Chem II TESTS - View Attempt 1 of 11

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iew Attempt http://scholar.uh.edu/webct/urw/lc227395331.tp227395645/ViewStudentAttempt.dowebct?att. .. of 11 10/7/2008 9:33 AM View Attempt 1 of 1 Title: Exam 1 Started: October 1, 2008 6:28 PM Submitted: October 1, 2008 7:36 PM Time spent: 01:08:37 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 1. What is the strongest form of intermolecular force between solute and solvent in a solution of C 2 H 6 (g) in benzene, C 6 H 6 (l)? Student Response Value Correct Answer Feedback 1. ion-dipole 0% 2. dipole-dipole 0% 3. hydrogen bonding 0% 4. dipole-induced dipole 0% 5.dispersion 100% Score: 1/1 2. Which of the following is more soluble in water, CaCO 3 (s) or NaCl(s). Don't try to type the subscripts, just use letters and numbers. Student Response Value Correct Answer 1. NaCl 100% Equals NaCl(s) (100%) Equals NaCl (100%) Equals sodium chloride (100%) Score: 1/1
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iew Attempt http://scholar.uh.edu/webct/urw/lc227395331.tp227395645/ViewStudentAttempt.dowebct?att. .. of 11 10/7/2008 9:33 AM 3. Calculate the molarity of an aqueous solution that is 15.6% by mass calcium chloride. You might need to know that the density is 1.16 g/mL. Student Response Value Correct Answer Feedback a.1.63 100% b. 2.40 0% c. 0.163 0% d. 1.405 0% e. 2.07 0% Score: 1/1 4. 4How many moles of solute particles are present in 2.14 mL of 0.702 M NH 4 NO 3 ? Use scientific notation with 3 significant figures!!!! Student Response Value Correct Answer Answer 3.00E-3 100% 3.00E-3 (3.00 × 10 -3 ) Score: 1/1 5. Which of the following aqueous solutions will have the highest vapor pressure? Student Response Value Correct Answer Feedback a. 0.100 m K 3 PO 4 0%
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iew Attempt http://scholar.uh.edu/webct/urw/lc227395331.tp227395645/ViewStudentAttempt.dowebct?att. .. of 11 10/7/2008 9:33 AM b. 0.100 m CaCl 2 0% c. 0.100 m NaCl 0% d. 0.100 m glucose (C 6 H 12 O 6 ) 100% e. All have the same molality so all will have the same value. 0% Score: 1/1 6. Calculate the boiling point (in degrees C) of a solution made by dissolving 2.13 g of anthracene{C 14 H 10 } in 85.0 g of cyclohexane. The K bp of the solvent is 2.79 K/m and the normal boiling point is 80.7 degrees C. Student Response Value Correct Answer Answer 81.09226247 100% 81.09 Score: 1/1 7. When 1.87 g of an unknown non-electrolyte is dissolved in 50.0 g of cyclohexane, the freezing point decreased to 3.38 degrees C from 6.5 degrees C. If the K fp of the solvent is 20.1 K/m, calculate the molar mass of the unknown solute. Student Response Value Correct Answer Answer 240.9423077 100% 241
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iew Attempt http://scholar.uh.edu/webct/urw/lc227395331.tp227395645/ViewStudentAttempt.dowebct?att. .. of 11 10/7/2008 9:33 AM Score: 1/1 8. H 2 Z is a nonvolatile, water-soluble substance. When 6.15 x 10 -3 mol of H 2 Z is dissolved in 50.0 g of water (K fp = 1.86 o C/m), the freezing point of the resulting solution is –0.46 o C. Choose the equation that best describes the dissolution of H 2 Z. I. H
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This note was uploaded on 11/25/2011 for the course CHEM 318 taught by Professor Rankin during the Spring '11 term at University of Texas at Austin.

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Chem II TESTS - View Attempt 1 of 11

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