Question 1

In counting the electron domains around the central atom in VSEPR theory, a __________ is not included.

Accepted Answer

A) nonbonding pair of electrons 
B) single covalent bond 
C) core level electron pair 
D) double covalent bond 
E) triple covalent bond 
A) nonbonding pair of electrons 
B) single covalent bond 
C) core level electron pair 
D) double covalent bond 
E) triple covalent bond

Question 2

There are __________ σ and __________ π bonds in the H2C=CH2 molecule.

Accepted Answer

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

Question 3

The hybridization of the carbon atom in carbon dioxide 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

An antibonding MO __________ the corresponding bonding MO.

Accepted Answer

A) is always lower in energy than 
B) can accommodate more electrons than 
C) can accommodate fewer electrons than 
D) is always higher in energy than 
E) is always degenerate with 
A) is always lower in energy than 
B) can accommodate more electrons than 
C) can accommodate fewer electrons than 
D) is always higher in energy than 
E) is always degenerate with

Question 5

In molecular orbital theory, the σ1s orbital is __________ and the σ1s* orbital is __________ in the H2 molecule.

Accepted Answer

A) filled, filled 
B) filled, empty 
C) filled, half-filled 
D) half-filled, filled 
E) empty, filled 
A) filled, filled 
B) filled, empty 
C) filled, half-filled 
D) half-filled, filled 
E) empty, filled

Question 6

The order of MO energies in B2, C2, and N2 (σ2p > π2p), is different from the order in O2, F2, and Ne2 (σ2p > π2p). This is due to __________.

Accepted Answer

A) less effective overlap of p orbitals in O2, F2, and Ne2 
B) the more metallic character of boron, carbon and nitrogen as compared to oxygen, fluorine, and neon 
C) greater 2s-2p interaction in O2, F2, and Ne2 
D) greater 2s-2p interaction in B2 C2, and N2 
E) less effective overlap of p orbitals in B2, C2, and N2 
A) less effective overlap of p orbitals in O2, F2, and Ne2 
B) the more metallic character of boron, carbon and nitrogen as compared to oxygen, fluorine, and neon 
C) greater 2s-2p interaction in O2, F2, and Ne2 
D) greater 2s-2p interaction in B2 C2, and N2 
E) less effective overlap of p orbitals in B2, C2, and N2

Question 7

In which of the molecules is the central atom sp3d2 hybridized?

Accepted Answer

A) (i)and (ii) 
B) (iii)only 
C) (iii)and (iv) 
D) (iv)and (v) 
E) (v)only 
A) (i)and (ii) 
B) (iii)only 
C) (iii)and (iv) 
D) (iv)and (v) 
E) (v)only

Question 8

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 9

The hybrid orbitals used for bonding by the sulfur atom in the SF4 molecule are __________ orbitals.

Accepted Answer

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

Question 10

The Cl-Si-Cl bond angle in the SiCl2F2 molecule is approximately __________.

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60°

Question 11

The molecular geometry of the SF6 molecule is __________, and this molecule is __________.

Accepted Answer

A) trigonal pyramidal, polar 
B) octahedral, nonpolar 
C) trigonal planar, polar 
D) trigonal planar, nonpolar 
E) trigonal bipyramidal, polar 
A) trigonal pyramidal, polar 
B) octahedral, nonpolar 
C) trigonal planar, polar 
D) trigonal planar, nonpolar 
E) trigonal bipyramidal, polar

Question 12

The basis of the VSEPR model of molecular bonding is __________.

Accepted Answer

A) regions of electron density on an atom will organize themselves so as to maximize s-character 
B) regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap 
C) atomic orbitals of the bonding atoms must overlap for a bond to form 
D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions 
E) hybrid orbitals will form as necessary to, as closely as possible, achieve spherical symmetry 
A) regions of electron density on an atom will organize themselves so as to maximize s-character 
B) regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap 
C) atomic orbitals of the bonding atoms must overlap for a bond to form 
D) electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions 
E) hybrid orbitals will form as necessary to, as closely as possible, achieve spherical symmetry

Question 13

The hybridization of the oxygen atom labeled y in the structure below is __________. The C-O-H bond angle is __________.

Accepted Answer

A) sp, 180° 
B) sp2, 109.5° 
C) sp3, 109.5° 
D) sp3d2, 90° 
E) sp, 90° 
A) sp, 180° 
B) sp2, 109.5° 
C) sp3, 109.5° 
D) sp3d2, 90° 
E) sp, 90°

Question 14

Of the following, only __________ appears to gain mass in a magnetic field.

Accepted Answer

A) C2 
B) N2 
C) F2 
D) O2 
E) Li2 
A) C2 
B) N2 
C) F2 
D) O2 
E) Li2

Question 15

The total number of π bonds in the H-C≡C-C≡C-C≡N molecule is __________.

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 9 
E) 12 
A) 3 
B) 4 
C) 6 
D) 9 
E) 12

Question 16

The hybridization of the central atom in the XeF4 molecule is __________.

Accepted Answer

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

Question 17

Of the molecules below, only __________ is polar.

Accepted Answer

A) SbF5 
B) AsH3 
C) I2 
D) SF6 
E) CH4 
A) SbF5 
B) AsH3 
C) I2 
D) SF6 
E) CH4

Question 18

The hybrid orbital set used by the central atom in NCl3 is __________.

Accepted Answer

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

Question 19

The bond angle marked a in the following molecule is about __________.

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60° 
A) 90° 
B) 109.5° 
C) 120° 
D) 180° 
E) 60°

Question 20

Using the VSEPR model, the molecular geometry of the central atom in BF3 is __________.

Accepted Answer

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

Exam 9: Molecular Geometry and Bonding Theories

In counting the electron domains around the central atom in VSEPR theory, a __________ is not included.

There are __________ σ and __________ π bonds in the H2C=CH2 molecule.

The hybridization of the carbon atom in carbon dioxide is __________.

An antibonding MO __________ the corresponding bonding MO.

In molecular orbital theory, the σ1s orbital is __________ and the σ1s* orbital is __________ in the H2 molecule.

The order of MO energies in B2, C2, and N2 (σ2p > π2p), is different from the order in O2, F2, and Ne2 (σ2p > π2p). This is due to __________.

In which of the molecules is the central atom sp3d2 hybridized?

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

The hybrid orbitals used for bonding by the sulfur atom in the SF4 molecule are __________ orbitals.

The Cl-Si-Cl bond angle in the SiCl2F2 molecule is approximately __________.

The molecular geometry of the SF6 molecule is __________, and this molecule is __________.

The basis of the VSEPR model of molecular bonding is __________.

The hybridization of the oxygen atom labeled y in the structure below is __________. The C-O-H bond angle is __________.

Of the following, only __________ appears to gain mass in a magnetic field.

The total number of π bonds in the H-C≡C-C≡C-C≡N molecule is __________.

The hybridization of the central atom in the XeF4 molecule is __________.

Of the molecules below, only __________ is polar.

The hybrid orbital set used by the central atom in NCl3 is __________.

The bond angle marked a in the following molecule is about __________.

Using the VSEPR model, the molecular geometry of the central atom in BF3 is __________.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

There are σ and π bonds in the H₂C=CH₂ molecule.

In molecular orbital theory, the σ_1s orbital is __________ and the σ_1s^* orbital is __________ in the H₂ molecule.

The order of MO energies in B₂, C₂, and N₂ (σ_2p > π_2p), is different from the order in O₂, F₂, and Ne₂ (σ_2p > π_2p). This is due to __________.

In which of the molecules is the central atom sp³d² hybridized?

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

The hybrid orbitals used for bonding by the sulfur atom in the SF₄ molecule are __________ orbitals.

The Cl-Si-Cl bond angle in the SiCl₂F₂ molecule is approximately __________.

The molecular geometry of the SF₆ molecule is , and this molecule is .

The hybridization of the oxygen atom labeled y in the structure below is . The C-O-H bond angle is .

The hybridization of the central atom in the XeF₄ molecule is __________.

The hybrid orbital set used by the central atom in NCl₃ is __________.

Using the VSEPR model, the molecular geometry of the central atom in BF₃ is __________.