Chem103F04T1 - Chem103F04 Exam#13 ’ Name Section DO NOT...

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Unformatted text preview: Chem103F04 ' Exam #13 September 28, 2004 ’ Name Section DO NOT DETACH YOUR ANSWER SHEET FROM THE BACK OF THE EXAM Place your name and section number of the answer sheet at the end of the exam. For each question, mark the best answer on the answer sheet Mark only one answer for each question 1. Of the following, Which is the smallest mass? a) 25 kg b) 2.5 x 10'2 mg c) 2.5 x1015pg d) 2.5x 10‘2g e) 2.5x 10mng 2. Express the temperature, 422 K, in degrees Fahrenheit. a) 519 b) 300 c) 354 d) 324 e) 99 I 3. 1milligram= microgram a) 0.001 b) 1000 c) 0.01 d) 0.1 e) 10 4. The density of silver is 140.5 g/ cma. What volume (cm3) would be occupied by a piece of silver with a mass of 61.3 g? a) 0.171 / b) 644 c) 10.5 d) 0.00155 e) 5.84 5. What is the correct answer to the following? (754'58 + 3'50 “02) , 2.000 a) 552 b) 552.29 c) 552.3 d) 5.5x 102 e) 6x102 6. The atomic nucleus contains a) protons and electrons b) electrons and neutrons c) protons and neutrons d) only neutrons e) none of theses 7. Which of the following is an isotope of 3517X? ' a) 3517X -1 b) 3516X 0) 3717X d) 3718X e) 8537X 8. How many electrons, protons and neutrons are there in "ng ‘3 7 a) 38, 35, 42 b) 77, 32, 77 c) 32, so, 35 d) 77, 77, 35 e) 35, 35, 42 9. Aluminum ion has the formula? a) A1 ‘2 b) At3 c) A1 *2 d) Al *3 e) A1 10. Which of the following are the azide ion and the chromate ion? a) No3 "1 ; CrO " b) No3 '1 ; CrO4 '1 c) N03 ‘1 ; Cr04 ‘2 d) N: " ; Cro4 '2 e) N3 *1 ; CrO ‘1 11. Which of the following has the element name and symbol correctly matched? . a) P, potassium b) C, copper c) Mg, manganese (1) Ag, silver e) Sn, silicon 12. The chemical symbol for sodium is? a) S b) W c) So d) Na e) Sn 13. In the following list, which is NOT an example of a chemical reaction? a) dissolution of a penny in nitric acid b) the condensation of water vapor c) a burning candle d) the formation of polyethylene from ethylene e) the explosive reaction of hydrogen with oxygen to produce water 14. Which of the following is NOT an intensive property? a) density b) temperature c) melting point d) mass e) pressure 15. Intensive properties depend on the amount of matter present while Extensive properties depend on the amount of material present. a) do; sometimes b) do; don’t c) do; do - (1) don’t; do e) don’t; don’t 16. The average atomic weight of copper is 63.5. Copper has two naturally occurring isotopes. One of the isotopes has a mass of 62.9 amu and an abundance of 69. 1%. The other isotope has an abundance of 30.9 %. What is the atomic mass of this isotope? a) 63.2 b) 63.8 c) 64.1 d) 64.8 c) 28.1 17. How many S02 molecules are there in 11.52 grams of $02? a) 1.08 x 10 23 b) 6.02 x1024 0) 6.02 x1023 d) 1.08 x1024 e) 6.02 x1023 18. Which of the following is the expression of Boyle’s Law? a) PV = constant b) P/V = constant 0) WP = constant d) V/T = constant e) VT = constant 19. What is the volume of a balloon at a depth of 50 feet if its volume on the surface of the water was 2.84 L. Thirty feet of water equals on atmosphere. Assume constant temperature. a) 1.70 b) 4.74 c) 3.05 d) 0.939 e) 1.06 20. Which of the following is impossible for an ideal gas? a) (V1/ T1) = (V2/ T2) b) (V1 T1) = (V2 T2) 0) (V1/ V2) = (T1/ T2) d) (V2) = (T2/ T1) V1 6) (V1/ V2) = (T1/ T2) = 0 21. A gas originally at 27 °C and 1.00 atm occupied 3.9 L. If the flask is cooled at constant pressure until the temperature is 11 °C, what is the new volume of the gas? a) 0.27L b) 3.7L 0) 3.9L d) 4.1 L e) 0.24L 22. If 50.75 g of a gas occupies 10.0 L at STP, what volume will 129.3 g occupy ot STP? a) 3.92 L b) 50.8 L c) 12.9 L d) 25.5 L e) 5.08 L 23. What is the pressure exerted by 6.022 g of CH4 (M =16.05) in a 30.0 L vessel at129 °C? a) 0.414 atm b) 2.42 atm c) 6.62 atm d) 12.4 atm e) 22.4 atm 24. How many grams of N02 are contained in a 4.32 L flask at 48 °C and 1062 torr? a) 5.35 x 10 4 b) 53.5 c) 10.6 d) 70.5 e) 2.20 x10“1 25. According to kinetic molecular, which of the following gases will have the highest rms speed at 200 °C? a) HCl b) C]; c) H20 d) SF6 e) they will all be the same 26. The rms speed in m/ sec of CO at 113 °C is? a) 317 b) 58.3 c) 586 d) 993 e) 31.5 27. A sample of 02 gas was found to effuse at a rate equal to three times that of an unknown gas. What is the molar mass of the unknown gas in g/ mol? a) 288 b) 96 c) 55 d) 4 e) 10.7 28. Which of the following gases would deviate the least from ideal gas behavior? a) Ne b) CH3C1 c) Kr d) C02 e) CS2 29. The molar volume of a gas at S'I‘P is? . a) 0.0821 b) 62.4 c) 1.00 d) 14.7 e) 22.4 30. What is the density of NH3 (M = 17.0) in g/ L, in a 4.32 L container at 837 torr and 45 °C? a) 3.86 b) 0.717 c) 0.432 d) 0.194 e) 0.0422 31. Which of the following would have a density of 0.900 g/ L at STP? a) CH4 b) CO e) NO (1) Ne e) N2 32. A gas mixture of He, Ne and Ar has a total‘pressure of 8.40 atm. If the partial pressures of He and Ne are 1.50 atm and 2.00 atm respectively, what is the mole fraction of Ar in the mixture? a) 0.179 b) 0.238 c) 0.357 d) 0.417 e) 0.583 33. According to Kinetic molecular theory, molecules of different gases at th same temperature always have the same ? a) molecular mass b) pressure c) average kinetic energy d) volume e) average density 34. For a real gas the pressure is less than expected because of , while the volume is greater than expected because of a) attractive forces; attractive forces b) attractive forces; temperature changes 0) attractive forces; the finite volume of the molecules (1) volume effects; the finite volume of the molecules e) volume effects; temperature changes 35. Which of the following names/ accomplishment associations is incorrect? a) Thomson — charge to mass ration of an electron b) Millikan ~ mass of an electron c) Roentgen - discovered X-rays d) Chadwick — found and named neutrons e) Becquerel — discovered radioactivity 36. A gas company charges $1.30 for 15.0 113 of gas. What is the cost per liter of gas? 1 ft = 12 inches a) $ 000300 b) $0.300 c) $2.84 d) $00137 e) $1.04 37. Which is the correct set of names for the following ions? Cu +2 K+ ‘_ C3 +2 a) copper ion . potassium ion calcium ion b) cupric ion potassium ion calcium ion 0) copper(II) ion potassium(I) ion calcium(II) ion d) cuprous ion potassium ion calcium ion e) cupric ion potassium(I) ion calcium(II) ion 38. The specific nuclide on which all atomic masses are based is? a) hydrogen b) carbon . c) oxygen d) carbon— 12 e) oxygen— 16 39. How many atoms of Oxygen (O) are in 16.0 grams of 02 gas? a) 0.500 b) 3.01 x 10 23 c) 6.02 x 1023 d) 1.00 e) 16.0 40. At what temperature will the value on the Fahrenheit scale and the Celsius scale be the same? a) 0° b) 273° c) 40° d) -273° e) 40" 41. Which is the correct set of names for the following ions? CN“ so;2 c03-2 a) cyanide ion sulfate ion carbonate ion b) cyanate ion sulfate ion carbonate ion c) cyanide ion sulfite ion carbonite ion d) cyanate ion sulfite ion carbonate ion e) cyanide ion sulfite ion carbonate ion 42’. 150.0 mL of solution A with a density of ”1.045 g/ mL was mixed with 75.00 mL of solution B with a density of 1.750 g/mL. What is the density of the mixture? Assume the volumes are additive. a) 1.28 b) 1.280 c) 1.3 d) 0.7812 c) 0.781 43. Which of the following conversions is inexact? a) lin=2.54cm b) 1ft=12in c)lpound=484grams (1) 1m = 100 cm e) 1 stone =14 pounds 44. A gas, A, with a molar mass of 64.0 is released from one end of a tube 130 cm long. Simultaneously a gas, B with a molar mass of 4.0 is released from the other end of the tube. How for and from which end will the two gases first meet? a) 104 cm from the A end 'b) 26 cm from the B end 0) 26 cm from the A end (1) 32.5 cm from the A end e) 32.5 cm from th B end 45. What is the ratio of the rms speed of C02 to the rms speed of $02 at the same temperature? a) greater than 1 b) less than 1 ' 0) equal to 1 d) can not be determined from the information given 46. What is the ratio of the average kinetic energy of CO2 at 200 K to 802 at 200 K? a) greater than 1 ' b) less than 1 0) equal to 1 d) can not be determined from the information given 47. Which of the following speeds is the greatest? a) 40 miles/ hr b) 2.0 x 10 5mm/ min 0) 40 km/ hr d) 0.74 km/ min ‘ e) 400 m/ min 48. Three liquids of different densities are mixed. Because they are not miscible ( do not form homogeneous solutionswith one another) they form discrete layes, on on top of the other. List from bottom to top, the order of the layers. CCL4, d= 1.58 g/ mL; water, (1 = 1.00 g/ mL; Hg, d= 13.546 g / mL. a) H2 0 under CCl4 under Hg b) CCl4 under H20 under Hg c) CC14 under Hg under H20 d) H20 under Hg under CC14 e) Hg under CCl4 under H20 49. 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