Question 1

List the number of sigma bonds and pi bonds in a single bond.

Accepted Answer

A) 1 sigma, 0 pi 
B) 0 sigma, 1 pi 
C) 1 sigma, 1 pi 
D) 1 sigma, 2 pi 
A) 1 sigma, 0 pi 
B) 0 sigma, 1 pi 
C) 1 sigma, 1 pi 
D) 1 sigma, 2 pi

Question 2

A molecule containing a central atom with sp2 hybridization has a ________ electron geometry.

Accepted Answer

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

Question 3

The hybrid orbital set used by the central atom in KrF2 is ________.

Accepted Answer

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

Question 4

A molecule or ion with two electrons in a bonding orbital and two electrons in an antibonding orbital would have a bond order of:

Accepted Answer

A) 0 
B) 1 
C) 1.5 
D) 0.5 
E) -1 
A) 0 
B) 1 
C) 1.5 
D) 0.5 
E) -1

Question 5

Draw a molecular orbital diagram and use it to determine which of the following is paramagnetic.

Accepted Answer

A) B22⁺ 
B) B22⁻ 
C) N22⁺ 
D) C22⁻ 
E) B2 
A) B22⁺ 
B) B22⁻ 
C) N22⁺ 
D) C22⁻ 
E) B2

Question 6

Draw the Lewis structure for SF6. What is the hybridization on the S atom?

Accepted Answer

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

Question 7

List the number of sigma bonds and pi bonds in a triple bond.

Accepted Answer

A) 1 sigma, 1 pi 
B) 2 sigma, 1 pi 
C) 2 sigma, 2 pi 
D) 1 sigma, 2 pi 
A) 1 sigma, 1 pi 
B) 2 sigma, 1 pi 
C) 2 sigma, 2 pi 
D) 1 sigma, 2 pi

Question 8

Give the approximate bond angle for a molecule with an octahedral shape.

Accepted Answer

A) 109.5° 
B) 180° 
C) 120° 
D) 105° 
E) 90° 
A) 109.5° 
B) 180° 
C) 120° 
D) 105° 
E) 90°

Question 9

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Accepted Answer

A) C22⁺ 
B) N22⁺ 
C) B2 
D) C22⁻ 
E) B22⁺ 
A) C22⁺ 
B) N22⁺ 
C) B2 
D) C22⁻ 
E) B22⁺

Question 10

Describe a pi bond.

Accepted Answer

A) side by side overlap of p orbitals 
B) end to end overlap of p orbitals 
C) s orbital overlapping with the end of a p orbital 
D) overlap of two s orbitals 
E) p orbital overlapping with a d orbital 
A) side by side overlap of p orbitals 
B) end to end overlap of p orbitals 
C) s orbital overlapping with the end of a p orbital 
D) overlap of two s orbitals 
E) p orbital overlapping with a d orbital

Question 11

Place the following in order of decreasing dipole moment. I. cis-CHCl=CHCl II. trans-CHCl=CHCI III. cis-CHF=CHF

Accepted Answer

A) III > I > II 
B) II > I > III 
C) I > III > II 
D) II > III > I 
E) I = III > II 
A) III > I > II 
B) II > I > III 
C) I > III > II 
D) II > III > I 
E) I = III > II

Question 12

According to molecular orbital theory, what is an antibonding orbital?

Accepted Answer

An antibonding orbital is formed when tw

Question 13

In molecular orbital theory the acronym LUMO stands for

Accepted Answer

A) lowest unhybridized molecular orientation. 
B) lowest unoccupied molecular orbital. 
C) lowest unhybridized molecular orbital. 
D) linear-uninteresting molecular orientation. 
E) It has no meaning. 
A) lowest unhybridized molecular orientation. 
B) lowest unoccupied molecular orbital. 
C) lowest unhybridized molecular orbital. 
D) linear-uninteresting molecular orientation. 
E) It has no meaning.

Question 14

A pilot checks for water in the gas before flying a small airplane. How does she do it?

Accepted Answer

A) She drains a little bit of gas from the bottom and looks for two layers. 
B) She smells it. 
C) She shakes the wings. 
D) She pipets the liquid from the top of the tank and looks for two layers. 
E) She checks the gas gauge. 
A) She drains a little bit of gas from the bottom and looks for two layers. 
B) She smells it. 
C) She shakes the wings. 
D) She pipets the liquid from the top of the tank and looks for two layers. 
E) She checks the gas gauge.

Question 15

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined atom CH3OCH3.

Accepted Answer

A) eg = tetrahedral, mg = tetrahedral 
B) eg = linear, mg = linear 
C) eg = tetrahedral, mg = bent 
D) eg = trigonal bipyramidal, mg = tetrahedral 
E) eg = octahedral, mg = square planar 
A) eg = tetrahedral, mg = tetrahedral 
B) eg = linear, mg = linear 
C) eg = tetrahedral, mg = bent 
D) eg = trigonal bipyramidal, mg = tetrahedral 
E) eg = octahedral, mg = square planar

Question 16

Draw the Lewis structure for H3O+. What is the hybridization on the O atom?

Accepted Answer

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

Question 17

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined carbon in CH3CN.

Accepted Answer

A) eg = tetrahedral, mg = tetrahedral 
B) eg = linear, mg = trigonal planar 
C) eg = trigonal planar, mg = bent 
D) eg = linear, mg = linear 
E) eg = trigonal planar, mg = trigonal planar 
A) eg = tetrahedral, mg = tetrahedral 
B) eg = linear, mg = trigonal planar 
C) eg = trigonal planar, mg = bent 
D) eg = linear, mg = linear 
E) eg = trigonal planar, mg = trigonal planar

Question 18

Identify the number of electron groups around a molecule with a trigonal bipyramidal shape.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 19

Match the following.

-sp2

Accepted Answer

A) tetrahedral 
B) nonpolar, but contains a polar covalent bond 
C) sp hybridized central atom 
D) trigonal bipyramidal 
E) trigonal planar
F)polar
G)linear
H)seesaw molecular geometry
I)octahedral
J)octahedral electron geometry
K)polar, but contains no polar bonds
L)sp2 hybridized central atom 
A) tetrahedral 
B) nonpolar, but contains a polar covalent bond 
C) sp hybridized central atom 
D) trigonal bipyramidal 
E) trigonal planar
F)polar
G)linear
H)seesaw molecular geometry
I)octahedral
J)octahedral electron geometry
K)polar, but contains no polar bonds
L)sp2 hybridized central atom

Question 20

Match the following.

-SF4

Accepted Answer

A) tetrahedral 
B) nonpolar, but contains a polar covalent bond 
C) sp hybridized central atom 
D) trigonal bipyramidal 
E) trigonal planar
F)polar
G)linear
H)seesaw molecular geometry
I)octahedral
J)octahedral electron geometry
K)polar, but contains no polar bonds
L)sp2 hybridized central atom 
A) tetrahedral 
B) nonpolar, but contains a polar covalent bond 
C) sp hybridized central atom 
D) trigonal bipyramidal 
E) trigonal planar
F)polar
G)linear
H)seesaw molecular geometry
I)octahedral
J)octahedral electron geometry
K)polar, but contains no polar bonds
L)sp2 hybridized central atom

Exam 10: Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

List the number of sigma bonds and pi bonds in a single bond.

A molecule containing a central atom with sp2 hybridization has a ________ electron geometry.

The hybrid orbital set used by the central atom in KrF2 is ________.

A molecule or ion with two electrons in a bonding orbital and two electrons in an antibonding orbital would have a bond order of:

Draw a molecular orbital diagram and use it to determine which of the following is paramagnetic.

Draw the Lewis structure for SF6. What is the hybridization on the S atom?

List the number of sigma bonds and pi bonds in a triple bond.

Give the approximate bond angle for a molecule with an octahedral shape.

Draw a molecular orbital diagram and use it to determine which of the following is most stable.

Describe a pi bond.

Place the following in order of decreasing dipole moment. I. cis-CHCl=CHCl II. trans-CHCl=CHCI III. cis-CHF=CHF

According to molecular orbital theory, what is an antibonding orbital?

In molecular orbital theory the acronym LUMO stands for

A pilot checks for water in the gas before flying a small airplane. How does she do it?

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined atom CH3OCH3.

Draw the Lewis structure for H3O+. What is the hybridization on the O atom?

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined carbon in CH3CN.

Identify the number of electron groups around a molecule with a trigonal bipyramidal shape.

Match the following. -sp2

Match the following. -SF4

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

A molecule containing a central atom with sp² hybridization has a ________ electron geometry.

The hybrid orbital set used by the central atom in KrF₂ is ________.

Draw the Lewis structure for SF₆. What is the hybridization on the S atom?

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined atom CH₃OCH₃.

Draw the Lewis structure for H₃O⁺. What is the hybridization on the O atom?

Determine the electron geometry (eg)and molecular geometry (mg)of the underlined carbon in CH₃CN.

Match the following. -sp²

Match the following. -SF₄