Exam 1 fall 11 chm 2045 final version form a w out ans

Exam 1 Fall 11 CHM 2045 final version Form A w out ans
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CHM 2045 Exam 1 (Gower, Mitchell, Williams) (Form Code A) Fall 2011 Instructions: This exam contains 25 questions worth 10 points each. On your Scantron form enter and bubble in your name , UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above). You may retain your exam sheet (mark your answers on it and the Scantron) and any other sheets. Turn in only your Scantron. Check your bubbling carefully – minus 9 points for bubbling errors, non-negotiable . 1. If you mix 250. mL 1.0 M KCl with 375. mL 2.5 M KCl, what is the molarity of KCl in the final solution? (1) 0.4 M (2) 1.9 M (3) 1.2 M (4) 1.6 M (5) 2.4 M 2. Which choice(s) contain(s) both ionic and covalent bonds? I. H 3 O + II. Mg(OH) 2 III. SF 6 IV. Na 2 O V. K 2 CO 3 (1) I only (2) I & II only (3) I & III only (4) II & V only (5) I & V only 3. Which choice is correctly classified ? (1) chromium, main group element (2) ammonia, ionic compound (3) xenon, monatomic gas (4) hydride, polyatomic anion (5) butane, homogeneous mixture 4. A mixture of copper(II) sulfate pentahydrate (249.70 g/mol) and magnesium sulfate heptahydrate (246.49 g/mol) is heated until all the water is lost. The weight of the initial mixture is 5.020 g, and the weight of the resulting anydrous compounds is 2.988 g. Which choice is closest to the percent by mass of copper(II) sulfate pentahydrate in the original mixture? (1) 40.48% (2) 50.32% (3) 59.52% (4) 53.54% (5) 70.86% 5. A 500. mL sample of 2.00 M HCl solution is treated with 4.47 g of magnesium. Calculate the concentration of the acid solution after all the metal has reacted. Assume that the volume remains unchanged. (The products of this reaction are magnesium chloride and hydrogen gas.) (1) 1.63 M (2) 1.26 M (3) 0.632 M (4) 0.368 M (5) 0.184 M 6. Consider the reaction MnO 2 (s) + 4HCl(aq) MnCl 2 (aq) + Cl 2 (g) + 2H 2 O( l ). If 74.8 g MnO
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