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How many unpaired electrons are present in the isolated carbon atom (atomic number = 6) ?


A) none
B) one
C) two
D) three
E) four

F) A) and B)
G) C) and E)

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What orbitals overlap to create the H-C bond in CH3+?


A) sp3-sp3
B) sp2-sp3
C) s-p
D) s-sp2
E) s-sp3

F) C) and E)
G) B) and E)

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What type of bonding is most important in CH3CH2CH2CH2CH2CH3?


A) ionic
B) hydrogen
C) covalent
D) polar

E) B) and D)
F) A) and C)

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Which of the following structures, including formal charges, is correct for diazomethane, CH2N2?


A) : CH2-N Which of the following structures, including formal charges, is correct for diazomethane, CH<sub>2</sub>N<sub>2</sub>? A) : CH<sub>2</sub>-N   N : B)    C)    D)    E)   N :
B) Which of the following structures, including formal charges, is correct for diazomethane, CH<sub>2</sub>N<sub>2</sub>? A) : CH<sub>2</sub>-N   N : B)    C)    D)    E)
C) Which of the following structures, including formal charges, is correct for diazomethane, CH<sub>2</sub>N<sub>2</sub>? A) : CH<sub>2</sub>-N   N : B)    C)    D)    E)
D) Which of the following structures, including formal charges, is correct for diazomethane, CH<sub>2</sub>N<sub>2</sub>? A) : CH<sub>2</sub>-N   N : B)    C)    D)    E)
E) Which of the following structures, including formal charges, is correct for diazomethane, CH<sub>2</sub>N<sub>2</sub>? A) : CH<sub>2</sub>-N   N : B)    C)    D)    E)

F) A) and B)
G) A) and C)

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Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond determines this?

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The compound methylamine, CH3NH2, contains a C-N bond. In this bond, which of the following best describes the charge on the nitrogen atom?


A) +1
B) slightly positive
C) uncharged
D) slightly negative
E) -1

F) A) and B)
G) B) and D)

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Which of the following is the most likely electronic structure for C2H2?


A) Which of the following is the most likely electronic structure for C<sub>2</sub>H<sub>2</sub>? A)    B)    C)    D)  H-C   C-H E)
B) Which of the following is the most likely electronic structure for C<sub>2</sub>H<sub>2</sub>? A)    B)    C)    D)  H-C   C-H E)
C) Which of the following is the most likely electronic structure for C<sub>2</sub>H<sub>2</sub>? A)    B)    C)    D)  H-C   C-H E)
D) H-C Which of the following is the most likely electronic structure for C<sub>2</sub>H<sub>2</sub>? A)    B)    C)    D)  H-C   C-H E)   C-H
E) Which of the following is the most likely electronic structure for C<sub>2</sub>H<sub>2</sub>? A)    B)    C)    D)  H-C   C-H E)

F) All of the above
G) C) and D)

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Identify the compound with the weakest bond.


A) H2
B) HF
C) HCl
D) HBr
E) HI

F) A) and E)
G) C) and D)

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Identify the least electronegative atom.


A) P
B) Na
C) I
D) B
E) O

F) C) and D)
G) All of the above

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Give the hybridization, shape, and bond angle for the carbon in CO2.

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Which of the following molecules has a net dipole moment of zero?


A) Which of the following molecules has a net dipole moment of zero? A)    B)    C)    D)    E)
B) Which of the following molecules has a net dipole moment of zero? A)    B)    C)    D)    E)
C) Which of the following molecules has a net dipole moment of zero? A)    B)    C)    D)    E)
D) Which of the following molecules has a net dipole moment of zero? A)    B)    C)    D)    E)
E) Which of the following molecules has a net dipole moment of zero? A)    B)    C)    D)    E)

F) B) and D)
G) D) and E)

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Which of the following molecules has the smallest dipole moment?


A) Br2
B) NH3
C) HCl
D) HBr
E) HI

F) C) and E)
G) A) and B)

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The Kekulé structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure. The Kekulé structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

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Which of the following is the electronic configuration of the element Fe?


A) 1s2 2s2 2p6 3s2 3p6 4s2 3d6
B) 1s2 2s2 2p6 3s2 3p8 3d6
C) 1s2 2s2 2p8 3s2 3p6 4s2 3d6
D) 1s2 2s2 2p6 3s2 3p6 4s2 4d6
E) 1s2 2s2 2p6 3s2 3p6 4s2 4p6

F) All of the above
G) B) and D)

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Draw the Kekulé structure for each of the following: a. CH3CH2OH b. CH3CHO c. (CH3)3C+

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Which of the following covalent bonds has the largest dipole moment?


A) C-C
B) C-H
C) C-O
D) H-N
E) H-F

F) B) and C)
G) None of the above

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How many distinct and degenerate p orbitals exist in the second electron shell, where n = 2?


A) 0
B) 1
C) 2
D) 3
E) 4

F) C) and E)
G) A) and D)

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Which of the compounds below have bonds that are predominantly ionic?


A) KCl
B) CF4
C) NH3
D) both A and B
E) both B and C

F) B) and C)
G) C) and D)

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Identify the hybridization of the nitrogen atom in the molecule (CH3)3N.

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The carbon-carbon double bond in ethene is ________ and ________ than the carbon-carbon triple bond in ethyne.


A) stronger; shorter
B) stronger; longer
C) weaker; shorter
D) weaker; longer
E) stronger; more polar

F) A) and D)
G) B) and C)

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