Question 1

The central atom in the ICl4- ion has ________ nonbonded electron pair(s)and ________ bonded electron pair(s)in its valence shell.

Accepted Answer

A) 4, 2 
B) 0, 4 
C) 2, 4 
D) 2, 2 
E) 6, 0 
A) 4, 2 
B) 0, 4 
C) 2, 4 
D) 2, 2 
E) 6, 0

Question 2

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas,O2.This is because ________.

Accepted Answer

A) the bond order in O2 can be shown to be equal to 2 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals 
C) the energy of the π2p MOs is higher than that of the σ2p MO 
D) there are two unpaired electrons in the MO electron configuration of O2 
E) the O-O bond distance is relatively short 
A) the bond order in O2 can be shown to be equal to 2 
B) there are more electrons in the bonding orbitals than in the antibonding orbitals 
C) the energy of the π2p MOs is higher than that of the σ2p MO 
D) there are two unpaired electrons in the MO electron configuration of O2 
E) the O-O bond distance is relatively short

Question 3

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 4

The molecular geometry of the CHF3 molecule is ________,and the molecule is ________.

Accepted Answer

A) trigonal pyramidal, polar 
B) tetrahedral, nonpolar 
C) seesaw, nonpolar 
D) tetrahedral, polar 
E) seesaw, polar 
A) trigonal pyramidal, polar 
B) tetrahedral, nonpolar 
C) seesaw, nonpolar 
D) tetrahedral, polar 
E) seesaw, polar

Question 5

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 6

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

Which of the following molecules would be considered nonpolar?

Accepted Answer

A) PF3 
B) Br2S 
C) BeH2 
D) TeCl2 
E) HCl 
A) PF3 
B) Br2S 
C) BeH2 
D) TeCl2 
E) HCl

Question 8

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 9

The central atom in a certain molecule has 1 nonbonded electron pairs and 2 bonded electron pairs in its valence shell.The molecular geometry of this molecule is ________.

Accepted Answer

A) tetrahedral 
B) bent 
C) seesaw 
D) trigonal bipyrimidal 
E) trigonal pyramidal 
A) tetrahedral 
B) bent 
C) seesaw 
D) trigonal bipyrimidal 
E) trigonal pyramidal

Question 10

The H-B-H bond angle in BH3 is ________.

Accepted Answer

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

Question 11

According to VSEPR theory,if there are three electron domains in the valence shell of an atom,they will be arranged in a(n)________ geometry.

Accepted Answer

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

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

The hybridizations of iodine in IF3 and IF5 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 14

The molecular geometry of the BrO3- ion is ________.

Accepted Answer

A) trigonal pyramidal 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) T-shaped 
A) trigonal pyramidal 
B) trigonal planar 
C) bent 
D) tetrahedral 
E) T-shaped

Question 15

The hybridization and molecular shape of the carbon atom in carbon dioxide is ________.

Accepted Answer

A) sp and linear 
B) sp3 and bent 
C) sp2 and linear 
D) sp2d and bent 
E) sp2d2 and linear 
A) sp and linear 
B) sp3 and bent 
C) sp2 and linear 
D) sp2d and bent 
E) sp2d2 and linear

Question 16

A molecular orbital can accommodate a maximum of ________ electron(s).

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) 12 
A) 1 
B) 2 
C) 4 
D) 6 
E) 12

Question 17

For which of the molecules is the molecular geometry (shape)the same as the VSEPR electron domain arrangement (electron domain geometry)?

Accepted Answer

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

Question 18

The molecular geometry consists of ________.
a.a nonbonding pair of electrons
b.a single bond
c.a multiple bond

Accepted Answer

A) a only 
B) b only 
C) c only 
D) a, b, and c 
E) b and c 
A) a only 
B) b only 
C) c only 
D) a, b, and c 
E) b and c

Question 19

Based on molecular orbital theory,the bond order of the N-N bond in the N2 molecule is ________.

Accepted Answer

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

Question 20

Of the molecules below,only ________ is polar.

Accepted Answer

A) CO2 
B) CH4 
C) PF5 
D) SnF3 
E) H2 
A) CO2 
B) CH4 
C) PF5 
D) SnF3 
E) H2

Exam 9: Molecular Geometry and Bonding Theories

The central atom in the ICl4- ion has ________ nonbonded electron pair(s)and ________ bonded electron pair(s)in its valence shell.

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas,O2.This is because ________.

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

The molecular geometry of the CHF3 molecule is ________,and the molecule is ________.

The angles between sp2 orbitals are ________.

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

Which of the following molecules would be considered nonpolar?

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

The central atom in a certain molecule has 1 nonbonded electron pairs and 2 bonded electron pairs in its valence shell.The molecular geometry of this molecule is ________.

The H-B-H bond angle in BH3 is ________.

According to VSEPR theory,if there are three electron domains in the valence shell of an atom,they will be arranged in a(n)________ geometry.

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

The hybridizations of iodine in IF3 and IF5 are ________ and ________,respectively.

The molecular geometry of the BrO3- ion is ________.

The hybridization and molecular shape of the carbon atom in carbon dioxide is ________.

A molecular orbital can accommodate a maximum of ________ electron(s).

For which of the molecules is the molecular geometry (shape)the same as the VSEPR electron domain arrangement (electron domain geometry)?

The molecular geometry consists of ________. a.a nonbonding pair of electrons b.a single bond c.a multiple bond

Based on molecular orbital theory,the bond order of the N-N bond in the N2 molecule is ________.

Of the molecules below,only ________ is polar.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

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 central atom in the ICl₄^- ion has nonbonded electron pair(s)and bonded electron pair(s)in its valence shell.

Molecular Orbital theory correctly predicts paramagnetism of oxygen gas,O₂.This is because ________.

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

The molecular geometry of the CHF₃ molecule is ,and the molecule is .

The angles between sp² orbitals are ________.

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

The H-B-H bond angle in BH₃ is ________.

The hybridizations of iodine in IF₃and IF₅ are and ,respectively.

The molecular geometry of the BrO₃^- ion is ________.

Based on molecular orbital theory,the bond order of the N-N bond in the N₂ molecule is ________.