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Which bond in the following molecule is the shortest? Which bond in the following molecule is the shortest? A) bond 1 B) bond 2 C) bond 3 D) bond 4 E) bond 5


A) bond 1
B) bond 2
C) bond 3
D) bond 4
E) bond 5

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E

Ar,K+,Cl- are isoelectronic elements (elements with the same number of electrons).What orbital does the last electron occupy?

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Draw the shape of a 2p orbital.

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Determine the number of pi bonds in CH3CN.


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

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Draw condensed structures for the four compounds with formula C3H9N.

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CH3CH2CH2NH2 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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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

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Which of the following molecules has the smallest dipole moment?


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

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Draw a Lewis structure for the molecule given and show all formal charges. CH2CO

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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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Using the symbol δ+ and δ-,show the direction of the polarity in the indicated bond. Using the symbol δ+ and δ-,show the direction of the polarity in the indicated bond.

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11ea8a1c_2c5f_9396_b657_dfc244e9ba29_TB1831_00

Identify the least electronegative atom.


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

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Give the number of nonbonding lone pairs of electrons in H2NOH.


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

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What is the CNN bond angle in the compound shown below? What is the CNN bond angle in the compound shown below? A) ~60° B) ~90° C) ~110° D) ~120° E) ~180°


A) ~60°
B) ~90°
C) ~110°
D) ~120°
E) ~180°

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Why is the C-H bond in ethene (H2C Why is the C-H bond in ethene (H<sub>2</sub>C CH<sub>2</sub>)shorter and stronger than the C-H bond in ethane (CH<sub>3</sub>CH<sub>3</sub>)? CH2)shorter and stronger than the C-H bond in ethane (CH3CH3)?

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The length and strength of a C-H bond depends on the hybridization of the carbon atom.The more s character in the hybrid orbital used by carbon to form the bond,the shorter and stronger the bond.This is because an s orbital is closer to the nucleus than is a p.Ethene uses carbon sp2 hybrid orbitals (1/3 s character)to make its carbon-hydrogen bonds while ethane uses carbon sp3 (1/4 s character).

Give the shape of the methyl radical.


A) trigonal pyramidal
B) tetrahedral
C) bent
D) linear
E) trigonal planar

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BF3 has a dipole moment of zero.Propose a structure for BF3 that is consistent with this information.

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BF3 is trig...

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Identify the hybridization of the oxygen in CH3OCH3.


A) sp
B) sp2
C) sp3
D) sp4
E) sp5

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Which of the following is an sp2 hybridized carbon?


A) Which of the following is an sp<sup>2</sup> hybridized carbon? A) B) ∙ CH<sub>3</sub> C) D) A and B E) A,B and C
B) ∙ CH3
C) Which of the following is an sp<sup>2</sup> hybridized carbon? A) B) ∙ CH<sub>3</sub> C) D) A and B E) A,B and C
D) A and B
E) A,B and C

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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

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