2 Chemistry 1304 Exam 5 (105 points) Name (please print) May 4, 2015 Circle ONLY the LETTER of your answer. (3 points each) 1. Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years? a. 1.90 mg d. 0.147 mg b. 0.725 mg e. 0.296 mg c. 6.77 mg f. none of these 2. Decay of silicon-27 by positron emission yields a. magnesium-23. d. aluminum-27. b. sulfur-31. e. phosphorus-27. c. silicon-26. f. none of these 3 3. Estimate the age of a bottled wine that has a tritium, H, content 60% that of freshly bottled wine. Tritium decays by beta decay and has a half-life of 12.3 yr. 3 1 H → 23 He + −01β a. 35 yr d. 16 yr b. 9.1 yr e. 7.4 yr c. 0.029 yr f. none of these 4. Which of the following is(are) true for generating electricity by nuclear power? a. no new nuclear power plants are being built d. lower natural gas prices have put the economic viability of nuclear power plants in doubt. b. the world's largest producer of electric power is China e. b and d c. current nuclear power plants use "light" water f. c and d 5. The primary difference(s) between a nuclear and coal or natural gas powered plants is(are) a. the type of turbine d. the method of distributing the power b. the size of the cooling towers e. all of the above c. the source of heat to generate steam f. none of these 6. Breeder reactors a. b. c. d. e. f. 7. (3 points) use Pu-230 that is recovered from the fission of U-238 are long tubes or tunnels used to separate U-238 from U-235 are the primary type of reactor in France are not used in the US because of the danger terrorists acquiring the fuel and using it for making bombs all of the above a, c, and d Complete and balance the following reaction. 1 0n + 235 92 U 1 → 3 0 n + 87 35 Br + 3 8. (7 points) The following questions pertain to the structure shown on the right. The small numbers next to the formula identify the individual atoms for reference in the following questions. 2 CH3 O N 3 C 4 CH2=CH 1 a. Insert any lone electron pairs that are not shown on the structure b. What is the hybridization at each of the following atoms? C2 c. C3 C4 N What are the approximate bond angles around each of the following centers? C1 N 9. (8 points) Draw the complete, fully expanded structure showing all atoms, including hydrogen, and all bonds in for each of the following compounds benzoic acid acetone 10. (6 points) Write the semi-condensed structural formulas for each of the following compound (show all important angles) phenyl acetate 5-bromo-cis-2-methyl-3-hexene 11. (5 points) Draw semi-condensed structural formulas for all possible isomers of C3H8O. 12. (8 points) Write the complete, systematic name of each of the following compounds. O CH3 CH CH2 CH CH2CH3 C C CH3 N 13. (4 points) CIRCLE ALL the asymmetric atoms in the compounds in the problem above. CH3 C O C CH3 O CH3 4 14. (8 points) Write complete structural formulas of the polymer produced from the following monomers. In the blank, indicate whether the polymerization process is addition, condensation, or ring-opening. CH3 O CH3 type of polymerization: NH2 HOOC type of polymerization: 15. (12 points) Retrosynthesis is a planning process of working backwards from a desired target molecule and determining which reactants can be used to make the molecule. This is usually a multistep process and is used to design pathways to complex, bioactive molecules. In the cases below, you need to use only one step. Show all of the starting molecules, and give any other reactants and conditions (H+, heat ∆, etc.) needed to make the product shown on the right for FOUR of the following five reactions. Write OMIT over the one you wish to skip or I will simply grade the first four regardless of which ones are correct! a. O O O O O O CH3 b. c. Cl CH3 CH3CH2 NH2+ClCH3 d. CH2 O CH3 H e. CH3 N CH3 C O 5 16. (21 points) Draw complete structural formulas for products of the reaction sequence shown below . You may write either fully or partially condensed formulas as long as the molecular structure, including the positions of functional group, is clearly shown. The full formula of the starting compound A is C7H12O. [Note that it is often helpful to show all atoms, including H at the site of the reaction.] H C O [O] A "H2" B + HBr + 2-propanol E H+ ∆ F C + NaOH - 2-propanol G + HBr D + NaOH H (an isomer of F) B 2 Chemistry 1304 Exam 5 (100 points) Name (please print) May 4, 2015 Circle ONLY the LETTER of your answer. (3 points each) 1. Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years? a. 1.90 mg d. 0.147 mg b. 0.725 mg e. 0.296 mg c. 6.77 mg f. 2. Decay of silicon-27 by positron emission yields a. magnesium-23. d. aluminum-27 b. sulfur-31. e. phosphorus-27. c. silicon-26. f. 3 3. Estimate the age of a bottled wine that has a tritium, H, content 60% that of freshly bottled wine. Tritium decays by beta decay and has a half-life of 12.3 yr. 3 1 H → 23 He + −01β a. 35 yr d. 16 yr b. 9.1 yr e. 7.4 yr c. 0.029 yr f. 4. Which of the following is(are) true for generating electricity by nuclear power? a. no new nuclear power plants are being built d. lower natural gas prices have put the economic viability of nuclear power plants in doubt. b. the world's largest producer of electric power is China e. b and d c. current nuclear power plants use "light" water f. c and d 5. The primary difference(s) between a nuclear and coal or natural gas powered plants is(are) a. the type of turbine d. the method of distributing the power b. the size of the cooling towers e. all of the above c. the source of heat to generate steam f. none of these 6. Breeder reactors a. b. c. d. e. f. 7. (3 points) use Pu-230 that is recovered from the fission of U-238 are long tubes or tunnels used to separate U-238 from U-235 are the primary type of reactor in France are not used in the US because of the danger terrorists acquiring the fuel and using it for making bombs all of the above a, c, and d Complete and balance the following reaction. 1 0n + 235 92 U 1 → 3 0 n + 6 87 35 Br + 3 8. (7 points) The following questions pertain to the structure shown on the right. The small numbers next to the formula identify the individual atoms for reference in the following questions. 2 CH3 O N 3 C 4 CH2=CH 1 a. Insert any lone electron pairs that are not shown on the structure b. What is the hybridization at each of the following atoms? C2 c. C3 C4 N What are the approximate bond angles around each of the following centers? C1 N 9. (8 points) Draw the complete, fully expanded structure showing all atoms, including hydrogen, and all bonds in for each of the following compounds benzoic acid acetone 10. (6 points) Write the semi-condensed structural formulas for each of the following compound (show all important angles) phenyl acetate 5-bromo-cis-2-methylhexene 11. (5 points) Draw semi-condensed structural formulas for all possible isomers of C3H8O. 12. (8 points) Write the complete, systematic name of each of the following compounds. O CH3 CH CH2 CH CH2CH3 C C CH3 N 5 13. (4 points) CIRCLE ALL the asymmetric atoms in the compounds in the problem above. CH3 C O C CH3 O CH3 4 14. (8 points) Write complete structural formulas of the polymer produced from the following monomers. In the blank, indicate whether the polymerization process is addition, condensation, or ring-opening. CH3 O CH3 type of polymerization: NH2 HOOC type of polymerization: 15. (12 points) Retrosynthesis is a planning process of working backwards from a desired target molecule and determining which reactants can be used to make the molecule. This is usually a multistep process and is used to design pathways to complex, bioactive molecules. In the cases below, you need to use only one step. Show all of the starting molecules, and give any other reactants and conditions (H+, heat ∆, etc.) needed to make the product shown on the right for FOUR of the following five reactions. Write OMIT over the one you wish to skip or I will simply grade the first four regardless of which ones are correct! a. O O O O O O CH3 b. c. Cl CH3 CH3CH2 NH2+ClCH3 d. CH2 O CH3 H e. CH3 N CH3 C O 5 16. (21 points) Draw complete structural formulas for products of the reaction sequence shown below . You may write either fully or partially condensed formulas as long as the molecular structure, including the positions of functional group, is clearly shown. The full formula of the starting compound A is C7H12O. [Note that it is often helpful to show all atoms, including H at the site of the reaction.] H C O [O] A "H2" B + HBr + 2-propanol E H+ ∆ F C + NaOH - 2-propanol G + HBr D + NaOH H (an isomer of F) B
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