Chem 1332 Sample Question

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Exams 1
1.| |
| Which type of intermolecular/interparticle force exists in all solid substances? | |
| Student Response| Value| Correct Answer| Feedback|
A. | Ionic| | | |
B. | Dipole-dipole| | | |
C. | Hydrogen bonding| 0% | | |
D. | None - there are different types of IMF/IPF depending on the substance| | | | E. | London Dispersion| | | |
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Score:| 0/1 |
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1.| |
| We add 1000 J of heat to a 20.0-g sample of liquid carbon tetrachloride (CCl4) at 50.0°C. What mass of CCl4 will vaporize at its boiling point of 76.7°C? For liquid CCl4, specific heat capacity = 0.862 J/g.K and ΔHvap = 194 J/g. | |

| Student Response| Value| Correct Answer| Feedback|
A. | 4.44 g| | | |
B. | 5.15 g| | | |
C. | 17.2 g| | | |
D. | 2.78 g| | | |
E. | 20.0 g| | | |
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Score:| 0/1 |
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An automobile antifreeze is made using equal volumes of ethylene glycol (d = 1.114 g/mL; MM = 62.07 g/mol) and water (d = 1.00 g/mL) at 25°C. The solution has a density of 1.06 g/mL. What is the molarity of ethylene glycol in the solution? | |

| Student Response| Value| Correct Answer| Feedback|
A. | 4.50| | | |
B. | 0.323| 0% | | |
C. | 5.68| | | |
D. | 8.97| | | |
E. | 9.00| | | |
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Score:| 0/1 |
1 Which type of intermolecular/interparticle force exists in all solid substances? | |
| Student Response| Value| Correct Answer| Feedback|
A. | Ionic| | | |
B. | Hydrogen bonding| | | |
C. | Dipole-dipole| | | |
D. | London Dispersion| | | |
E. | None - there are different types of IMF/IPF depending on the substance| | | |
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1.| |
| How much energy in J is needed to convert 52 g of liquid ethanol at 65 oC to vapor at 95oC. You might need to know that: mp = -114 oC and bp = 78oC
The heat of fusion is 4.6 kJ/mol and the heat of vaporization is 46.0 kJ/mol. Finally, the specific heats of the solid, liquid and gas are, respectively 2.1, 3.2 and 1.8 J/g oC. | |
| Student Response| Value| Correct Answer| Feedback|
A. | 56200| | | |
B. | 8950| | | |
C. | 2,396,000| | | |
D. | 55750| | | |
E. | 3750| | | |
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Score:| 0/1 |
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2.| |
| Which of the following substances would be expected to have the highest melting point? | |
| Student Response| Value| Correct Answer| Feedback|
A. | HOCH2CH2OH| 100% | | |
B. | CH3CH2CH2CH2CH3| | | |
C. | CH3CH2OH| | | |
D. | CH3CH2CH2OH| | | |
E. | CH3OCH3| | | |
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Score:| 1/1 |
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2.| |
| The rate law for the reaction 3A => 2B is rate = k[A] with a rate constant of 0.0447 hr-1. What is the half-life of the reaction in hours? | |
| Student Response| Value| Correct Answer| Feedback|
1. | 0.0645| | | |
2. | 44.7| | | |
3. | 0.0224| | | |
4. | 15.5| | | |
5. | Cannot answer without knowing the initial concentration.| | | |
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Score:| 0/1 |
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2) The rate law of a particular reaction is found to be, rate = k[A]2[B]. Which of the following statements is FALSE? | |
| Student Response| Value| Correct Answer| Feedback|
A. | Tripling the concentration of A will result in a nine-fold increase in the rate.| | | | B. | The actual value of k will depend on the temperature| 0% | | | C. | The reaction is third order overall. | | | |

D. | The units of k could be (L2/mol2 sec) | | | |
E. | The actual value of k will depend on the concentrations of A and B.| | | |
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Score:| 0/1 |
2.| |
| Which of the following substances would be expected to have the highest melting point? | |
| Student Response| Value| Correct Answer| Feedback|
A. | CH3CH2CH2OH| | | |
B. | CH3CH2CH2CH2CH3| | | |
C. | HOCH2CH2OH| | | |
D. | CH3CH2OH| | | |
E. |...
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