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How many of the following: F2, B2, O2, N2 , are paramagnetic? (Points: 5)
How many of the following: F2, B2, O2, N2 , are paramagnetic?



1. 3

2. 0

3. 1

4. 2

5. 4


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2. For which of the following diatomic molecules would the bond order become greater if an electron is removed (i.e., if the molecule is converted to the positive ion in its ground state)? (Points: 5)
For which of the following diatomic molecules would the bond order become greater if an electron is removed (i.e., if the molecule is converted to the positive ion in its ground state)?



1. P2


2. C2


3. F2


4. Na2


5. B2



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3. Atomic solids generally have low melting points. (Points: 5)
Atomic solids generally have low melting points.



1. False

2. True


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4. The hybridization of Cl in ClF2+ is (Points: 5)
The hybridization of Cl in ClF2+ is



1. sp2


2. sp

3. dsp3


4. d2sp3


5. sp3



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5. The bond order for CN– is 2. (Points: 5)
The bond order for CN– is 2.



1. False

2. True


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6. Larger bond order means greater bond strength. (Points: 5)
Larger bond order means greater bond strength.



1. True

2. False


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7. Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in g/cm3? (Points: 5)
Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in g/cm3?



1. 2.76

2. 3.59

3. 7.18

4. 5.52

5. 14.4


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8. Sulfur trioxide is known to be planar with all the oxygen atoms equidistant from the central sulfur atom. On the basis of these facts, which of the following conclusions may be drawn concerning this molecule? (Points: 5)
Sulfur trioxide is known to be planar with all the oxygen atoms equidistant from the central sulfur atom. On the basis of these facts, which of the following conclusions may be drawn concerning this molecule?
I. It can be represented by three equivalent resonance structures.
II. The dipoles associated with each S–O bond are equal in magnitude.
III. The sulfur atom is sp2 hybridized.



1. II only

2. III only

3. I only

4. I, II, and III

5. I and II only


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9. Which of the following statements are incorrect concerning drawing III? (Points: 5)
Consider the representations below to answer the next three questions.
(I)


(II)


(III)

Reference: Ref 10-2

Which of the following statements are incorrect concerning drawing III?



1. Two of the above statements are incorrect.

2. These molecules exhibit ionic bonding.

3. Electrostatic interactions exist between the molecules.

4. The molecules find the best compromise between attraction and repulsion.

5. OCS exhibits this type of interaction.


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10. For how many of the following does bond order decrease if you take away one electron from the neutral molecule? (Points: 5)
For how many of the following does bond order decrease if you take away one electron from the neutral molecule?
B2, C2, P2, F2




1. 0

2. 3

3. 4

4. 1

5. 2


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11. Choose the correct statement about the diagram below. (Points: 5)
Choose the correct statement about the diagram below.




1. The diagram could represent the phase diagram of CO2.

2. None of the above statements is correct.

3. The diagram shows the triple point above 1 atm pressure.

4. The diagram is qualitatively correct for water.

5. The diagram shows that the melting point of the solid increases with increasing pressure.


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12. Which of the following is paired incorrectly? (Points: 5)
Which of the following is paired incorrectly?



1. unit cell—the smallest repeating unit of the lattice

2. glass—amorphous solid

3. amorphous solids—considerable disorder in their structures

4. gold metal—simple cubic unit cell

5. crystalline solids—highly regular arrangement of their components


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13. Below is a phase diagram for compound Q. You wish to purify a sample of Q that was collected at P = 1.0 atm and T = 100 K by subliming it. In order to sublime the sample, you should: (Points: 5)
Below is a phase diagram for compound Q. You wish to purify a sample of Q that was collected at P = 1.0 atm and T = 100 K by subliming it. In order to sublime the sample, you should:




1. Increase P to 1.5 atm and then increase T to 300 K.

2. Lower P to 0.5 atm and then increase T to 200 K.

3. Increase T to 300 K, keeping P = 1.0 atm.

4. Abandon the attempt to sublime Q.

5. Increase T to 300 K and then lower P to 0.5 atm.


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14. Assume 12,500 J of energy is added to 2.0 moles (36 grams) of H2O as an ice sample at 0°C. The molar heat of fusion is 6.02 kJ/mol. The specific heat of liquid water is 4.18 J/g °C. The molar heat of vaporization is 40.6 kJ/mol. The resulting sample contai (Points: 5)
Assume 12,500 J of energy is added to 2.0 moles (36 grams) of H2O as an ice sample at 0°C. The molar heat of fusion is 6.02 kJ/mol. The specific heat of liquid water is 4.18 J/g °C. The molar heat of vaporization is 40.6 kJ/mol. The resulting sample contains which of the following?



1. ice and water

2. only water vapor

3. only ice

4. water and water vapor

5. only water


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15. Which of the following processes must exist in equilibrium with the evaporation process when a measurement of vapor pressure is made? (Points: 5)
Which of the following processes must exist in equilibrium with the evaporation process when a measurement of vapor pressure is made?



1. vaporization

2. condensation

3. boiling

4. fusion

5. sublimation


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16. If a molecule demonstrates paramagnetism, then : (Points: 5)
If a molecule demonstrates paramagnetism, then : I. The substance can have both paired and unpaired electrons.
II. The bond order is not a whole number.
III. It can be determined by drawing a Lewis structure.
IV. It must be an ion.






1. All of the above are correct.

2. I, II, IV

3. I only

4. II, III

5. I, II


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17. At normal atmospheric pressure and a temperature of 0°C, which phase(s) of H2O can exist? (Points: 5)
At normal atmospheric pressure and a temperature of 0°C, which phase(s) of H2O can exist?



1. water only

2. ice and water

3. water vapor only

4. ice and water vapor

5. ice only


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18. How many sigma and pi bonds are in the molecule? (Points: 5)
Tetracyanoethylene has the skeleton shown below:

From its Lewis structure determine the following:
Reference: Ref 9-2

How many sigma and pi bonds are in the molecule?



1. 9 sigma and 9 pi

2. 9 sigma and 8 pi

3. 5 sigma and 8 pi

4. 6 sigma and 8 pi

5. 4 sigma and 5 pi


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19. Which of the following has the highest melting temperature? (Points: 5)
Which of the following has the highest melting temperature?



1. CO2


2. S8


3. P4


4. MgF2


5. H2O


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20. The configuration (σ2s)2(σ2s*)2(π2py)1(π2px)1 is the molecular orbital description for the ground state of (Points: 5)
The configuration (σ2s)2(σ2s*)2(π2py)1(π2px)1 is the molecular orbital description for the ground state of



1. B22–


2. Be2


3. Li2+


4. B2


5. C2



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How many of the following: F2, B2, O2, N2 , are paramagnetic? (Points: 5)
How many of the following: F2, B2, O2, N2 , are paramagnetic?

1. 3
2. 0
3. 1
4. 2
5. 4
Save Answer
2. For which of the...