Question 1

A molecular compound that obeys the octet rule in which all atoms have a zero formal charge is

Accepted Answer

A)  BaCl2
B)  BrF3
C)  NCl3
D)  XeF4

Question 2

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 3

What is the hybridization of the nitrogen atom?

Accepted Answer

A)  sp
B)  sp2
C)  sp3
D)  None of these

Question 4

What are the bond angles in the following molecular model of BCl3? 3?   A) less than 109.5° B) 109.5° C) less than 120° but greater than 109.5° D) 120°" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  less than 109.5°
B)  109.5°
C)  less than 120° but greater than 109.5°
D)  120°

Question 5

Which molecule contains the most polar bonds?

Accepted Answer

A)  CF4
B)  CO2
C)  CN-
D)  CH4

Question 6

What is the geometry around the central atom in the following molecular model of XeF4? 4?   A) trigonal bipyramidal B) octahedral C) square pyramidal D) square planar" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  trigonal bipyramidal
B)  octahedral
C)  square pyramidal
D)  square planar

Question 7

The electronegativity is 2.1 for H and 1.8 for Si.Based on these electronegativities,SiH4 would be expected to

Accepted Answer

A)  be ionic and contain H- ions.
B)  be ionic and contain H+ ions.
C)  have polar covalent bonds with a partial negative charges on the H atoms.
D)  have polar covalent bonds with a partial positive charges on the H atoms.

Question 8

Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table period

Accepted Answer

A)  2 or lower.
B)  3 or lower.
C)  4 or lower.
D)  5 or lower.

Question 9

What is the angle between adjacent sp3 hybrid orbitals?

Accepted Answer

A)  90°
B)  109.5°
C)  120°
D)  180°

Question 10

A molecular model of NO3- is shown below.Based on the best Lewis electron-dot structure for NO3- and formal charge considerations,what is the predicted N-O bond order for each N-O bond? 3- is shown below.Based on the best Lewis electron-dot structure for NO3- and formal charge considerations,what is the predicted N-O bond order for each N-O bond?   A) 1 B) 1) 33 C) 1) 5 D) 2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1
B)  1) 33
C)  1) 5
D)  2

Question 11

In the best Lewis structure for NO+,what is the formal charge on the N atom?

Accepted Answer

A)  -1
B)  0
C)  +1
D)  +2

Question 12

The following ball-and-stick molecular model is a representation of the amino acid alanine (unshaded spheres = H) .Only the connections between atoms are shown;multiple bonds and nonbonded electrons are not indicated. 
-In order to complete an electron-dot structure of alanine,the nitrogen atom needs

Accepted Answer

A)  1 additional bond and 1 nonbonded pair of electrons.
B)  1 additional bond and 2 nonbonded pairs of electrons.
C)  1 nonbonded pair of electrons.
D)  2 nonbonded pairs of electrons.

Question 13

Which orbital hybridization is associated with a tetrahedral charge cloud arrangement?

Accepted Answer

A)  sp
B)  sp2
C)  sp3
D)  None of these

Question 14

Of the following elements,which has the highest electronegativity?

Accepted Answer

A)  P
B)  S
C)  Sc
D)  As

Question 15

Which drawing represents the molecular orbital containing the highest energy electrons in the H2 molecule in its ground state?

Accepted Answer

A)   2 molecule in its ground state? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)   2 molecule in its ground state? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)   2 molecule in its ground state? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)   2 molecule in its ground state? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >

Question 16

How many electrons are in the valence shell of I in IF4-?

Accepted Answer

A)  8
B)  10
C)  12
D)  14

Question 17

Which molecular orbital resembles a p-orbital?

Accepted Answer

A)  σ
B)  σ*
C)  π
D)  π*

Question 18

The phosphorus atom in PCl3 would be expected to have a

Accepted Answer

A)  partial positive (δ+) charge.
B)  partial negative (δ-) charge.
C)  3+ charge.
D)  3- charge.

Question 19

The compound ClF  contains

Accepted Answer

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

Question 20

Which is expected to have the strongest C-O bond?

Accepted Answer

A)  CH3OH
B)  COCl2
C)  CH3CO2-
D)  CO32-

Exam 7: Covalent Bonds and Molecular Structure

Which is expected to have the strongest C-O bond?

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What are the bond angles in the following molecular model of BCl3?

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A molecular model of NO3- is shown below.Based on the best Lewis electron-dot structure for NO3- and formal charge considerations,what is the predicted N-O bond order for each N-O bond?

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The compound ClF contains

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Of the following elements,which has the highest electronegativity?

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Which orbital hybridization is associated with a tetrahedral charge cloud arrangement?

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The phosphorus atom in PCl3 would be expected to have a

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What is the angle between adjacent sp3 hybrid orbitals?

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The electronegativity is 2.1 for H and 1.8 for Si.Based on these electronegativities,SiH4 would be expected to

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Correct AnswerverifiedShow Answer

A molecular compound that obeys the octet rule in which all atoms have a zero formal charge is

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Which molecular orbital resembles a p-orbital?

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Which molecule contains the most polar bonds?

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What is the geometry around the central atom in the following molecular model of XeF4?

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What is the hybridization of the nitrogen atom?

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Which drawing represents the molecular orbital containing the highest energy electrons in the H2 molecule in its ground state?

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In the best Lewis structure for NO+,what is the formal charge on the N atom?

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Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table period

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The compound ICl contains

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How many electrons are in the valence shell of I in IF4-?

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What are the bond angles in the following molecular model of BCl₃?

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A molecular model of NO₃^- is shown below.Based on the best Lewis electron-dot structure for NO₃^- and formal charge considerations,what is the predicted N-O bond order for each N-O bond?

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The phosphorus atom in PCl₃ would be expected to have a

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What is the angle between adjacent sp³ hybrid orbitals?

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The electronegativity is 2.1 for H and 1.8 for Si.Based on these electronegativities,SiH₄ would be expected to

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What is the geometry around the central atom in the following molecular model of XeF₄?

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Which drawing represents the molecular orbital containing the highest energy electrons in the H₂ molecule in its ground state?

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In the best Lewis structure for NO⁺,what is the formal charge on the N atom?

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How many electrons are in the valence shell of I in IF₄^-?

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