Practice Test 1
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- Words: 1,353
- Pages: 8
View Attempt
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
View Attempt 1 of 2 Title:
Practice Test 1
Started:
September 28, 2009 2:55 AM
Submitted:
September 28, 2009 2:56 AM
Time spent:
00:00:59
Total score: 0/20 = 0% 1.
Total score adjusted by 0.0
Maximum possible score: 20
IMF in solution 58 What is the strongest form of intermolecular force between solute and solvent in a solution of C4H10(g) in C7H16(l)?
Student Value Response
Correct Answer Feedback
1. ion-dipole 0% 2. dipoledipole
0%
3. hydrogen 0% bonding 4. dipoleinduced dipole
0%
5. dispersion 100% Score:
2.
0/1
Relative Solubility 42 Which of the following is less soluble in hexane, ethanol or CH3Cl(l). Don't try to type the subscripts, just use letters and numbers.
Student Response 1. not answered Score:
3.
Value
Correct Answer
0%
Equals ethanol (100%)
0/1
Chapter 8 Molality 7 Determine the molality of a solution prepared by dissolving 8.20 g of cycloheptane in 81.3 g of benzene.
Student Response Answer not answered Score:
1 of 8
Value
Correct Answer
0%
1.03
0/1
28-Sep-09 2:58 AM
View Attempt
2 of 8
4.
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Chapter 8 MF to molal 7 Determine the molality of a solution of water dissolved in ethanol for which the mole fraction of water is 0.30.
Student Response Answer not answered Score:
5.
Value
Correct Answer
0%
9.32
0/1
Ionic Dissociation Calculation 2 How many moles of solute particles are present in 1.00 mL of 0.442 M K3PO4? Use scientific notation with 3 significant figures!!!!
Student Response Answer not answered Score:
6.
Value
Correct Answer
0%
1.77E-3 (1.77 × 10-3)
0/1
General Properties Comparison 3 Consider the solutions, 0.04 m urea [(NH2)2C=O)], 0.04 m AgNO3 and 0.04 m CaCl2. Which has (i) the highest osmotic pressure, (ii) the highest vapor pressure, (iii) the highest boiling point?
Student Value Response 1. (a) 0.04 m CaCl2 (b) 0.04 m CaCl2 (c) 0.04 m CaCl2
0%
2. (a) 0.04 m CaCl2 (b) 0.04 m urea (c) 0.04 m CaCl2
100%
3. (a) 0.04 m urea (b) 0.04 m CaCl2 (c) 0.04 m urea
0%
Correct Answer Feedback
28-Sep-09 2:58 AM
View Attempt
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
4. (a) 0.04 m CaCl2 (b) 0.04 m urea (c) 0.04 m urea
100%
5. all will be the same
0%
Score:
7.
0/1
Chapter 8 VP 1 Calculate the vapor pressure (in torr) at 293 K in a solution prepared by dissolving 30.1 g of the non-volatile non-electrolye sucrose in 129 g of water. The vapor pressure of water at 293 K is 17.54 torr.
Student Response Answer not answered Score:
8.
Value
Correct Answer
0%
17.33
0/1
Chapter 8 BP 5 Calculate the boiling point (in degrees C) of a solution made by dissolving 1.32 g of ethylene glycol(HOC2H4OH) in 70.0 g of water. The Kbp of the solvent is 0.512 K/m and the normal boiling point is 373 K.
Student Response Answer not answered Score:
9.
Value
Correct Answer
0%
100.156
0/1
Chapter 8 MM bp 6 When 6.6 g of an unknown non-electrolyte is dissolved in 50.0 g of water, the boiling point increased to 100.805 degrees C from 100 degrees C. If the Kbp of the solvent is 0.512 K/m, calculate the molar mass of the unknown solute.
Student Response Answer not answered Score:
3 of 8
Value
Correct Answer
0%
84
0/1
28-Sep-09 2:58 AM
View Attempt
4 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
10. Calculate k from Rate Law 34 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, the reaction is [second] order in A, [first] order in B, [first] order in C and [fourth] order overall. USE WORDS TO FILL IN THE BLANKS NOT NUMBERS (i.e., zero, first, second etc) !!!!! : Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
8 x 10-3
3
0.3
0.4
0.4
3.6 x 10-2
4
0.4
0.6
0.2
4.8 x 10-2
Calculate the value of k to 3 significant figures.
Student Response 1. not answered Score:
Value
Correct Answer
0%
Equals 2.50 (100%)
0/1
11. Determine Rate Law 5 Consider the reaction of A(g) + B(g) + C(g) => D(g) for which the following data were obtained: Experiment
Initial [A], mol/L Initial [B], mol/L Initial [C], mol/L Initial rate, mol/L.s
1
0.0500
0.0500
0.0100
6.25 x 10-3
2
0.100
0.0500
0.0100
1.25 x 10-2
3
0.100
0.100
0.0100
2.50 x 10-2
4
0.0500
0.0500
0.0200
6.25 x 10-3
What is the rate law for the reaction?
Student Response 1. rate = k[A][B][C]
Value
Correct Answer
Feedback
0%
0% 2. rate = 2 2 k[A] [B] [C] 3. rate = 0% 2 k[A] [B][C] 4. rate = k[A]2[B]2
0%
5. rate = k[A][B]
100%
28-Sep-09 2:58 AM
View Attempt
5 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Score:
0/1
12. IRL 1 t 8 A reaction has a rate constant of 0.00507 sec-1, how long will it take (in minutes) until 0.493 mol/L of the compound is left, if there was 0.744 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer not answered Score:
Value
Correct Answer
0%
1.353
0/1
13. IRL 1 c 4 A reaction has a rate constant of 0.00482 sec-1, how much of the compound (in mol/L) is left after 7.39 sec, if there was 0.868 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer not answered Score:
Value
Correct Answer
0%
0.838
0/1
14. Known Rate Law, Change Conc 7 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is halved? Just put in the number as a whole number or fraction.
Student Response 1. not answered
Score:
Value
Correct Answer
0%
Equals 0.5 (100%) Equals 1/2 (100%) Equals .5 (100%)
0/1
15. Known Rate Law, Change Conc 29 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is quadrupled and that of Br- is quadrupled? Just put in the number as a whole number or fraction.
28-Sep-09 2:58 AM
View Attempt
6 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Student Response 1. not answered
Score:
Value
Correct Answer
0%
Equals 16 (100%) Equals 16/1 (100%)
0/1
16. Chapter 5 IMF 48 Which type of intermolecular force ("interparticle force") is the most important in PF3(l)?
Student Value Response
Correct Answer Feedback
1. London 0% Dispersion 2. Dipoledipole forces
100%
3. Ion-dipole 0% forces 4. Hydrogen 0% bonds 5. Ionic bonds Score:
0%
0/1
17. Chapter 5 IMF 69 Which type of intermolecular force ("interparticle force") is the most important in NaCl(aq)?
Student Value Response
Correct Answer Feedback
1. London 0% Dispersion 2. Dipoledipole forces
0%
3. Ion-dipole 100% forces 4. Hydrogen 0% bonds 5. Ionic bonds
0%
28-Sep-09 2:58 AM
View Attempt
7 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Score:
0/1
18. Chapter 5 Phys Props 49 Which of the following substances has the lowest heat of vaporization?
Student Value Response 1. NH3
0%
2. PH3
100%
3. AsH3
0%
4. SbH3
0%
Score:
Correct Answer Feedback
0/1
19. Chapter 5 Phys Props 21 Which of the following substances would be expected to have the highest melting point?
Student Value Response
Correct Answer Feedback
1. methane 0% 2. SiH4
0%
3. SnH4
0%
4. GeH4
0%
5. PbH4
100%
Score:
0/1
20. Phase Change enthalpies 2 What is the heat change in J associated with 20.3 g of liquid water at 5.00 ° C changing to solid water at -5.00 °C? c(H2 O) (liq) = 4.184 J/(g.K) c(H2O) (s) = 2.09 J/ (g.K) DHfus(H2 O) = 6.02 kJ/mol Enter your answer in scientific format with TWO DECIMAL PLACES (that is, 3 significant figures total): 1.23X104 =1.23E4. Do not include units. You will not get credit for the question if you do not use the correct format!!!
28-Sep-09 2:58 AM
View Attempt
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Student Response Answer not answered Score:
Value
Correct Answer
0%
-7.42E3 (-7.42 × 103)
0/1
Done
8 of 8
28-Sep-09 2:58 AM
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
View Attempt 1 of 2 Title:
Practice Test 1
Started:
September 28, 2009 2:55 AM
Submitted:
September 28, 2009 2:56 AM
Time spent:
00:00:59
Total score: 0/20 = 0% 1.
Total score adjusted by 0.0
Maximum possible score: 20
IMF in solution 58 What is the strongest form of intermolecular force between solute and solvent in a solution of C4H10(g) in C7H16(l)?
Student Value Response
Correct Answer Feedback
1. ion-dipole 0% 2. dipoledipole
0%
3. hydrogen 0% bonding 4. dipoleinduced dipole
0%
5. dispersion 100% Score:
2.
0/1
Relative Solubility 42 Which of the following is less soluble in hexane, ethanol or CH3Cl(l). Don't try to type the subscripts, just use letters and numbers.
Student Response 1. not answered Score:
3.
Value
Correct Answer
0%
Equals ethanol (100%)
0/1
Chapter 8 Molality 7 Determine the molality of a solution prepared by dissolving 8.20 g of cycloheptane in 81.3 g of benzene.
Student Response Answer not answered Score:
1 of 8
Value
Correct Answer
0%
1.03
0/1
28-Sep-09 2:58 AM
View Attempt
2 of 8
4.
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Chapter 8 MF to molal 7 Determine the molality of a solution of water dissolved in ethanol for which the mole fraction of water is 0.30.
Student Response Answer not answered Score:
5.
Value
Correct Answer
0%
9.32
0/1
Ionic Dissociation Calculation 2 How many moles of solute particles are present in 1.00 mL of 0.442 M K3PO4? Use scientific notation with 3 significant figures!!!!
Student Response Answer not answered Score:
6.
Value
Correct Answer
0%
1.77E-3 (1.77 × 10-3)
0/1
General Properties Comparison 3 Consider the solutions, 0.04 m urea [(NH2)2C=O)], 0.04 m AgNO3 and 0.04 m CaCl2. Which has (i) the highest osmotic pressure, (ii) the highest vapor pressure, (iii) the highest boiling point?
Student Value Response 1. (a) 0.04 m CaCl2 (b) 0.04 m CaCl2 (c) 0.04 m CaCl2
0%
2. (a) 0.04 m CaCl2 (b) 0.04 m urea (c) 0.04 m CaCl2
100%
3. (a) 0.04 m urea (b) 0.04 m CaCl2 (c) 0.04 m urea
0%
Correct Answer Feedback
28-Sep-09 2:58 AM
View Attempt
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
4. (a) 0.04 m CaCl2 (b) 0.04 m urea (c) 0.04 m urea
100%
5. all will be the same
0%
Score:
7.
0/1
Chapter 8 VP 1 Calculate the vapor pressure (in torr) at 293 K in a solution prepared by dissolving 30.1 g of the non-volatile non-electrolye sucrose in 129 g of water. The vapor pressure of water at 293 K is 17.54 torr.
Student Response Answer not answered Score:
8.
Value
Correct Answer
0%
17.33
0/1
Chapter 8 BP 5 Calculate the boiling point (in degrees C) of a solution made by dissolving 1.32 g of ethylene glycol(HOC2H4OH) in 70.0 g of water. The Kbp of the solvent is 0.512 K/m and the normal boiling point is 373 K.
Student Response Answer not answered Score:
9.
Value
Correct Answer
0%
100.156
0/1
Chapter 8 MM bp 6 When 6.6 g of an unknown non-electrolyte is dissolved in 50.0 g of water, the boiling point increased to 100.805 degrees C from 100 degrees C. If the Kbp of the solvent is 0.512 K/m, calculate the molar mass of the unknown solute.
Student Response Answer not answered Score:
3 of 8
Value
Correct Answer
0%
84
0/1
28-Sep-09 2:58 AM
View Attempt
4 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
10. Calculate k from Rate Law 34 Given the data below for the reaction, 2 A + 2 B + 4 C => D + E + 3 F, the reaction is [second] order in A, [first] order in B, [first] order in C and [fourth] order overall. USE WORDS TO FILL IN THE BLANKS NOT NUMBERS (i.e., zero, first, second etc) !!!!! : Experiment
Initial conc of A, mol/L
Initial conc of B, mol/L
Initial conc of C, mol/L
Initial rate, mol/L.s
1
0.1
0.2
0.4
2 x 10-3
2
0.2
0.2
0.4
8 x 10-3
3
0.3
0.4
0.4
3.6 x 10-2
4
0.4
0.6
0.2
4.8 x 10-2
Calculate the value of k to 3 significant figures.
Student Response 1. not answered Score:
Value
Correct Answer
0%
Equals 2.50 (100%)
0/1
11. Determine Rate Law 5 Consider the reaction of A(g) + B(g) + C(g) => D(g) for which the following data were obtained: Experiment
Initial [A], mol/L Initial [B], mol/L Initial [C], mol/L Initial rate, mol/L.s
1
0.0500
0.0500
0.0100
6.25 x 10-3
2
0.100
0.0500
0.0100
1.25 x 10-2
3
0.100
0.100
0.0100
2.50 x 10-2
4
0.0500
0.0500
0.0200
6.25 x 10-3
What is the rate law for the reaction?
Student Response 1. rate = k[A][B][C]
Value
Correct Answer
Feedback
0%
0% 2. rate = 2 2 k[A] [B] [C] 3. rate = 0% 2 k[A] [B][C] 4. rate = k[A]2[B]2
0%
5. rate = k[A][B]
100%
28-Sep-09 2:58 AM
View Attempt
5 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Score:
0/1
12. IRL 1 t 8 A reaction has a rate constant of 0.00507 sec-1, how long will it take (in minutes) until 0.493 mol/L of the compound is left, if there was 0.744 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer not answered Score:
Value
Correct Answer
0%
1.353
0/1
13. IRL 1 c 4 A reaction has a rate constant of 0.00482 sec-1, how much of the compound (in mol/L) is left after 7.39 sec, if there was 0.868 mol/L at the start? (give answer to 3 sig figs using E notation)?
Student Response Answer not answered Score:
Value
Correct Answer
0%
0.838
0/1
14. Known Rate Law, Change Conc 7 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is halved? Just put in the number as a whole number or fraction.
Student Response 1. not answered
Score:
Value
Correct Answer
0%
Equals 0.5 (100%) Equals 1/2 (100%) Equals .5 (100%)
0/1
15. Known Rate Law, Change Conc 29 Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]2 By what factor does the rate change if the concentration of BrO3- is quadrupled and that of Br- is quadrupled? Just put in the number as a whole number or fraction.
28-Sep-09 2:58 AM
View Attempt
6 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Student Response 1. not answered
Score:
Value
Correct Answer
0%
Equals 16 (100%) Equals 16/1 (100%)
0/1
16. Chapter 5 IMF 48 Which type of intermolecular force ("interparticle force") is the most important in PF3(l)?
Student Value Response
Correct Answer Feedback
1. London 0% Dispersion 2. Dipoledipole forces
100%
3. Ion-dipole 0% forces 4. Hydrogen 0% bonds 5. Ionic bonds Score:
0%
0/1
17. Chapter 5 IMF 69 Which type of intermolecular force ("interparticle force") is the most important in NaCl(aq)?
Student Value Response
Correct Answer Feedback
1. London 0% Dispersion 2. Dipoledipole forces
0%
3. Ion-dipole 100% forces 4. Hydrogen 0% bonds 5. Ionic bonds
0%
28-Sep-09 2:58 AM
View Attempt
7 of 8
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Score:
0/1
18. Chapter 5 Phys Props 49 Which of the following substances has the lowest heat of vaporization?
Student Value Response 1. NH3
0%
2. PH3
100%
3. AsH3
0%
4. SbH3
0%
Score:
Correct Answer Feedback
0/1
19. Chapter 5 Phys Props 21 Which of the following substances would be expected to have the highest melting point?
Student Value Response
Correct Answer Feedback
1. methane 0% 2. SiH4
0%
3. SnH4
0%
4. GeH4
0%
5. PbH4
100%
Score:
0/1
20. Phase Change enthalpies 2 What is the heat change in J associated with 20.3 g of liquid water at 5.00 ° C changing to solid water at -5.00 °C? c(H2 O) (liq) = 4.184 J/(g.K) c(H2O) (s) = 2.09 J/ (g.K) DHfus(H2 O) = 6.02 kJ/mol Enter your answer in scientific format with TWO DECIMAL PLACES (that is, 3 significant figures total): 1.23X104 =1.23E4. Do not include units. You will not get credit for the question if you do not use the correct format!!!
28-Sep-09 2:58 AM
View Attempt
https://scholar.uh.edu/webct/ViewStudentAttempt.dowebct?attempt=1768...
Student Response Answer not answered Score:
Value
Correct Answer
0%
-7.42E3 (-7.42 × 103)
0/1
Done
8 of 8
28-Sep-09 2:58 AM
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