Practice Exam 1 - CHM 2045(Mitchell only Exam 1(Form Code A...

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CHM 2045 (Mitchell only) Exam 1 (Form Code A) Summer 2009 Instructions: On your scantron sheet 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 sheet) and any other sheets. Turn in only the scantron. Check your bubbling – bubbling errors will not be negotiated . 1. An auto bumper is coated with a layer of chromium, 5.58 x 10 - 4 ft thick. The bumper has a surface area of 3.43 x 10 4 cm 2 . The density of chromium metal is 7.19 g/cm 3 . How many atoms of chromium are used in the coating? (1) 81 (2) 5.8 x10 2 (3) 4.2 x 10 3 (4) 4.9 x 10 25 (5) 2.5 x 10 27 2. If volumes are additive and 80.0 mL of 0.40 M sodium chloride is mixed with 200. mL of a calcium chloride solution to give a new solution in which [Cl -1 ] is 0.857 M, what is the concentration of the calcium chloride closest to that was used to make the new solution? 1) 0.20 M 2) 0.30 M 3) 0.40 M 4) 0.50 M 5) 0.60 M 3. If 0.250 moles of bromine and 0.600 moles of ammonia react according to the equation below, what is the maximum amount of ammonium bromide (in moles) produced? 3 Br 2 (l) + 8 NH 3 (g) 6 NH 4 Br(s) + N 2 (g) (1) 0.250 mol (2) 0.450 mol (3) 0.500 mol (4) 0.600 mol (5) 0.800 mol 4. Iron metal is produced in a blast furnace through a complex series of reactions that involve reduction of iron (III) oxide with carbon monoxide. Use the equations below to calculate rxn for the overall equation that form 1 mole of iron (III) oxide; (I) 3Fe 2 O 3 (s) + CO(g) 2 Fe 3 O 4 (s) + CO 2 (g) = -48.5 kJ (II) Fe(s) + CO 2 (g) FeO(s) + CO(g) = -11.0 kJ (III) Fe 3 O 4 (s) + CO(g) 3FeO(s) + CO 2 (g) = 22 kJ (1) -37.5 kJ (2) -15.5 kJ (3) 37.5 kJ (4) 17.5 kJ (5) 21 kJ 5. Which of the following listed pairs of atoms have the same number of neutrons?
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This note was uploaded on 09/25/2011 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Practice Exam 1 - CHM 2045(Mitchell only Exam 1(Form Code A...

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