOCl (sodium hypochlorite an active ingredient in bleach). Indicate the types of bonds present in the molecule. Give a reason to your answer using electronegativity difference between the atoms involved. (5 points) Types of bonds: N; ‘0 _ ionic bond (3.5.. (33-5) 0'0 001/an 35—3 : -5) 10. Circle and Name (next to the circle) all the functional groups that are present in the following molecules. (5 points) ester l. Pyrethrin (a natural insecticide) Penicillin G (an antibiotic) ...
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