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Practice Exam I Practice Exam I 1
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1. The number of cubic nanometers in 1 km 3 is A. 10 –9 F. 10 12 B. 10 –18 G. 10 18 C. 10 –24 H. 10 24 D. 10 –27 I. 10 27 E. 10 9 J. 10 36 1 km 3 ( 1000 m km ) 3 10 9 nm m ) 3 ( = 10 9 x 10 27 = 10 36 nm 3 Practice Exam I 2
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• 2. The name of the compound Ba 3 N 2 is: • A. barium(II) nitride F. barium dinitrite • B. barium nitrite G. tribarium dinitride • C. barium(III) nitrite H. tribarium dinitrite D. barium nitride I. barium(III) nitride • E. barium(II) nitrite J. barium(III) dinitrite Practice Exam I 3
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3. What is the best answer to report for the following mathematical operation? [ ( (2.521)(13.51) ) / 2.78 ] + 0.31 = ? A. 12.561335 E. 12.56 B. 12.56134 F . 12.6 C. 12.5613 G. 13 D. 12.561 H. 1 x 10 1 (2.521)(13.51) 2.78 ) ( + 0.31 3-sf = 12.251335 + 0.31 = 12.561335 = 12.6 3-sf = 1 digit after decimal point Practice Exam I 4
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4. There are only two isotopes of lithium, lithium-6 and lithium-7, with atomic masses of 6.0151 amu and 7.0160 amu, respectively. The natural abundances of lithium-6 is A. 1% F . 8% B. 2% G. 10% C. 3% H. 12% D. 4% I. 14% E. 6% J. 16% X = Fractional Abundance 6.0151 x + (7.0160)(1 - x) = 6.94 -1.0009 x = -0.076 x = 0.08 or 8% Practice Exam I 5
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• 5. An oil has a density of 0.843 g/mL. A student pours 0.9720 g of this oil into a beaker that contains water. The diameter of the beaker, which has a circular base, is 17.39 cm. The student observes a layer of oil on the surface of the water. How thick is the layer of oil? • A. 0.00115 cm F. 0.0247 cm • B. 0.00256 cm G. 0.0352 cm C. 0.00486 cm H. 0.133 cm • D. 0.00734 cm I. 0.262 cm • E. 0.0165 cm J. 0.391 cm Practice Exam I 6 = V A = m / d r 2 = 0.9720 g / (0.843 g/cm 3 ) ( 17.39 / 2) 2 cm 2 = 1.153 cm 3 237.51 cm 2 = 0.00485 cm =
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6. Phosphorus has the molecular formula P 4 and sulfur has the molecular formula S 8 . How many grams of phosphorus contain the same number of molecules as 6.41 g of sulfur? A. 3.10 g F. 6.19 g B. 3.21 g G. 6.41 g C. 4.62 g H. 9.24 g D. 4.83 g I. 12.4 g E. 5.59 g J. 12.8 g Practice Exam I 7 M (P 4 ) = 30.97 g mol atoms P 4 atoms P molecule ( ) = 123.88 g mol P 4 M (S 8 ) = 32.06 g mol atoms S 8 atoms S molecule ( ) = 256.48 g mol S 8 6.41 g S 8 256.48 g mol S 8 ( ) = 0.02499 mol S 8 = 0.02499 mol P 4 123.88 g mol P 4 ( ) = 3.0960 = 3.10 g P 4 3-sf 3-sf
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• 7. Which one of the following contains the greatest total number of ions? • A.
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