Question 1

Two resonance forms for SOCl2 are given below. 2 are given below.   Which is favored by the octet rule and which by formal charge considerations? A) I is favored by the octet rule and by formal charge considerations. B) I is favored by the octet rule and II by formal charge considerations. C) II is favored by the octet rule and I by formal charge considerations. D) II is favored by the octet rule and by formal charge considerations." class="answers-bank-image d-inline" rel="preload" > Which is favored by the octet rule and which by formal charge considerations?

Accepted Answer

A)  I is favored by the octet rule and by formal charge considerations.
B)  I is favored by the octet rule and II by formal charge considerations.
C)  II is favored by the octet rule and I by formal charge considerations.
D)  II is favored by the octet rule and by formal charge considerations.

Question 2

Assign formal charges to each atom in the resonance form for SOCl2 given below. 2 given below.   A) 0 for Cl,0 for S,and 0 for O B) 0 for Cl,+1 for S,and -1 for O C) -1 for Cl,+4 for S,and -2 for O D) -1 for Cl,-2 for S,and -2 for O" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0 for Cl,0 for S,and 0 for O
B)  0 for Cl,+1 for S,and -1 for O
C)  -1 for Cl,+4 for S,and -2 for O
D)  -1 for Cl,-2 for S,and -2 for O

Question 3

Arrange the following in order of increasing ionic character: Al2S3,MgS,Na2S,P4S3,S8.

Accepted Answer

A)  MgS,Na2S,Al2S3,P4S3,S8
B)  Na2S,MgS,Al2S3,P4S3,S8
C)  S8,P4S3,Al2S3,MgS,Na2S
D)  S8,P4S3,Al2S3,Na2S,MgS

Question 4

The Lewis electron-dot structure of H2CO has ________ nonbonding electron pairs,________ bonding electron pairs,and a carbon-oxygen bond order of ________.

Accepted Answer

Question 5

Which of the following molecules is expected to have the highest melting point?

Accepted Answer

A)  H2
B)  Cl2
C)  CCl4
D)  NaCl

Question 6

The nitrogen-nitrogen bond in :N  N: has a bond order of

Accepted Answer

A)  3
B)  1
C)  2
D)  6

Question 7

Based on formal charge considerations,the electron-dot structure of CO32- ion has

Accepted Answer

A)  two resonance structures involving two single bonds and one double bond.
B)  two resonance structures involving one single bond and two double bonds.
C)  three resonance structures involving two single bonds and one double bond.
D)  three resonance structures involving one single bond and two double bonds.

Question 8

Compound A is a solid with a melting point of 85°C,and compound B is a gas at 75°C and one atmosphere pressure.Based on these data,one would expect

Accepted Answer

A)  both compounds to be covalent.
B)  compound A to be ionic and compound B to be covalent.
C)  compound A to be covalent and compound B to be ionic.
D)  both compounds to be ionic.

Question 9

The electronegativities for the elements vary from 0.7 for cesium to 4.0 for fluorine.The electronegativity for iodine is 2.5.Based entirely on the general guidelines for electronegativities and bond character,

Accepted Answer

A)  binary compounds with iodine should all be polar covalent with a δ- on I.
B)  binary compounds with iodine should all be polar covalent with a δ+ on I.
C)  compounds with iodine may be ionic,polar covalent,or nonpolar covalent.
D)  no binary compounds with iodine should be substantially ionic.

Question 10

Of the bonds C-C,C-N,C-O,and C-F,the bond that is most polar is ________.

Accepted Answer

The answer of Of the bonds C-C,C-N,C-O,and C-F,the bond that...

Question 11

How many lone pairs of electrons are on the I atom in IF5?

Accepted Answer

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

Question 12

What is the approximate carbon-oxygen bond order in CO32-?

Accepted Answer

A)  2
B)  4/3
C)  5/3
D)  4

Question 13

Based on formal charges,the P-O bond order in POCl3 is expected to be ________.

Accepted Answer

Question 14

In the most acceptable electron-dot structure for carbonyl fluoride,COF2 the central atom is

Accepted Answer

A)  C,which is singly-bonded to O.
B)  C,which is doubly-bonded to O.
C)  O,which is singly-bonded to C
D)  O,which is doubly-bonded to C.

Question 15

Among the compounds H3C-CH3,H2C=CH2,and HC  CH,the compound with the strongest carbon-carbon bond is ________,and the compound with the longest carbon-carbon bond is ________.

Accepted Answer

Question 16

The compound ICl  contains

Accepted Answer

A)  ionic bonds.
B)  nonpolar covalent bonds.
C)  polar covalent bonds with partial negative charges on the Cl atoms.
D)  polar covalent bonds with partial negative charges on the I atoms.

Question 17

Which of the following are allowed resonance forms of NCS-? I [: N -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > C - -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > :] - and [: -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > = C = -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > :] -
II [: N -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > C - -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > :] - and [: N -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > C = -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > :] -
III [: N -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > C - -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > :] - and [: -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > - C -? I [: N   C -   :] - and [:   = C =   :] - II [: N   C -   :] - and [: N   C =   :] - III [: N   C -   :] - and [:   - C   N :] - A) only I B) only II C) only III D) I and III" class="answers-bank-image d-inline" rel="preload" > N :] -

Accepted Answer

A)  only I
B)  only II
C)  only III
D)  I and III

Question 18

When melting S8,________ forces must be overcome and S8 is expected to have a ________ melting point than MgS.

Accepted Answer

A)  covalent bonding,higher
B)  covalent bonding,lower
C)  intermolecular,higher
D)  intermolecular,lower

Question 19

How many lone pairs of electrons are on the N atom in NBr3?

Accepted Answer

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

Question 20

How many lone pairs in the correct electron dot structure of O3?

Accepted Answer

A)  2
B)  3
C)  4
D)  6

Exam 7: Covalent Bonding and Electron-Dot Structures

Which of the following molecules is expected to have the highest melting point?

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The Lewis electron-dot structure of H2CO has ________ nonbonding electron pairs,________ bonding electron pairs,and a carbon-oxygen bond order of ________.

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The compound ICl contains

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The nitrogen-nitrogen bond in :N N: has a bond order of

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Which of the following are allowed resonance forms of NCS-? I [: N C - :] - and [: = C = :] - II [: N C - :] - and [: N C = :] - III [: N C - :] - and [: - C N :] -

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Compound A is a solid with a melting point of 85°C,and compound B is a gas at 75°C and one atmosphere pressure.Based on these data,one would expect

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Among the compounds H3C-CH3,H2C=CH2,and HC CH,the compound with the strongest carbon-carbon bond is ________,and the compound with the longest carbon-carbon bond is ________.

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In the most acceptable electron-dot structure for carbonyl fluoride,COF2 the central atom is

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Based on formal charge considerations,the electron-dot structure of CO32- ion has

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When melting S8,________ forces must be overcome and S8 is expected to have a ________ melting point than MgS.

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How many lone pairs of electrons are on the I atom in IF5?

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How many lone pairs in the correct electron dot structure of O3?

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Based on formal charges,the P-O bond order in POCl3 is expected to be ________.

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What is the approximate carbon-oxygen bond order in CO32-?

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Arrange the following in order of increasing ionic character: Al2S3,MgS,Na2S,P4S3,S8.

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The electronegativities for the elements vary from 0.7 for cesium to 4.0 for fluorine.The electronegativity for iodine is 2.5.Based entirely on the general guidelines for electronegativities and bond character,

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Of the bonds C-C,C-N,C-O,and C-F,the bond that is most polar is ________.

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How many lone pairs of electrons are on the N atom in NBr3?

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Assign formal charges to each atom in the resonance form for SOCl2 given below.

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Two resonance forms for SOCl2 are given below. Which is favored by the octet rule and which by formal charge considerations?

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The Lewis electron-dot structure of H₂CO has nonbonding electron pairs, bonding electron pairs,and a carbon-oxygen bond order of .

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Which of the following are allowed resonance forms of NCS^-? I [: N C - :]^- and [: = C = :] ^- II [: N C - :] ^- and[: N C = :] ^- III [: N C - :] ^- and [: - C N :] ^-

Correct Answer
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Among the compounds H₃C-CH₃,H₂C=CH₂,and HC CH,the compound with the strongest carbon-carbon bond is ,and the compound with the longest carbon-carbon bond is .

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In the most acceptable electron-dot structure for carbonyl fluoride,COF₂ the central atom is

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Based on formal charge considerations,the electron-dot structure of CO₃^2- ion has

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When melting S₈, forces must be overcome and S₈ is expected to have a melting point than MgS.

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How many lone pairs of electrons are on the I atom in IF₅?

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How many lone pairs in the correct electron dot structure of O₃?

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Based on formal charges,the P-O bond order in POCl₃ is expected to be ________.

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What is the approximate carbon-oxygen bond order in CO₃^2-?

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Arrange the following in order of increasing ionic character: Al₂S₃,MgS,Na₂S,P₄S₃,S₈.

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How many lone pairs of electrons are on the N atom in NBr₃?

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Assign formal charges to each atom in the resonance form for SOCl₂ given below.

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Two resonance forms for SOCl₂ are given below. Which is favored by the octet rule and which by formal charge considerations?

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