Question 1

Predict the bond order of the NO- molecular ion.

Accepted Answer

A)  2 
B)  2.5 
C)  3 
D)  1 
E)  1.5 
A)  2 
B)  2.5 
C)  3 
D)  1 
E)  1.5 A

Question 2

Predict the bond order of the NO+ molecular ion.

Accepted Answer

A)  2 
B)  2.5 
C)  3 
D)  1 
E)  1.5 
A)  2 
B)  2.5 
C)  3 
D)  1 
E)  1.5 C

Question 3

Predict the following three bond angles and give your rationale: N - C - C, O - C   O, and C - O - H. These bonding patterns appear in amino acids.

Accepted Answer

N - C - C: 109^°steric number of central C is 4 O - C O, 120^° steric number of C is 3 C - O - H: near but less than 109^°steric number of O is 4 but repulsion by lone pairs decreases angle

Question 4

Which of the following compounds has a trigonal bipyramidal shape?

Accepted Answer

A)  ICl3 
B)  BrF5 
C)  PCl5 
D)  PH3 
E)  SiF4 
A)  ICl3 
B)  BrF5 
C)  PCl5 
D)  PH3 
E)  SiF4

Question 5

Which of the following molecules has a carbon atom that is sp3 hybridized?

Accepted Answer

A)  C2H2 
B)  H2CO 
C)  CH3Cl 
D)  C2H4 
E)  C2H2Cl2 
A)  C2H2 
B)  H2CO 
C)  CH3Cl 
D)  C2H4 
E)  C2H2Cl2

Question 6

Boron nitride, BN, is a new high tech material. According to the molecular orbital energy level diagram below, which one of the following statements is not correct about boron nitride?

Accepted Answer

A)  The bond order in BN is 2.0. 
B)  The cation BN+ has a longer bond than BN. 
C)  BN is paramagnetic. 
D)  The bond order in the cation BN+ is 1.5. 
E)  The anion BN- has a weaker bond than BN. 
A)  The bond order in BN is 2.0. 
B)  The cation BN+ has a longer bond than BN. 
C)  BN is paramagnetic. 
D)  The bond order in the cation BN+ is 1.5. 
E)  The anion BN- has a weaker bond than BN.

Question 7

Which of the following molecules or ions is not polar?

Accepted Answer

A)  O3 
B)  H2O 
C)  SO2 
D)  I3- 
E)  S3 
A)  O3 
B)  H2O 
C)  SO2 
D)  I3- 
E)  S3

Question 8

What is the hybridization of the oxygen in the H3O+ ion?

Accepted Answer

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

Question 9

Which of the following molecules is paramagnetic?

Accepted Answer

A)  F2 
B)  O2 
C)  C2 
D)  Be2 
E)  "C2" 
A)  F2 
B)  O2 
C)  C2 
D)  Be2 
E)  "C2"

Question 10

Which of the following molecules has a trigonal pyramid shape?

Accepted Answer

A)  KrF4 
B)  COCl2 
C)  SeO32- 
D)  NH4+ 
E)  O3 
A)  KrF4 
B)  COCl2 
C)  SeO32- 
D)  NH4+ 
E)  O3

Question 11

Use the 1s orbital of hydrogen to form atomic orbitals for H2 and draw the molecular orbital energy level diagram. Label the energy levels with the MO symbols. Which of the following species of hydrogen would you predict to be stable based on your energy level diagram? Explain.
H22+, H2+, H2, H2-, H22-

Accepted Answer

F1F1F1S1F1F1F10*____________

Question 12

Which of the following has a local molecular geometry about a carbon atom that is trigonal planar?

Accepted Answer

A)  CH3CH2OH 
B)  CH3OH 
C)  C2H4 
D)  CH3OCH3 
E)  C2H2 
A)  CH3CH2OH 
B)  CH3OH 
C)  C2H4 
D)  CH3OCH3 
E)  C2H2

Question 13

Which of the following molecules is linear?

Accepted Answer

A)  H2O 
B)  H2S 
C)  ICl3 
D)  I3- 
E)  SO2 
A)  H2O 
B)  H2S 
C)  ICl3 
D)  I3- 
E)  SO2

Question 14

Of the following molecules (O3, SCl2, SO2, CS2, and CO2) which ones do you predict to have a bond angle of 180°?

Accepted Answer

Question 15

What hybridization is needed to describe the square planar molecular geometry of KrF4?

Accepted Answer

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

Question 16

According to the molecular orbital energy level diagram below, which one of the following statements is not correct about NO, NO+, and   ?

Accepted Answer

A)  The bond order in NO is 2.5. 
B)  NO+ has the shortest bond. 
C)  Only one of these species is paramagnetic. 
D)  The bond order in   is 2.0. 
E)    has the weakest bond. 
A)  The bond order in NO is 2.5. 
B)  NO+ has the shortest bond. 
C)  Only one of these species is paramagnetic. 
D)  The bond order in   is 2.0. 
E)    has the weakest bond.

Question 17

Identify the molecular structure of the nitrate ion,   , and the hybridization of the N atomic orbitals.

Accepted Answer

The answer of Identify the molecular structure of the nitrate...

Question 18

What is the valence electron molecular orbital electron configuration of C2?

Accepted Answer

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

Question 19

For which one of the following molecules (BF3, CF4, NF3, OF2, XeF4) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Accepted Answer

@#IMG-DLM& In the diagram each

Question 20

Ethanol has the formula CH3CH2OH. The central carbon atom has a _____ local molecular geometry and _____ hybridization.

Accepted Answer

A)  trigonal planar; sp 
B)  tetrahedral; sp3 
C)  tetrahedral; sp2 
D)  seesaw; sp2 
E)  seesaw, sp3 
A)  trigonal planar; sp 
B)  tetrahedral; sp3 
C)  tetrahedral; sp2 
D)  seesaw; sp2 
E)  seesaw, sp3

Exam 9: Molecular Geometry and Bonding Theories

Predict the bond order of the NO- molecular ion.

Predict the bond order of the NO+ molecular ion.

Predict the following three bond angles and give your rationale: N - C - C, O - C O, and C - O - H. These bonding patterns appear in amino acids.

Which of the following compounds has a trigonal bipyramidal shape?

Which of the following molecules has a carbon atom that is sp3 hybridized?

Boron nitride, BN, is a new high tech material. According to the molecular orbital energy level diagram below, which one of the following statements is not correct about boron nitride?

Which of the following molecules or ions is not polar?

What is the hybridization of the oxygen in the H3O+ ion?

Which of the following molecules is paramagnetic?

Which of the following molecules has a trigonal pyramid shape?

Which of the following has a local molecular geometry about a carbon atom that is trigonal planar?

Which of the following molecules is linear?

Of the following molecules (O3, SCl2, SO2, CS2, and CO2) which ones do you predict to have a bond angle of 180°?

What hybridization is needed to describe the square planar molecular geometry of KrF4?

According to the molecular orbital energy level diagram below, which one of the following statements is not correct about NO, NO+, and ?

Identify the molecular structure of the nitrate ion, , and the hybridization of the N atomic orbitals.

What is the valence electron molecular orbital electron configuration of C2?

For which one of the following molecules (BF3, CF4, NF3, OF2, XeF4) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Ethanol has the formula CH3CH2OH. The central carbon atom has a _____ local molecular geometry and _____ hybridization.

Matter, Energy, and the Origins of the Universe

Atoms, Ions, and Compounds

Chemical Reactions and Earths Composition

Solution Chemistry and the Hydrosphere

Thermochemistry

Properties of Gases: the Air We Breathe

Electrons in Atoms and Periodic Properties

Chemical Bonding and Climate Change

Forces Between Ions and Molecules

Solutions and Their Colligative Properties

The Chemistry of Solids

Organic Chemistry: Fuels, Pharmaceuticals, and Materials

Thermodynamics: Spontaneous Processes, Entropy, and Free Energy

Chemical Kinetics

Chemical Equilibrium

Equilibrium in the Aqueous Phase

The Colorful Chemistry of Metals

Electrochemistry and the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry

Life and the Periodic Table

Filters

Predict the bond order of the NO^- molecular ion.

Predict the bond order of the NO⁺ molecular ion.

Which of the following molecules has a carbon atom that is sp³ hybridized?

What is the hybridization of the oxygen in the H₃O⁺ ion?

Of the following molecules (O₃, SCl₂, SO₂, CS₂, and CO₂) which ones do you predict to have a bond angle of 180°?

What hybridization is needed to describe the square planar molecular geometry of KrF₄?

According to the molecular orbital energy level diagram below, which one of the following statements is not correct about NO, NO⁺, and ?

What is the valence electron molecular orbital electron configuration of C₂?

For which one of the following molecules (BF₃, CF₄, NF₃, OF₂, XeF₄) is the electron geometry tetrahedral and the molecular geometry triangular pyramidal? Draw its Lewis structure with the correct bond angles.

Ethanol has the formula CH₃CH₂OH. The central carbon atom has a _ local molecular geometry and _ hybridization.