Question 1

Based on molecular orbital theory, the only molecule in the list below that has unpaired electrons is __________.

Accepted Answer

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

Question 2

The electron-domain geometry of the AsF6- ion is octahedral. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

Accepted Answer

A) sp2d2 
B) sp3 
C) sp3d 
D) sp3d2 
E) sp2 
A) sp2d2 
B) sp3 
C) sp3d 
D) sp3d2 
E) sp2

Question 3

The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn are __________.

Accepted Answer

A) never the same 
B) always the same 
C) sometimes the same 
D) not related 
E) mirror images of one another 
A) never the same 
B) always the same 
C) sometimes the same 
D) not related 
E) mirror images of one another

Question 4

XeF4 is a polar molecule.

Accepted Answer

A) True 
 B)False

Question 5

Based on molecular orbital theory, the bond order of the H-H bond in the H2+ ion is __________.

Accepted Answer

A) 0 
B) 1/2 
C) 1 
D) 3/2 
E) 2 
A) 0 
B) 1/2 
C) 1 
D) 3/2 
E) 2

Question 6

Hybridization is the process of mixing atomic orbitals as atoms approach each other to form a bond.

Accepted Answer

A) True 
 B)False

Question 7

ClF3 has "T-shaped" geometry. There are __________ non-bonding domains in this molecule.

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 8

The bond order of a homonuclear diatomic molecule can be decreased by __________.

Accepted Answer

A) removing electrons from a bonding MO or adding electrons to an antibonding MO 
B) adding electrons to a bonding MO or removing electrons from an antibonding MO 
C) adding electrons to any MO 
D) removing electrons from any MO 
E) The bond order of a homonuclear diatomic molecule cannot be decreased by any means. 
A) removing electrons from a bonding MO or adding electrons to an antibonding MO 
B) adding electrons to a bonding MO or removing electrons from an antibonding MO 
C) adding electrons to any MO 
D) removing electrons from any MO 
E) The bond order of a homonuclear diatomic molecule cannot be decreased by any means.

Question 9

The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is __________.

Accepted Answer

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

Question 10

A covalent bond in which overlap regions lie above and below an internuclear axis is called a(n)__________.

Accepted Answer

The answer of A covalent bond in which overlap regions...

Question 11

The bond angles marked a, b, and c in the molecule below are about __________, __________, and __________, respectively.

Accepted Answer

A) 90°, 90°, 90° 
B) 120°, 120°, 90° 
C) 120°, 120°, 109.5° 
D) 109.5°, 120°, 109.5° 
E) 109.5°, 90°, 120° 
A) 90°, 90°, 90° 
B) 120°, 120°, 90° 
C) 120°, 120°, 109.5° 
D) 109.5°, 120°, 109.5° 
E) 109.5°, 90°, 120°

Question 12

The Lewis structure of carbon dioxide is given below. The hybridization of the carbon atom in carbon dioxide is __________.

Accepted Answer

A) sp3 
B) sp2 
C) sp 
D) sp2d 
E) sp2d2 
A) sp3 
B) sp2 
C) sp 
D) sp2d 
E) sp2d2

Question 13

PCl5 has __________ electron domains and a __________ molecular arrangement.

Accepted Answer

A) 6, trigonal bipyramidal 
B) 6, tetrahedral 
C) 5, square pyramidal 
D) 5, trigonal bipyramidal 
E) 6, seesaw 
A) 6, trigonal bipyramidal 
B) 6, tetrahedral 
C) 5, square pyramidal 
D) 5, trigonal bipyramidal 
E) 6, seesaw

Question 14

The O-C-O bond angle in the CO32- ion 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 15

Nitrogen is colorless because the minimum energy to excite an electron is in the ultraviolet section of the spectrum.

Accepted Answer

A) True 
 B)False

Question 16

The angles between sp2 orbitals are __________.

Accepted Answer

A) 45° 
B) 180° 
C) 90° 
D) 109.5° 
E) 120° 
A) 45° 
B) 180° 
C) 90° 
D) 109.5° 
E) 120°

Question 17

The hybridizations of nitrogen in NF3 and NH3 are __________ and __________, respectively.

Accepted Answer

A) sp2, sp2 
B) sp, sp3 
C) sp3, sp 
D) sp3, sp3 
E) sp2, sp3 
A) sp2, sp2 
B) sp, sp3 
C) sp3, sp 
D) sp3, sp3 
E) sp2, sp3

Question 18

The hybridizations of bromine in BrF5 and of arsenic in AsF5 are __________ and __________, respectively.

Accepted Answer

A) sp3, sp3d 
B) sp3d, sp3d2 
C) sp3d, sp3 
D) sp3d2, sp3d 
E) sp3d2, sp3d2 
A) sp3, sp3d 
B) sp3d, sp3d2 
C) sp3d, sp3 
D) sp3d2, sp3d 
E) sp3d2, sp3d2

Question 19

The hybridization of nitrogen in the H-CN: molecule is __________.

Accepted Answer

A) sp 
B) s2p 
C) s3p 
D) sp2 
E) sp3 
A) sp 
B) s2p 
C) s3p 
D) sp2 
E) sp3

Question 20

The bond angles in a trigonal bipyramidal molecule are __________ degrees.

Accepted Answer

A) 120 
B) 109.5 
C) 180 
D) 45 
E) <45 
A) 120 
B) 109.5 
C) 180 
D) 45 
E) <45

Exam 9: Molecular Geometry and Bonding Theories

Based on molecular orbital theory, the only molecule in the list below that has unpaired electrons is __________.

The electron-domain geometry of the AsF6- ion is octahedral. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

The electron-domain geometry and the molecular geometry of a molecule of the general formula ABn are __________.

XeF4 is a polar molecule.

Based on molecular orbital theory, the bond order of the H-H bond in the H2+ ion is __________.

Hybridization is the process of mixing atomic orbitals as atoms approach each other to form a bond.

ClF3 has "T-shaped" geometry. There are __________ non-bonding domains in this molecule.

The bond order of a homonuclear diatomic molecule can be decreased by __________.

The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is __________.

A covalent bond in which overlap regions lie above and below an internuclear axis is called a(n)__________.

The bond angles marked a, b, and c in the molecule below are about __________, __________, and __________, respectively.

The Lewis structure of carbon dioxide is given below. The hybridization of the carbon atom in carbon dioxide is __________.

PCl5 has __________ electron domains and a __________ molecular arrangement.

The O-C-O bond angle in the CO32- ion is approximately __________.

Nitrogen is colorless because the minimum energy to excite an electron is in the ultraviolet section of the spectrum.

The angles between sp2 orbitals are __________.

The hybridizations of nitrogen in NF3 and NH3 are __________ and __________, respectively.

The hybridizations of bromine in BrF5 and of arsenic in AsF5 are __________ and __________, respectively.

The hybridization of nitrogen in the H-CN: molecule is __________.

The bond angles in a trigonal bipyramidal molecule are __________ degrees.

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

The electron-domain geometry of the AsF₆^- ion is octahedral. The hybrid orbitals used by the As atom for bonding are __________ orbitals.

The electron-domain geometry and the molecular geometry of a molecule of the general formula AB_n are __________.

XeF₄ is a polar molecule.

Based on molecular orbital theory, the bond order of the H-H bond in the H₂⁺ ion is __________.

ClF₃ has "T-shaped" geometry. There are __________ non-bonding domains in this molecule.

The hybridization of orbitals on the central atom in a molecule is sp². The electron-domain geometry about this central atom is __________.

The bond angles marked a, b, and c in the molecule below are about , , and __, respectively.

PCl₅ has electron domains and a molecular arrangement.

The O-C-O bond angle in the CO₃^2- ion is approximately __________.

The angles between sp² orbitals are __________.

The hybridizations of nitrogen in NF₃ and NH₃ are and , respectively.

The hybridizations of bromine in BrF₅ and of arsenic in AsF₅ are and , respectively.