Question 1

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. 
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 2

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 3

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

Accepted Answer

Question 4

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. 
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 5

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. 
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 6

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 
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 7

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

Accepted Answer

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

Question 8

Two resonance forms for SOCl2 are given below.   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. 
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 9

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 :] -

Accepted Answer

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

Question 10

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. 
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 11

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. 
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 12

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

Question 13

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

Accepted Answer

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

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

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 
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 17

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 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

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

Exam 7: Covalent Bonding and Electron-Dot Structures

The compound ICl contains

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 ________.

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

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

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

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

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

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

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 :] -

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,

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

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

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

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

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

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

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

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

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

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

Chemical Tools: Experimentation and Measurement

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Ionic Compounds: Periodic Trends and Bonding

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

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Applications of Aqueous Equilibria

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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 .

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

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

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

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

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

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 :] ^-

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

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

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

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

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

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

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