Practice Final

Practice Final - General Chemistry I CHE 131 Final Exam...

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General Chemistry I CHE 131 Final Exam Summer 2009 #1. Which of the following statements is incorrect ? a) Chromatography is a physical method for separating mixtures. b) Distillation separates a mixture of liquids with different boiling points. c) Some heterogeneous mixtures can be separated by gravity filtration. d) A solution is a heterogeneous mixture with varying composition. e) All of the above statements are correct. #2. Which of the following statements is incorrect ? a) The law of constant proportion states a chemical compound always contains the same elements in the same proportions by mass. b) Modern Atomic theory describes a chemical reaction as the joining, separating or rearranging atoms. c) Dalton stated that each kind of atom must have its own properties, including a characteristic mass. d) The law of conservation of mass states that there is no detectable change in mass during an ordinary chemical reaction. e) All of the above statements are correct. #3. Which of the following statements is incorrect ? a) A cathode ray experiment was used to determine the mass to charge ratio of an electron. b) The Millikan oil drop experiment was used to determine the charge of an electron. c) Rutherford’s foil experiment proved that the nucleus contained protons. d) Chadwick’s experiments confirmed the presence of neutron in an atom. e) All of the above statements are correct. #4. Which of the following statements is incorrect? a) Sulfur is a member of the same group of oxygen whose atoms contains 34 electrons. b) Potassium is a member of the alkali metal group whose atoms contain 20 neutrons. c) Bromine is a halogen whose atoms contain 35 protons and 44 neutrons. d) Neon is a noble gas whose atoms contain 10 protons and 10 neutrons. e) All of the above statements are correct. #5. Which of the following compounds is expected to be ionic? a) methane b) dinitrogen pentoxide c) ammonium sulfide d) hydrogen selenide
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e) ammonia #6. How many sulfur atoms are present in a 21.0 g sample of Fe 2 (SO 4 ) 3 ? a) 3.16x10 22 atoms b) 9.49x10 22 atoms c) 1.13x10 23 atoms d) 3.80x10 23 atoms e) 7.20x10 23 atoms #7. Carbonic anhydrase, an important enzyme in mammalian respiration, is a large zinc- containing protein with a molar mass of 3.00x10 4 g/mol. The zinc is 0.218% by mass of the protein. How many zinc atoms does each carbonic anhydrase molecule contain? a)
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Practice Final - General Chemistry I CHE 131 Final Exam...

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