Page 1278 - Chemistry--atom first

1268 Answer Key
45. (a) 7.04 102; (b) 3.344 10−2; (c) 5.479 102; (d) 2.2086 104; (e) 1.00000 103; (f) 6.51 10−8; (g) 7.157 10−3
47. (a) exact; (b) exact; (c) uncertain; (d) exact; (e) uncertain; (f) uncertain 49. (a) two; (b) three; (c) five; (d) four; (e) six; (f) two; (g) five
51. (a) 0.44; (b) 9.0; (c) 27; (d) 140; (e) 1.5 10−3; (f) 0.44
53. (a) 2.15 105; (b) 4.2 106; (c) 2.08; (d) 0.19; (e) 27,440; (f) 43.0 55. (a) Archer X; (b) Archer W; (c) Archer Y
57. (a) ; (b) ; (c)

59.

Only two significant figures are justified. 61. 68–71 cm; 400–450 g
63. 355 mL
65.8 10−4 cm
67. yes; weight = 89.4 kg 69.5.0 10−3 mL
71. (a) 1.3 10−4 kg; (b) 2.32 108 kg; (c) 5.23 10−12 m; (d) 8.63 10−5 kg; (e) 3.76 10−1 m; (f) 5.4 10−5 m; (g) 1 1012 s; (h) 2.7 10−11 s; (i) 1.5 10−4 K
73. 45.4 L 75.1.0160 103 kg
77. (a) 394 ft (b) 5.9634 km (c) 6.0 102 (d) 2.64 L
(e) 5.1 1018 kg (f) 14.5 kg
(g) 324 mg
79. 0.46 m; 1.5 ft/cubit
81. Yes, the acid's volume is 123 mL.
83. 62.6 in (about 5 ft 3 in.) and 101 lb
85.(a) 3.81 cm 8.89 cm 2.44 m; (b) 40.6 cm 87. 2.70 g/cm3
89. (a) 81.6 g; (b) 17.6 g
91. (a) 5.1 mL; (b) 37 L
93. 5371 °F, 3239 K
95. −23 °C, 250 K
97. −33.4 °C, 239.8 K
99. 113 °F
Chapter 2
1. The starting materials consist of one green sphere and two purple spheres. The products consist of two green spheres and two purple spheres. This violates Dalton’s postulate that that atoms are not created during a chemical change, but are merely redistributed.
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