Practice Final 1332 View Attempt 3 of 5

Practice Final 1332 View Attempt 3 of 5 - View Attempt 3 of...

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View Attempt 3 of 5 Title: Practice Final Started: December 9, 2009 2:07 PM Submitted: December 9, 2009 3:54 PM Time spent: 01:47:23 Total score: 24/34 = 70.59% Total score adjusted by 0.0 Maximum possible score: 34 1. What is the solubility in moles/liter for copper(II) iodate at 25 o C given a K sp value of 1.4 x 10 -7 . Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!) Student Response Value Correct Answer 1. 3.3E-3 100% Equals 3.27e-3 (100%) Equals 3.3e-3 (100%) General Feedback: K sp = 4S 3 Score: 1/1 2. A precipitate of lead(II)chloride forms when 140.0 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate. True or False? K sp of PbCl 2 is 1.7 x 10 -5 . Student Response Value Correct Answer Feedback 1. True 0% 2. False 100% Score: 1/1
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3. Which of the following compounds will not have a different solubility with a change in pH? Student Response Value Correct Answer Feedback 1. AgF 0% 2. Ca 3 (PO 4 ) 2 0% 3. SrCO 3 0% 4. CuBr 100% 5. CuS 0% Score: 1/1 4. S for the following process is positive. True or false? Gasoline vapors mixing with air in a car engine. Student Response Value Correct Answer Feedback 1. True 100% 2. False 0% Score: 1/1 5. Given the values of G f o given below in kJ/mol, calculate the value of G o in kJ for the combustion of 1 mole of propane to form carbon dioxide and liquid water. G f o (C 3 H 8 (g)) = -22.7
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G f o (CO 2 (g)) = -393.9 G f o (H 2 O(l)) = -239.2 Student Response Value Correct Answer Answer -2161.2 0% -2,116 Score: 0/1 6. The value of G o for the reaction, N 2 (g) + 3 H 2 (g) <=> 2 NH 3 (g) is -32.90 kJ at 298 K. Calculate the value of G in kJ at 298 K if the partial pressures of N 2 , H 2 and NH 3 are 0.868, 7.390, and 7.042 atm respectively. Student Response Value Correct Answer Answer -42.34 0% -37.7 Score: 0/1 7. Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water. MnO 4 - (aq) + H 2 C 2 O 4 (aq) Mn 2+ (aq) + CO 2 (g) Student Response Value Correct Answer Feedback 1. 1 0% 2. 6 0% 3. 2 0% 4. 3 0%
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5. 8 100% Score: 1/1 8. Calculate the pH when 5.01 g of CH 3 COONa is added to 300.4 mL of 0.50 M acetic acid, CH 3 COOH. Ignore any changes in volume. The K a value for CH 3 COOH is 1.8 x 10 -5 . Student Response Value Correct Answer Answer 4.35 100% 4.35 Score: 1/1 9. Calculate the pH during the titration of 31.1 mL of 0.610 M ethylamine, (C 2 H 5 )NH 2 with 0.251 M HCl after 14.3 mL of the acid have been added. K
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Practice Final 1332 View Attempt 3 of 5 - View Attempt 3 of...

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