Practice_Exam_1

# Practice_Exam_1 - C105 Practice Exam 1 (You should take...

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C105 Practice Exam 1 (You should take this practice exam under real exam conditions, i.e. close-book, close- notes, with time limit, without any outside help. Simply memorizing how to do each problem on the practice exam without understanding of the concepts will not help you get ready for the actual exam. The actual exam 1 will contain 40 multiple choice questions.) 1. When the equation below is properly balanced, what is the coefficient of barium chloride (BaCl 2 )? AlCl 3 (aq) + Ba 3 (PO 4 ) 2 (aq) ± AlPO 4 (s) + BaCl 2 (aq) A. 2 B. 3 C. 4 D. 6 2. When the equation below is properly balanced, what is the sum of all the coefficients? Al(NO 3 ) 3 + H 2 SO 4 ± Al 2 (SO 4 ) 3 + HNO 3 A. 6 B. 9 C. 11 D. 12 3. Cr in nature is a mixture of four isotopes Mass Natural Abundance 49.946 4.35% 51.941 83.79% 52.941 9.50% 53.939 2.36% Calculate the (average) atomic mass of Cr. A. 49.94 B. 50.00 C. 51.32 D. 52.00 E. 53.17 4. Which of the following matched pairs of name and formula has an error? A. Potassium hypochlorite, KClO B. Copper(II) oxide, Cu 2 O C. Tetraantimony hexaoxide, Sb 4 O 6 D. Acetic acid, CH 3 COOH 5. Which gas does not exist as a diatomic molecule at room temperature? A. oxygen B. nitrogen C. chlorine D. neon E. hydrogen

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The answer to the following calculation, rounded to the correct significant figures, is (33.41)/(1.123+9.2) A. 3.236 B. 3 C. 3.2 D. 3.24 7. A combination of sand, salt, and water is an example of a A. homogeneous mixture. B. heterogeneous mixture. C. compound. D. pure substance. 8. If 5.76 x 10 13 neon atoms (spherical) were laid in a straight line, each touching the next, the line would measure 2.54 miles. What is the diameter of a neon atom in Å? (1 Å = 1.0 x 10 -1 nm; 1 mile = 1.6093 km) A. 0.62 B. 0.71 C. 0.92 D. 1.44 9. An unknown element X has a pre-superscript of 81 and a pre-subscript of 34. How many neutrons does it contain and what is its identity? A. selenium and 47 neutrons B. selenium and 81 neutrons C. thallium and 34 neutrons D. thallium and 34 neutrons E. rubidium and 34 neutrons 10. If an unknown element X forms the sulfide, X 2 S, the formula for the phosphate of the element would be A. XPO 4 B. X(PO 4 ) 2 C. X 2 PO 4 D. X 3 PO 4 11. Express 39.34 yd 2 in cm 2 given that 1 m = 1.0936 yd A. 0.6417 B. 1.728 x 10 4 C. 1.835 x 10 5 D. 3.289 x 10 5 E. 7.632 x 10 6 12. Which one of the following is incorrectly written? A. CaCO
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## This note was uploaded on 05/05/2010 for the course BIO 101 taught by Professor Vaughan during the Spring '10 term at IUPUI.

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Practice_Exam_1 - C105 Practice Exam 1 (You should take...

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