Final - Fall 07

Final - Fall 07 - CHE 131 Final Exam, Fall 2007 Multiple...

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CHE 131 Final Exam, Fall 2007 Multiple Choice On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Which of the following statements is incorrect ? A. The benzene molecule has six pi electrons. B. All six C-C bonds in benzene are equivalent. C. Aromaticity refers to the special electronic stability of the benzene ring and related unsaturated ring systems. D. Benzene readily undergoes addition reactions. E. Molecules with benzene rings occur in many aromatic oils. ____ 2. Gaseous carbon monoxide is very dangerous if breathed. A sample of CO exerts a pressure of 120 mm Hg in a 56.0 L tank at 22°C. If all of the CO leaks into a room with a volume of 2.70 × 10 4 L at 22 °C, what is the partial pressure of CO in the room? A. 0 B. 0.25 C. 2.5 D. 25 E. 250
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____ 3. How many enantiomers can exist for the following molecule? A. 0 B. 1 C. 2 D. 3 E. 4 ____ 4. Calculate the % Mg by mass in a 1.72 g sample that produced 6.46 g of MgCl 2 when reacted with excess HCl. Mg(s) + HCl(aq) Æ MgCl 2 (aq) + H 2 (g) Molar masses: Mg: 24.31 g/mol HCl: 36.46 g/mol MgCl 2 : 95.21 g/mol H 2 : 2.02 g/mol A. 1.6 B. 3.2 C. 12 D. 48 E. 96 ____ 5. Which of the following compounds is most soluble in water? A. AgCl B. CaCO 3 C. Al(OH) 3 D. K 2 SO 4 E. MgS
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____ 6. Which of the following statements about ionic compounds is incorrect ? A. Most ionic compounds are soluble in water, at least to some extent. B. Solutions of ionic compounds in water conduct electricity. C. Most ionic compounds have high boiling points. D. Crystals of ionic compounds tend to cleave readily along smooth planes. E. Crystals of ionic compounds generally are good electrical conductors. ____ 7. Identify the Lewis acid and base in the following reaction: SO 2 + BF 3 Æ O 2 SBF 3 A. acid = F, base = O B. acid = F, base = S C. acid = S, base = B D. acid = B, base = S E. acid = B, base = O ____ 8. The predicted Cl–S–Cl bond angle(s) in SCl 4 is (are) closest to: A. 109° B. 60°, 90°, and 120° C. 109° and 180° D. 90°, 120°, and 180° E. 109° and 120° ____ 9. Which of the following monomers can be used to make this polymer? CH 3 CH 3 | | •••CH 2 —CH—CH 2 —CH—CH 2 —CH—CH 2 —CH—CH 2 —CH—••• | | | CH 3 CH 3 CH 3 A. CH 2 =CH 2 B. CH 2 =C=CH 2 C. CH 3 -CH=CH 2 D. CH 2 =CH-CH=CH 2 E. CH 3 -CH=CH-CH 3
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____ 10. Which of the following pairs can react to form an ester? A. Carboxylic acid and amine B. Carboxylic acid and alcohol C. Alcohol and amine D. Carboxylic acid and amide E. Amide and alcohol ____ 11. Calculate the mass percent of oxygen in methyl paraben: C CC C C C O C O O CH 3 H H H H H A. 63% B. 5.30% C. 31.55% D. 71.4% E. 47.997% ____ 12.
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This test prep was uploaded on 04/17/2008 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Final - Fall 07 - CHE 131 Final Exam, Fall 2007 Multiple...

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