Old Exam 2 - CHM 2046 Gower Sections Exam 2(Form Code A)...

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CHM 2046 Gower Sections Exam 2 (Form Code A) Fall 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). Bubbling errors will not be negotiated . Note: A double-arrow symbol used in this exam ( ↔) refers to a reversible reaction. Potentially Useful Information: R = 0.0821 lit•atm/mol•K and 8.314 J/mol•K 1. What type of redox reaction is the following? Ni(s) + Pb(NO 3 ) 2 (aq) Pb(s) + Ni(NO 3 ) 2 (aq) (1) combination (2) decomposition (3) displacement (4) disproportionation (5) precipitation 2. The oxidation number/state of an atom signifies the charge that the atom would have in a compound if: (1) electrons were transferred completely (and not merely shared) (2) the sum of the charges on the atoms in the compound equalled zero (3) the compound was dissolved in aqueous solution (4) the Z eff was equal for every electron (5) the number of bonding electrons equalled the number of nonbonding electrons 3. Any spontaneous process must lead to: (1) an increase in the entropy of the system (2) an increase in the entropy of the surroundings (3) a decrease in the entropy of the surroundings (4) a net increase in the entropy of the universe (5) a net decrease in the entropy of the universe 4. Under which conditions will a process be spontaneous (have a negative Δ G ) at all temperatures? (1) endothermic and a positive Δ S (2) endothermic and a negative Δ S (3) exothermic and Δ S = 0 (4) exothermic and a positive Δ S (5) exothermic and a negative Δ S (two possible correct answers) 5. Calculate the molar solubility of CaF 2 . ( K sp = 4.0 x 10 –11 ) (1) 2.2 x 10 –4 M (2) 6.3 x 10 –6 M (3) 3.4 x 10 –4 M (4) 1.3 x 10 –11 M (5) 4.0 x 10 –11 M 6. How many grams of CaCO 3 will dissolve in 3.0 x 10 2 mL of 0.050 M Ca(NO 3 ) 2 ? ( K sp of CaCO 3 = 8.7 x 10 –9 ) (1) 2.8 x 10 –3 g (2) 5.1 x 10 –3 g (3) 5.1 x 10 –6 g (4) 2.8 x 10 –6 g (5) 7.4 x 10 –3 g 7. Which of the following ionic compounds will not have a greater solubility in acidic solution than in pure water? (1)
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This note was uploaded on 01/25/2011 for the course CHM 2046 taught by Professor Veige/martin during the Fall '07 term at University of Florida.

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Old Exam 2 - CHM 2046 Gower Sections Exam 2(Form Code A)...

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