# Exam 3[1] - View Attempt Page 1 of 7 Title: Started:...

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Title: Exam 3 Started: April 26, 2010 3:55 PM Submitted: April 26, 2010 5:14 PM Time spent: 01:18:50 Total score: 19/20 = 95% Total score adjusted by 0.0 Maximum possible score: 20 Done 1. At 25 o C the solubility of lead(II) sulfate is 1.26 x 10 -4 mol/L. Calculate the value of K sp at this temperature. Give your answer in scientific notation to 2 SIGNIFICANT FIGURES (even though this is strictly incorrect). Student Response Value Correct Answer 1. 1.6E-8 100% Equals 1.6e-8 (100%) Score: 1/1 2. What is the solubility of silver chromate (K sp = 1.8 x 10 -12 ) in a solution of 0.15 M silver nitrate? Student Response Value Correct Answer A. 2.0 x 10 -11 B. 1.2 x 10 -11 C. 1.3 x 10 -6 D. 7.7 x 10 -5 E. 8.0 x 10 -11 100% Score: 1/1 3. A solution is 0.10 M HgNO 3 and 0.20 M Pb(NO 3 ) 2 . If solid Na 2 CO 3 is added to the solution, what is [Pb 2+ ] when Hg 2 CO 3 begins to precipitate?(K sp PbCO 3 = 7.4 x 10 -14 ; Hg 2 CO 3 = 8.9 x 10 -6 ) Student Response Value Correct Answer A. 3.7 x 10 -13 B. 2.7 x 10 -7 C. 3.0 x 10 -3 D. 8.3 x 10 -11 100% E. 8.9 x 10 -4 Score: 1/1 Page 1 of 7 View Attempt 4/29/2010 https://learn.uh.edu/webct/urw/lc1129457039021.tp1129460016021/ViewStudentAttempt. ...

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4. Which of the following compounds will not have a different solubility with a change in pH? Student Response Value Correct Answer 1. AgF 0% 2. Ca 3 (PO 4 ) 2 3. SrCO 3 4. CuBr 5. CuS Score: 0/1 5. Which of the following processes has a negative value of delta S? Student Response Value Correct Answer A. AgF(s) Ag + (aq) + F - (aq) B. Ba(NO 3 ) 2 (s) + Na 2 S(s) BaS(s) + 2 NaNO 3 (s) C. C 6 H 6 (l) + 15/2 O 2 (g) 6 CO 2 (g) + 3 H 2 O(g) D. 2 NO 2 (g) N 2 O 4 (g) 100% E. CO(g) at 25 °C and 1 atm CO(g) at 50 °C and 1 atm Score: 1/1 6. For a certain reaction the standard free energy change is +40.0 kJ at 600 K and -40.0 kJ at
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## This note was uploaded on 11/22/2010 for the course CHEM 112 taught by Professor Bott during the Spring '10 term at University of Houston.

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Exam 3[1] - View Attempt Page 1 of 7 Title: Started:...

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