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Chemistry 116: General Chemistry Syracuse University Project Advance Exam #4, Spring 2004 Name Date The last page of this examination is a periodic table (1) Alpha rays are (a) (b) (c) (d) (e) (2) The sum of the masses of two hydrogen atoms (mass number 1) and two neutrons is 4.0330. Why does this differ from the mass of a helium atom (4.0026)? (a) (b) (c) (d) (e) (3) extremely penetrating light quanta. electrons from the nucleus. electrons from outside the nucleus. helium molecules. helium +2 ions Some hydrogen atoms are heavier than others. The difference is the binding energy of the helium nucleus. The difference is the experimental error in the measurement of the masses. Because free neutrons have a very brief existence, we cannot measure heir mass directly and must use an average value which doesn’t fit every individual case accurately. Since there is nothing in common between the helium atom and the hydrogen atom, there is no reason to expect the agreement. Which fundamental particle is a product of the following nuclear reaction: 45Sc 21 (a) (b) (c) (d) (e) (4) + 4He2 ------> 48Ti 22 + ? deuteron positron proton neutron electron In the nucleus of an atom of atomic number 82 and mass of 206 there are (a) (b) (c) (d) (e) CHE 116 82 neutrons 82 protons 124 electrons 206 neutrons 124 protons 1 Spring 2003 Exam #4 (5) A thyroid patient was given a microcurie of radioactive technetium (half-life 6.0 hours) at 9:00 AM one morning. How many microcuries of activity was still in his body at 9:00 AM next morning? (a) (b) (c) (d) (e) (6) The half-life of 14C is 5570 years and living things in equilibrium with the atmosphere averaged 15.3 count/min. g of C. With which of the following eras would you associate an axe handle which had a 14C activity of 4.0 count/min. g? (a) (b) (c) (d) (e) (7) 1/16 1/4 1/8 0 6/9 Middle ages (1100 AD) Roman Era (200 BC) Age of the Pharaohs (3000 BC) Pre-history (9000 BC) Cave Man (30000 BC) Calculate the amount of energy (MeV) evolved in the fission of uranium-235 according to the equation: 235U 92 ------> 90Sr 38 + 144Ce 58 + 1n0 + 4 0e-1 nuclear masses in atomic mass units: 235U 92 90Sr 38 144Ce 58 1n 0 0e -1 234.9934 89.8864 143.8816 1.0087 0.00055 [conversion factor for E = mc2 is 931 MeV/amu] (a) (b) (c) (d) (e) CHE 116 146.5 MeV 286.4 MeV 59.3 MeV 199.8 MeV 309.1 MeV 2 Spring 2003 Exam #4 (8) The rate at which a radioactive nuclide decays depends upon (a) (b) (c) (d) (e) (9) The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm? (a) (b) (c) (d) (e) (10) (11) temperature pressure state of chemical combination all of the above none of the above 92.3 0.112 186 96.9 131 Radium undergoes alpha decay. The product of this reaction also undergoes alpha decay. What is the product of this second decay reaction? (a) Po (b) Rn (c) U (d) Th (e) Pa The missing product from the reaction shown below combines with oxygen to form a compound with the formula 42K 19 (a) (b) (c) (d) (e) (12) ------> 0e-1 + M2 O MO MO2 M2O3 M3O2 The reaction shown below is an example of 210Po 84 (a) (b) (c) (d) (e) CHE 116 ------> 206Pb 82 decay. + alpha beta gamma positron electron capture 3 Spring 2003 Exam #4 (13) Ozone is an important component in the Earth’s atmosphere that protects the surface from ultraviolet radiation. The chemical formula for ozone is (a) (b) (c) (d) (e) (14) Selenium is classified as a (a) (b) (c) (d) (e) (15) metal non-metal metalloid semi-metal superconductor What is the anhydride on H2SO4? (a) (b) (c) (d) (e) (16) O O2 O3 O4 H2O2 HSO3 SO4-2 SO3 SO2 S2O42- Give the IUPAC name for the compound shown below. H2 C H 3C H2 C CH H2 C C H2 CH3 OH (a) (b) (c) (d) (e) (17) 3-hexanal 5-heptanol 3-heptanal 3-heptanol 5-hexanol A straight chain alkyne has eight carbon atoms. Its molecular formula is (a) (b) (c) (d) (e) CHE 116 C8H8 C8H12 C8H14 C8H16 C8H18 4 Spring 2003 Exam #4 (18) Which is the correct structure for para-dihydroxybenzene? OH OH OH A C OH E OH OH OH OH OH D B OH (19) The structure of the male hormone, testosterone, is shown below. Testosterone contains CH 3 CH 3 OH H H H O (a) (b) (c) (d) (e) (20) The functional group of an alkene consists of (a) (b) (c) (d) (e) (21) an aldehyde and an alcohol a carboxylic acid and a ketone an ether and an amine an alcohol and a ketone an aldehyde and a ketone 2 bonds 1 bond and 1 bond 2 bonds 2 bonds and 1 bond 3 bonds The monomer used to make the following polymer, in the presence of an initiator peroxide (RO-O-R), is R O (CH2 CH)n O R CH3 (a) (b) CHE 116 CH2=C=CH2 CH3-CH3 5 Spring 2003 Exam #4 (c) (d) (e) (22) CH2=CHCH3 CH3CH2CH3 CH2=HCN Which one of the following structures is incorrect? H O H C O H A C C C O C H H B H Cl H O N C C H H H C C E H Br O H D CH3 A C OH B H3C C H2 C H2 C OH H3C C H2 CH3 H C OH CH3 D H2C OH E H C CH2 OH OH OH C H2 C H2 OH All of the following can exist in two or more isomeric forms (structural, geometric or optical) except (a) (b) (c) (d) (e) (25) Br Which one of the following alcohols is a tertiary alcohol? H3C (24) H C H H (23) H C H H H H H C4H10 C3H7Cl C2H2Cl2 C2HCl3 C3H6 The correct IUPAC name for the compound shown below is CH3 H 3C H C C H C H2 C H2 C H2 CH3 CH3 (a) (b) (c) (d) CHE 116 2,3-dimethylhexane 2,3-dimethylheptene 3,4-dimethylheptane 2,3-dimethylheptane 6 Spring 2003 Exam #4 (e) (26) 5,6-dimethylheptane The reaction represented by the following equation is called nC2H4 ------> (-C2H4-)n (a) (b) (c) (d) (e) (27) saponification esterification fermentation polymerization functionalization The polymerization of ethylene (C2H4) to form polyethylene occurs by a(n) (a) (b) (c) (d) (e) CHE 116 addition reaction. condensation reaction. copolymerization reaction. esterification reaction. transesterification reaction. 7 Spring 2003 Exam #4