Exam I Key - Chemistry 211 General Chemistry I Fall 2006...

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1 Chemistry 211 Name: KEY General Chemistry I Fall 2006 Score:_____________________ Exam I All questions must be answered on a Scantron form. Multiple choice questions are provided with answers a-e, and only one answer is correct. True or False questions are answered either as a (true) or b (false). You must sign the honor statement on the exam form below to receive credit for the exam. Turn your Scantron form in to correct envelope and the exam to the box in front of the classroom. The exam total is 100 points, with each question worth 100/32. I have abided by all aspects of the GMU honor code on this exam.__________________________________ signature (1). Determine the number of significant figures that are present in the set of figures below. What is the best answer for the four numbers? 35.00 0.00219 1.18 45000 Option 1 Option 2 Option 3 Option 4 Option 5 3 6 3 5 4 6 3 4 4 6 3 3 4 3 3 2 4 3 3 5 a. Option 1 b. Option 2 c. Option 3 d. Option 4 e. Option 5 (2). What is the mass % of Cl in KClO 3 ? mass % Cl = (35.453/122.549) x 100 = 28.9 a. 31.9% b. 39.2% c. 28.9% d. 55.6% e. 19.3% (3). A solution is a a. pure compound b. homogeneous mixture c. heterogeneous mixture d. pure mixture e. pure element (4). The measurements of three different masses on three different balances are 1.21 kg, 536 mg, and 23.14 g. The total mass should be reported as a. 1234 g b. 1.23 x 10 3 g c. 1233.7 g d. 1233.676 g e. 1233.68 g (5). Liquid hydrogen boils at –423°F. What is its boiling point on the Kelvin scale? K = 273 + (5/9 x (-423-32)) = 20 a. 20 K b. 30 K c. 126 K d. 426 K e. 526 K (6). The formula for copper(II) phosphate is a. Co 2 (PO 4 ) 3 b. Cu 3 (PO 4 ) 2 c. Cu 2 (PO 4 ) 3 d. CuPO 4 e. CoPO 4
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2 (7). A sample that cannot be separated into two or more substances by physical means is
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This note was uploaded on 07/08/2009 for the course CHEM 211 taught by Professor Papanastasiou during the Spring '07 term at George Mason.

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Exam I Key - Chemistry 211 General Chemistry I Fall 2006...

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