1032_4th Exam_ (A)

Transcription

1 1032_4th Exam_ (A) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Define mass defect. A) an atom with too many neutrons B) energy absorbed in a radioactive reaction C) energy released in a radioactive reaction D) the difference in mass between an atom and the sum of its separate components E) the difference in mass between a radioactive atom and a nonradioactive atom 2) Describe what changes occur during alpha decay. A) The mass number and atomic number increases. B) The mass number and atomic number decreases. C) The mass number increases and the atomic number decreases. D) The mass number and atomic number do not change. E) The mass number is unchanged and the atomic number increases. Answer: B 3) Which particle has the lowest penetrating power? A) neutron particle B) alpha particle C) gamma particle D) electron emission E) positron capture Answer: B 4) The combination of two light nuclei to form a heavier nuclei is called. A) nuclear fission B) nuclear fusion C) half life D) radioactive cleavage E) radioactive merge Answer: B _A_1

2 5) The chart below shows the mass of a decaying nuclide versus time. What is the half-life of the decay? A) 70 min B) 25 min C) 35 min D) 15 min 6) Iron-59 is a beta emitter with a half-life of 44.5 days. If a sample initially contains 132 mg of iron-59, how much iron-59 is left in the sample after 265 days? A) 33.2 mg B) 0.00 mg C) 2.13 mg D) 66.0 mg 7) An artifact has a carbon-14 decay rate of 8.55 disintegrations per minute per gram of carbon (8.55 dis/min g C). Living organisms have carbon-14 decay rate of 15.3 dis/min g C. How old is the artifact? (The half-life of carbon-14 is 5730 yr.) A) yr B) yr C) yr D) yr 8) An igneous rock contains a Pb-206/U-238 mass ratio of How old is the rock? (U-238 decays into Pb-206 with a half-life of yr.) A) 2.05 * 109 yr B) yr C) yr D) yr 9) Calculate the nuclear binding energy per nucleon for cobalt-59, the only stable isotope of cobalt. The mass of cobalt-59 is amu. (The mass of H 1 1 is amu, and the mass of a neutron is amu.) A) MeV B) MeV C) MeV D) MeV Answer: A 10) Determine the identity of the daughter nuclide from the electron capture by Rb. A) Answer: E Sr B) Kr C) Br D) Y E) Kr _A_2

3 11) Write the nuclear equation for the alpha decay of Ra. A) Ra 1 0 n Ra B) Ra He Rn C) Ra 0-1 e Ac D) Ra He 2 90 Th E) Ra e Ac Answer: B 12) Which of the following nuclides are most likely to decay via beta decay? A) I-126 B) Al-24 C) Na-20 D) Cs-137 E) N-13 13) Determine the identity of the daughter nuclide from the beta decay of Sr. A) Answer: A Y B) Sr C) Se D) Y E) Kr 14) Calculate the mass defect in Mo-96 if the mass of a Mo-96 nucleus is amu. The mass of a proton is amu and the mass of a neutron is amu. A) amu B) amu C) amu D) amu E) amu 15) Determine the identity of the daughter nuclide from the positron emission of 13 7 N. A) O B) 8 9 F C) B D) C E) O 16) Determine the identity of the daughter nuclide from the alpha decay of Th. A) Answer: E U B) Ac C) Pa D) Th E) Ra 17) Write a nuclear equation to describe the spontaneous fission of 244 Am to form I-134 and Mo-107. Determine 95 how many neutrons are produced in the reaction. A) 3 B) 1 C) 0 D) 2 E) 4 Answer: A _A_3

4 18) Determine the identity of the daughter nuclide from the positron emission of 15 8 O. A) 14 7 N B) 15 6 C C) ) The following reaction represents what nuclear process? Pb 0-1 e Bi N D) C E) 6 9 F A) electron capture B) alpha emission C) beta emission D) gamma emission E) neutron bombardment 20) Which structure can exhibit optical isomerism? A) B) C) D) Answer: B _A_4

5 21) Determine the product of the reaction. A) B) C) D) 22) Which of the following compounds is an ketone? A) B) CH3CH2CH2CO2H C) D) CH3CH2NH2 E) _A_5

6 23) Arrange the following in order from least oxidized to most oxidized. A) III < I = II B) I < III < II C) I < II < III D) III < I < II E) II < I < III 24) Determine the products of the following reaction: A) B) C) D) E) _A_6

7 25) Name the following compound. A) 1-butanoate B) 1-butanal C) butanoic acid D) propyl methanoate E) propyl butanoate 26) Name the following compound. A) 2-butanal B) ethyl ethanoate C) 1-butanoic acid D) methyl propyl ether E) ethyl propanoate 27) Name the following compound. A) 3-ethyl-1-butyne B) 3-methyl-4-pentyne C) 1-hexyne D) 3-methyl-1-pentyne E) 2-ethynebutane _A_7

8 28) Determine the products of the following reaction: A) B) C) D) E) 29) Give the product of the reduction of the following compound. A) CH3CH2OCH3 B) CH3CH2CHO C) CH3CH2CH3 D) CH3CH2COOH E) CH3CH2CH2OH Answer: E _A_8

9 30) Which of the following compounds exhibit geometric isomerism? A) CH2=CH2 B) CH2=CCl2 C) CBr2=CHBr D) (CH3)2C=CH-CH3 E) CHCl=CHCl Answer: E 31) Complete and balance the following complete hydrogenation reaction. CH3CH2C CCH3 + 2 H2? A) CH3CH2C CCH3 + 2 H2 CH3CH2CH2CH2CH3 B) CH3CH2C CCH3 + 6 H2 5 CH4 C) 2 CH3CH2C CCH3 + 2 H2 CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3 D) CH3CH2C CCH3 + 2 H2 CH3CH2CH2 CH2CH3 E) CH3CH2C CCH3 + 3 H2 CH3CH2CH3 + CH3CH3 Answer: A 32) How many of the carbons in the following compound are chiral center(s)? A) 4 or more B) 1 C) 3 D) 2 E) 0 33) A carboxylic acid reacts an alcohol to form. A) an amine B) an anhydride C) an ether D) an ester E) an amide 34) Name the following compound. A) 4-methyl-4-propylpentane B) 4-propyl-4-methylpentane C) 2-methyl-2-propylpentane D) 4,4-dimethylheptane E) nonane _A_9

10 35) Which of the following names is correct? A) 2-ethyl-3-pentene B) 3,3-diethyl-4-propene C) 2-methyl-1-butene D) 1-propyl-2-pentene E) None of the above are correct. 36) Name the following compound. A) 1-pentanal B) 1-pentanone C) 1-hexenol D) hexanal E) pentenel 37) Determine the product(s) of the reduction of the following compound: A) B) C) D) E) Answer: E 38) Choose the polysaccharide from the compounds below. A) B) _A_10

11 C) D) E) 39) Which of the following is an example of an aldopentose? A) B) _A_11

12 C) D) E) Answer: A 40) Which of the following is an example of a ketohexose? A) _A_12

13 B) C) D) E) 41) Identify the sugar in DNA. A) galactose B) deoxyribose C) ribose D) fructose E) glucose Answer: B _A_13

14 42) What type of lipid is the following compound? A) steroid B) phospholipid C) fatty acid D) triglyceride E) glycolipid 43) Which of the following form between glycerol and fatty acids to form triglycerides? A) amide bonds B) ester linkages C) alcohol bonds D) disulfide linkages E) glycosidic linkages Answer: B 44) Which of the following link together amino acid units? A) glycosidic linkages B) peptide bonds C) hydrogen bonds D) sulfide linkages E) ester linkages Answer: B 45) How many nucleotides are required to code for all of the amino acids in a protein that contains 186 amino acids? A) 372 B) 1 C) 186 D) ) What is between the two strands of DNA, holding them together? A) dipole-dipole bonds B) ionic bonds C) covalent bonds D) hydrogen bonds E) London dispersion forces _A_14

15 47) The following is part of a DNA sequence. What is its complementary sequence? AGTTCGAGCCT A) AGTTCGAGCCT B) AGGCTCGAACT C) TCCGAGCTTGA D) TCAAGCTCGGA E) CAGTCCA 48) Which of the following statements is TRUE? A) Thymine and Adenine are a complementary base pair that forms 2 hydrogen bonds. B) Cytosine and Thymine are a complementary base pair that forms 3 hydrogen bonds. C) Thymine and Guanine are a complementary base pair that forms 2 hydrogen bonds. D) Adenine and Guanine are a complementary base pair that forms 3 hydrogen bonds. E) Cytosine and Guanine are a complementary base pair that forms 2 hydrogen bonds. Answer: A 49) How many of the carbons in the following structure are chiral? A) 4 or more B) 0 C) 3 D) 1 E) 2 50) Which compound is an amino acid? A) _A_15

16 B) C) D) Answer: A _A_16