# 115exam1a - GENERAL CHEMISTRY 115 FIRST EXAM SPRING 2010...

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GENERAL CHEMISTRY 115 SPRING 2010 SECTION NO._______ FIRST EXAM NAME ____________________________ 1 inch = 2.54 cm; 1 mile = 1.609 km; 1L = 1.056 qt. Multiple choice = 4 points each Circle the best answer ?? 1. Express 18.56 square feet in square centimeters. a) 27237 cm 2 c) 5.256 x 10 5 cm 2 e) 8.597 x 10 3 cm 2 g) 1.724 x 10 4 cm 2 b) 5.986 x 10 4 cm 2 d) 3.655 x 10 4 cm 2 f) 5.66 x 10 2 cm 2 h) 5.735 x 10 4 cm 2 ?? 2. Perform the indicated mathematical operations and round off the answer to the proper number of significant figures: (0.825 – 0.215)/ (2.346 - 2.323)(6.35) = a) 4.17665 c) 4.177 e) 4.18 b) 4.176652 d) 4 f) 4.1 3. Below is a list of common prefixes used in the SI and metric systems. Fill in the appropriate blanks. Mega 10 +6 a) kilo- k _____ b) ______ 10 -9 c) milli- m _____ d) deci- d _____ 4. (8 pts) Fill the blanks in the following table. Cation Anion Formula Name Ca(NO 2 ) 2 Calcium nitride Al 3+ S 2- ?? ?? ?? 5. Which of the following numbers has 4 significant figures? a) 0.0065 c) 0.15837 e) 0.0563 g) 5.90 i) 0.048 b) 1.63980 d) 0.670909 f) 8.6090 h) 0.063010 j) 0.06798 6. The mileage rating of an automobile that is 12.0 kilometers per liter could also be expressed as ________ miles per gallon. a) 28.3 c) 23.5 e) 32.6 g) 25.3 i) 73.1 b) 31.6 d) 71.6 f) 32.0 h) 29.8 j) 33.8

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7. The mass of 1.74 moles of K 2 CO 3 is: a) 111 g c) 236 g e) 226 g g) 35.2 g i) 216 g b) 138 g d) 1.25 g f) 79.3 g h) 247 g j) 240 g ?? 8. Calculate the mass of one thousand oxygen atoms. a) 6.022 x 10 -23 g c) 1.600 x 10 -23 g e) 2.00 x 10 -17 g g) 7.985 x 10 23 g i) 2.00 x 10 -23 g b) 16.00 g d) 2.658 x 10 -20 g f) 1.600 x 10 6 g h) 4.810 x 10 -23 g j) 4.810 x 10 -22 g 9. An aluminum ore contains 33% aluminum oxide, Al 2 O 3 , plus other material that does not contain aluminum. How many kg of aluminum can be extracted from 2500 kg of this ore?
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115exam1a - GENERAL CHEMISTRY 115 FIRST EXAM SPRING 2010...

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