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Chemistry 116: General Chemistry Syracuse University Project Advance Exam #4, Spring 2007 Name Date 1) If a constant current of 5.0 amperes is passed through a cell containing Cr3+ for 1.0 hour, how many grams of Cr will plate onto the cathode? a) b) c) d) e) 0.054 g 1.5 g 3.2 g 9.7 g 93 g 2) Alpha particles are a) extremely penetrating light quanta b) electrons from the nucleus c) electrons from outside the nucleus d) helium molecules e) helium +2 ions 3) 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) Some hydrogen atoms are heavier than others b) The difference is the binding energy of the helium nucleus c) The difference is the experimental error in the measurement of the masses d) Because free neutrons have a very brief existence, we can not measure their mass directly and must use and average value that doesn’t fit every individual case accurately. e) Since there is nothing in common between the helium atom and the hydrogen atom, there is no reason to expect the agreement. CHE 116 1 Spring 2007 Exam #4 4) Which fundamental particle is a product of the following nuclear reaction: 45 Sc21 + 4 He2 48 Ti22 + ? a) deuteron b) positron c) proton d) neutron e) electron 5) Choose the incorrect statement concerning gamma rays a) They have no mass b) They have no charge c) They have no energy d) They are emitted by nuclei e) They move with the velocity of light 6) The following reaction is an example of 2 H + 2H 3He + 1n + energy a) a nuclear fission reaction b) a breeder reaction c) a nuclear voltaic reaction d) a nuclear fusion reaction e) none of these 7) The half life of 14C is 5570 years and living things in equilibrium with the atmosphere averaged 15.3 counts/min. g of C. With which of the following eras would you associate an axe handle which had a 14C activity of 4.0 counts/min. g ? a) Middle ages (1100 AD) b) Roman Era (200 BC) c) Age of the Pharaohs (3000 BC) d) Pre-history (9000BC) e) Cave Man (30000 BC) 8) 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 CHE 116 2 Spring 2007 Exam #4 9) Calculate the amount of energy (MeV) evolved in the fission of uranium-235 according to the equation: 235 U92 90 Sr38 + 144 Cs58 + 1n0 + 40e-1 Nuclear masses are in atomic mass units: 235 U92 234.9934 Sr38 89.8864 144 Cs58 143.8816 1 n0 1.0087 0 e-1 0.00055 (Conversion factor for E=mc2 is 931 MeV/amu) 90 a) 146.5 MeV b) 286.4 MeV c) 59.3 MeV d) 199.8 MeV e) 309.1 MeV 10) Which of the following compounds contains carbon atoms with sp2hybrid atomic orbitals? a) propyne b) propene c) propane d) propanol e) none of the above 11) Arrange the following three substances in order of increasing solubility in hexane (C6H14): A) CH2OHCH2OH B) C10H22 C) H2O a) ABC b) ACB c) CAB d) BCA e) BAC 12) A straight chain alkyne has eight carbon atoms. Its molecular formula is a) C8H8 b) C8H12 c) C8H14 d) C8H16 e) C8H18 CHE 116 3 Spring 2007 Exam #4 13) Which of the following alcohols is a tertiary alcohol? a) b) c) HOCH2CH2OH d) CH3CH2CH2OH e) 14) Which is the correct structure for para-dihydroxybenzene? OH OH OH A C OH E OH OH OH OH OH D B OH 15) The functional group of an alkene consists of a) 2 bonds b) 1 and 1 bond c) 2 bonds d) 2 and 1 bond e) 3 bonds CHE 116 4 Spring 2007 Exam #4 16) Geometric isomerism is usually found in a) b) c) d) e) aldehydes. alkanes. alkynes. alkenes. alcohols. 17) The following compound has which functional groups? O O H3C a) b) c) d) e) C H2 N H CH3 ether and amine ester and amide ether and amide ester and amine alcohol and ketone 18) How many H atoms are needed to complete the following alkane structure? C C C a) b) c) d) e) C C 6 8 9 10 12 19) Which functional group most commonly undergoes addition reactions? a) b) c) d) e) alkyne alcohol ester amine aromatic ring CHE 116 5 Spring 2007 Exam #4 20) What is the IUPAC name for the following compound? H3C CH2 H C H2C a) b) c) d) e) CH C H2 CH3 4-ethyl-1-pentene 2-ethyl-4-pentene 4-methyl-1-hexene 3-methyl-5-hexene 2-(2-propenyl)butane 21) Which one of the following structures is incorrect? H O H C O H A H C C Cl H C O H C H H B H H C C H H H H H H O N C C H H H C C E H Br O H Br D 22) The monomer unit for polyvinylchloride (PVC), used in pipes for plumbing, is vinyl chloride. H H C H C Cl What is the formula for the repeating unit of this polymer? (a) (b) H H C C Cl H Cl C C H Cl H H C C C C H Cl Cl Cl H Cl C C Cl (d) (e) (c) CHE 116 6 Spring 2007 Exam #4