Chem 1515 General General Chemistry Test 1 (Koknat)

Chem 1515 General General Chemistry Test 1 (Koknat) -...

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Unformatted text preview: Version B YOUNGSTOWN STATE UNIVERSITY Department of Chemistry Chemistry 1515 First Exam Fall, 2006 PLEASE NOTE : 50 minutes will be allowed for this exam. Use your time wisely. Get on the scoreboard early by answering the easy questions first. Maximum score for this exam is 100 points. There are 30 multiple choice questions, each worth 3.33 points. You may use your calculator. However, programmable calculators and cell phones are not permitted. If a question does not seem to be clearly formulated, please feel free to raise your hand and ask questions. Please use the backs of the pages as scratch paper. There is only one "best" answer for each multiple choice question. Whenever possible use the scratch paper to work out a solution for a problem before you make your choice. Please try to answer all questions. There is no extra penalty for wrong answers. 1A 2A PERIODIC TABLE. OF THE ELEMENTS 3A 4A 5A . 6A 7A 8A 1 2 H He 1.008 4.003 7 8 9 10 N O F Ne 6. 941 9. 012 10. 81 12. 01 14. 01 16. 00 19.00 20.18 11 12 ' 13 14 16 17 13 Na Mg Si 22. 99 24 1 38 4B 13 28 26"M 98 28. 09. 30. P97 32. 507 35 45 39. 95 19 20 21 22 23 24 25 26 27 28 29 30 31 35 36 Sc Ti C1: Fe Co Ni Br 3.9 K10 40.08 44. 96 47. 87 50.94 52.00 54. 94 55.85 58. 93 58. 69 63. 55 65. 41 69. 72 72. 64 74. 92 73s 96 79. 90 83.80 37 38 39 40 41 42 44 45 46 47 48 49 54 Sr Zr Mo Ag InB Xe 85. 47 87.62 88. Y91 91 22 92. 91 95. 94 (98) 101.1 102. 9 106. 4 107.9 112. 4 114.8118.7 121b B 127. 6 126. 9 131. 3 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs La" Hf Ta Ir Au Tl Bi Po At 132. 9 131E533 138. 9 178. 5 180. 9 183.8 186. 2 190. 2 192. 2 195.1 197. 0 200. g6 204. 4 207. 2 209.0 (209) (—210) (222) 87 88 104 105 106 107 108 109 110 111 112 114 116 Acif 2(23) 2(26) (227) (261) (262) (266) (264) (277) (268) (281) (272) (285) (292) macs 53 62 63 64 65 66 67 68 69 70 71 Tb Ho Er Lu 140.1 140. 9 144. d2 (145) 150. 4 152.0 157. 3 158. 9 162.5 164. 9 167. 3 168. 9 173.0 175.0 90 91 92 93 94 95 96 100 101 102 103 Th Pa N?) 232.0 231 0 238.0 (23 (244) (243) 2(47) (2437) (251) (252) (257) (258) (259) (262) " LANI‘HANIDE SERIES # ACTINIDE SERIES *B* CIRCLE THE BEST ANSWER. LATER, TRANSFER ANSWERS TO SCANTRON SHEET *B* 01. A summary of what is consistently observed in nature is called a a) hypothesis b) theory c) qualitative observation 6) scientific law 02. Isotopes are atoms of the same element with a) different atomic numbers b) different numbers of protons C) different numbers of neutrons d) different numbers of electrons e) the same mass number 03. The radioactive isotope cobalt-S7 is used in medicine. How many protons, neutrons, and electrons are contained in a neutral atom of cobalt—57? a) 30 p, 57 n, 30 e b) 30 p, 27 n, 30 (a 27 p, 30 n, 27 d} 27 p, 57 n, 27 e) 57 p, 27 n, 57 00mm 04. Which element has been assigned an INCORRECT symbol? (:) boron - Br b} mercury — Hg c) magnesium - Mg d) gold - Au e) iron - Fe 149.1 b) 121.1 c) 113.0 d) 110.0 e) 61.99 (fig. The formula weight (FW) of ammonium phosphate, (NH4)3PO4, is 06. What is the percentage by weight of nitrogen in ammonium phosphate, (NH4)3PO4 ? ' a) 37.29% 28.19% c) 22.60% d) 12.40% e) 9.397% 07. what is the simplest or empirical formula for a compound that contains 62.04 wt% C, 10.41 wt% H, and 27.55 wt% 0 ? a) CHO b) CH20 c) CH3O d) C2H60 C3H50 08. A compound with a molecular weight of 92 has the empirical formula N02. Its molecular formula is ' a) N306 b) N404 © “2% d) N402 e) N202 09. Ammonia, NH3, is an important fertilizer. How many moles of ammonia, NHB, are there in a 68 g sample of NH3? a) 0.25 :50 4.0 c) 17 d) 1.5 x 1023 e) 2.4 x 1024 10. How many molecules of NH3 are there in a 68 g sample of NH3? a) 4.0 b) 17 c) 68 d) 1.5 x 1023 (E) 2.4 x 1024 c7316 + H 02 ---> 7 co2 + (3 H20 11. When the above equation is properly balanced with the smallest whole number coefficients, the coefficient for O2 is a) 4 b) 7 c) 8 <5} 11 e) 15 Fe304 + 4 CO ---> 3 Fe + 4 CO2 12. How many moles of C0 are required to obtain 1.20 moles of Fe? {3) 4.80 b) 1.60 c) 0.900 d) 0.400 e) 0.360 Fe304 + 4 C0 —~—> 3 Fe + 4 C02 13. How many grams of iron can be obtained from 46.3 g of Fe304 (FW 231.5) ? a) 139 g Fe304 + 4 CO —--> 3 Fe + 4 C02 14. How many grams of C02 (FW 44.0) are obtained when 1.50 moles of Fe are formed? a) 16.5 b) 22.0 c) 44.0 0% 88.0 e) 198 15. When a 84.76 9 sample of a metal is placed in a graduated cylinder that already contains 14.4 mL of water, the water rises to the 24.6 mL mark. The density of the submerged metal in g/cm3 is a} 0.290 b) 2.17 c) 3.45 d) 5.88 (f) 8.31 16. Mercury is the only metallic element that is a liquid at room temperature. Its density is 13.6 g/mL. A 6.80 9 sample of mercury would occupy a volume of @D 0.500 mL h) 2.00 mL c) 6.30 mL d) 20.4 mL e) 92.5 mL 17. The number of significant digits in the measurement 0.0050 m is O U'lIdehJH 18. Expressed to the correct number of significant digits, 62.7 x 0.068 the result for the calculation to the right should be ------------- a) 0.1145 51.0 x 0.7295 b) 0.1146 03) 0.11 ) 0.12 e) 0.1 19. Expressed to the correct number of significant digits, (104 - 98.4) x 1.50 would be a) 8 ® d) e) .4 .40 LDKDWCO .0 20. Rounded to three significant digits, 587661 is best expressed as a) 587 b) 588 c) 537000 d) 5.37 x 105 5.33 x 105 21. Expressed in regular notation, 6.1374 x 10'3 would be a) 0.000061374 b) 0.00061374 (E) 0.0061374 ") 613.74 e) 6137.4 22. A vitamin supplement tablet contains 35 micrograms of biotin. Converted to milligrams, that would be a) 35 000 000 mg 7b) 35 000 mg C) 0.035 mg d) 0.000 035 mg e) 0.000 000 035 mg 23. One liter equals 1.06 quarts, and one quart contains 32 fluid ounces. A 12.0 ounce can of soda pop contains how many milliliters? a) 407 Q?» 393 c) 375 d) 362 e) 354 @3353 24. The gas tank of an automobile holds 75 liters or 75 dm3 of fuel. Converted to cubic meters, this would be a) 0.075 m3 QED 0.75 m3 c) 7.5 m3 d) 750 m3 e) 75000 m3 25. Glycerol (also known as glycerine) is a viscous liquid that is sweet, non-toxic, and infinitely soluble in water. It is used not only as a moistening agent in cosmetics, skin creams, lotions, tobacco, and food, but also in the manufacture of nitroglycerine. Pure glycerol freezes at 19°C. This temperature corresponds to a) 292 K and 28°F b) 292 K and 65°F c) 292 K and -7.2°F d) 254 K and 28°F K and 66°F 26. Which anion has been assigned an incorrect name? a) CO3" - carbonate ion b) N03" - nitrate ion (3 SO4-- - sulfide ion d) CN' - cyanide ion e) Cl’ - chloride ion 27. The correct formula for the ionic compound lithium oxide is c) Li202 d) LiO2 e) L130 28. Which compound has been assigned an incorrect name? éib NH4HCO3 - ammonium carbonate b) SnO - tintII) oxide c) FeF3 - iron(III) fluoride d) NaC2H3O2 - sodium acetate e) K2304 — potassium sulfate 29. which compound has been given an incorrect name? a) PF5 - phosphorus pentafluoride b) SCl4 — sulfur tetrachloride c) PBr3 - phosphorus tribromide 69 C120 — chlorine dioxide e) $2Cl2 — disulfur dichloride 30. which acid has been assigned an incorrect name? a) H2804 - hydrosulfuric acid (E) HClO4 - perchloric acid c) HCN - hydrocyanic acid d) H3PO4 — phosphoric acid e) HN02 — nitrous acid INDIVIDUAL STUDENT ANSHERS OCTOBER 09, 2006 SCORE = 24.00 2; RIGHT ’EZHRONGx 0 UNANSHERED 1.05 16.A 31. 46. 61. 76. 91. 106. 121. 136. 2.0 17.0 32. 47. 62. 77. 92. 107. 122. 137. 3.0 10.0 33. 4a. 63. 7a. 93. 100. 123. 13a. 4.A 19.04 34. 49. 64. 79. 94. 109. 124. 139. 5.A 20.5 35. 50. 65. an. 95. 110. 125. 140. 6.3 21.0 36. 51. 66. a1. 96. 111. 126. 141. 7.E 22.0 37. 52. 67. 02. 97. 112. 127. 142. 3.0 23,34 30. 53. 68. 03. 9a. 113. 120. 143. 9.0 24.0%L 39. 54. 69. a4. 99. 114. 129. 144. 10.5 25.5% 40. 55. 70. as. 100. 115. 130. 145. 11.0 26.0 41. 56. 71. 86. 101. 116. 131. 146. 12.4! 27.0 42. 57. 72. 07. 102. 117. 132. 147. 13.0 28.A 43. 58. 73. as. 103. 113. 133. 143. 14.0 29.0 44. 59. 74. 09. 104. 119. 134. 149. 15.E 30.3! 45. 60. 75. 90. 105. 120. 135. 150. ...
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