Question 1

According to molecular orbital theory,what is the bond order in the O2- ion?

Accepted Answer

A) 5.5 
B) 5 
C) 4 
D) 2.5 
E) 1.5 
A) 5.5 
B) 5 
C) 4 
D) 2.5 
E) 1.5 E

Question 2

Which formula is incorrectly matched with its VSEPR model representation? (Note: Lone pairs on the models,if any,are not shown.)

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)    A

Question 3

According to the VSEPR model,a molecule with the general formula AB5 with one lone pair on the central atom will have a ______ molecular geometry.

Accepted Answer

A) tetrahedral 
B) trigonalbipyramidal 
C) square pyramidal 
D) octahedral 
E) seesaw 
A) tetrahedral 
B) trigonalbipyramidal 
C) square pyramidal 
D) octahedral 
E) seesaw C

Question 4

What is the molecular geometry of the thiocyanate anion,SCN-,as predicted by the VSEPR model? (Carbon is the central atom.)

Accepted Answer

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

Question 5

Rank the following molecules in order of increasing dipole moment.

Accepted Answer

A) III < II < I 
B) III < I < II 
C) I < II < III 
D) I < III < II 
E) II < III < I 
A) III < II < I 
B) III < I < II 
C) I < II < III 
D) I < III < II 
E) II < III < I

Question 6

What is the molecular geometry of ClF2- as predicted by the VSEPR model?

Accepted Answer

A) linear 
B) bent 
C) seesaw 
D) T-shaped 
E) trigonal bipyramidal 
A) linear 
B) bent 
C) seesaw 
D) T-shaped 
E) trigonal bipyramidal

Question 7

According to the VSEPR model,the predicted molecular geometry of the SO3 molecule is

Accepted Answer

A) pyramidal. 
B) tetrahedral. 
C) trigonal planar. 
D) seesaw. 
E) square planar. 
A) pyramidal. 
B) tetrahedral. 
C) trigonal planar. 
D) seesaw. 
E) square planar.

Question 8

Allene,C3H4 (shown below),is one component of gas used for high-temperature welding. According to the valence bond model,which is a proper description of the bonding on the central carbon atom in allene?

Accepted Answer

A) It shares four π bonds,two with each carbon atom on either side. 
B) It shares four σ bonds,two with each carbon atom on either side. 
C) It shares one σ bond and one π bond with each carbon atom on either side. 
D) It shares two σ bonds with the carbon atom on the left,and two π bonds with the carbon atom on the right. 
E) It shares two σ bonds with the carbon atom on the right,and two π bonds with the carbon atom on the left. 
A) It shares four π bonds,two with each carbon atom on either side. 
B) It shares four σ bonds,two with each carbon atom on either side. 
C) It shares one σ bond and one π bond with each carbon atom on either side. 
D) It shares two σ bonds with the carbon atom on the left,and two π bonds with the carbon atom on the right. 
E) It shares two σ bonds with the carbon atom on the right,and two π bonds with the carbon atom on the left.

Question 9

What is the hybridization on the central atom in NO3- ?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2

Question 10

Which one of the following molecules is polar?

Accepted Answer

A) PBr5 
B) CCl4 
C) BrF5 
D) XeF2 
E) XeF4 
A) PBr5 
B) CCl4 
C) BrF5 
D) XeF2 
E) XeF4

Question 11

Which is true concerning the dipole moment of a CO2 molecule?

Accepted Answer

A) The dipole moment is zero because the C-O bond is nonpolar. 
B) The dipole moment is zero because the molecule is linear. 
C) The dipole moment is zero because the molecule is bent. 
D) The dipole moment is nonzero because the molecule is linear. 
E) The dipole moment is nonzero because the molecule is bent. 
A) The dipole moment is zero because the C-O bond is nonpolar. 
B) The dipole moment is zero because the molecule is linear. 
C) The dipole moment is zero because the molecule is bent. 
D) The dipole moment is nonzero because the molecule is linear. 
E) The dipole moment is nonzero because the molecule is bent.

Question 12

Water has ___________ (number)lone pair(s)of electrons on the central oxygen.

Accepted Answer

The answer of Water has ___________ (number)lone pair(s)of electrons on...

Question 13

What is the molecular geometry of N2O as predicted by the VSEPR model?

Accepted Answer

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

Question 14

What is the hybridization of the As atom in the AsF5 molecule?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2

Question 15

Hyposulfite,SO22-,is a polyatomic ion that has not yet been definitively confirmed to exist.However,the VSEPR model may still be applied to yield a prediction on its molecular geometry.What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

Accepted Answer

A) 90° 
B) 106° 
C) 109.5° 
D) 112° 
E) 120° 
A) 90° 
B) 106° 
C) 109.5° 
D) 112° 
E) 120°

Question 16

Thiocarbonyl disulfide (CSF2),based on the coordinate axes provided below,in which direction does the net molecular dipole moment point for the molecule?

Accepted Answer

A) It points in the +x direction. 
B) It points in the -x direction. 
C) It points in the +y direction. 
D) It points in the -y direction. 
E) The molecule does not have a net molecular dipole moment. 
A) It points in the +x direction. 
B) It points in the -x direction. 
C) It points in the +y direction. 
D) It points in the -y direction. 
E) The molecule does not have a net molecular dipole moment.

Question 17

Which is the most reasonable prediction for the H-N-H bond angle in NH3?

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 107° 
E) 105° 
A) 90° 
B) 109.5° 
C) 120° 
D) 107° 
E) 105°

Question 18

Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide,SO2 .

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2 
A) sp 
B) sp2 
C) sp3 
D) sp3d 
E) sp3d2

Question 19

Using the VSEPR model,predict the molecular geometry around the central atom in PO43-.

Accepted Answer

A) trigonal planar 
B) trigonal pyramidal 
C) tetrahedral 
D) trigonal bipyramidal 
E) octahedral 
A) trigonal planar 
B) trigonal pyramidal 
C) tetrahedral 
D) trigonal bipyramidal 
E) octahedral

Question 20

The BrF5 molecule has polar bonds and has a net dipole moment.

Accepted Answer

A) True 
 B)False

Exam 9: Chemical Bonding Ii Molecular Geometry and Bonding Theories

According to molecular orbital theory,what is the bond order in the O2- ion?

Which formula is incorrectly matched with its VSEPR model representation? (Note: Lone pairs on the models,if any,are not shown.)

According to the VSEPR model,a molecule with the general formula AB5 with one lone pair on the central atom will have a ______ molecular geometry.

What is the molecular geometry of the thiocyanate anion,SCN-,as predicted by the VSEPR model? (Carbon is the central atom.)

Rank the following molecules in order of increasing dipole moment.

What is the molecular geometry of ClF2- as predicted by the VSEPR model?

According to the VSEPR model,the predicted molecular geometry of the SO3 molecule is

Allene,C3H4 (shown below),is one component of gas used for high-temperature welding. According to the valence bond model,which is a proper description of the bonding on the central carbon atom in allene?

What is the hybridization on the central atom in NO3- ?

Which one of the following molecules is polar?

Which is true concerning the dipole moment of a CO2 molecule?

Water has ___________ (number)lone pair(s)of electrons on the central oxygen.

What is the molecular geometry of N2O as predicted by the VSEPR model?

What is the hybridization of the As atom in the AsF5 molecule?

Hyposulfite,SO22-,is a polyatomic ion that has not yet been definitively confirmed to exist.However,the VSEPR model may still be applied to yield a prediction on its molecular geometry.What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

Thiocarbonyl disulfide (CSF2),based on the coordinate axes provided below,in which direction does the net molecular dipole moment point for the molecule?

Which is the most reasonable prediction for the H-N-H bond angle in NH3?

Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide,SO2 .

Using the VSEPR model,predict the molecular geometry around the central atom in PO43-.

The BrF5 molecule has polar bonds and has a net dipole moment.

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Filters

According to molecular orbital theory,what is the bond order in the O₂^- ion?

According to the VSEPR model,a molecule with the general formula AB₅ with one lone pair on the central atom will have a ______ molecular geometry.

What is the molecular geometry of the thiocyanate anion,SCN^-,as predicted by the VSEPR model? (Carbon is the central atom.)

What is the molecular geometry of ClF₂^- as predicted by the VSEPR model?

According to the VSEPR model,the predicted molecular geometry of the SO₃ molecule is

Allene,C₃H₄ (shown below),is one component of gas used for high-temperature welding. According to the valence bond model,which is a proper description of the bonding on the central carbon atom in allene?

What is the hybridization on the central atom in NO₃^- ?

Which is true concerning the dipole moment of a CO₂ molecule?

What is the molecular geometry of N₂O as predicted by the VSEPR model?

What is the hybridization of the As atom in the AsF₅ molecule?

Hyposulfite,SO₂^2-,is a polyatomic ion that has not yet been definitively confirmed to exist.However,the VSEPR model may still be applied to yield a prediction on its molecular geometry.What is the most reasonable estimate for the O-S-O bond angle in hyposulfite?

Thiocarbonyl disulfide (CSF₂),based on the coordinate axes provided below,in which direction does the net molecular dipole moment point for the molecule?

Which is the most reasonable prediction for the H-N-H bond angle in NH₃?

Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide,SO₂ .

Using the VSEPR model,predict the molecular geometry around the central atom in PO₄^3-.

The BrF₅ molecule has polar bonds and has a net dipole moment.