Question 1

For resonance forms of a molecule or ion, ________.

Accepted Answer

A) one always corresponds to the observed structure 
B) all the resonance structures are observed in various proportions 
C) the observed structure is an average of the resonance forms 
D) the same atoms need not be bonded to each other in all resonance forms 
E) there cannot be more than two resonance structures for a given species 
A) one always corresponds to the observed structure 
B) all the resonance structures are observed in various proportions 
C) the observed structure is an average of the resonance forms 
D) the same atoms need not be bonded to each other in all resonance forms 
E) there cannot be more than two resonance structures for a given species

Question 2

The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively.

Accepted Answer

A) 7, 4, and 6 
B) 1, 5, and 7 
C) 8, 2, and 3 
D) 7, 1, and 2 
E) 2, 7, and 4 
A) 7, 4, and 6 
B) 1, 5, and 7 
C) 8, 2, and 3 
D) 7, 1, and 2 
E) 2, 7, and 4

Question 3

Based on the octet rule, aluminum most likely forms an ________ ion.

Accepted Answer

A) Al3+ 
B) Al4+ 
C) Al4- 
D) Al+ 
E) Al- 
A) Al3+ 
B) Al4+ 
C) Al4- 
D) Al+ 
E) Al-

Question 4

What is the electron configuration for the Co2+ ion?

Accepted Answer

A) [Ar]4s13d6 
B) [Ar]3d7 
C) [Ar]3d5 
D) [Ar]4s23d9 
E) [Ne]3s23p10 
A) [Ar]4s13d6 
B) [Ar]3d7 
C) [Ar]3d5 
D) [Ar]4s23d9 
E) [Ne]3s23p10

Question 5

In some molecules and polyatomic ions, the sum of the valence electrons is odd and as a result the octet rule fails.

Accepted Answer

A) True 
 B)False

Question 6

In the nitrite ion (NO2-), ________.

Accepted Answer

A) both bonds are single bonds 
B) both bonds are double bonds 
C) one bond is a double bond and the other is a single bond 
D) both bonds are the same 
E) there are 20 valence electrons 
A) both bonds are single bonds 
B) both bonds are double bonds 
C) one bond is a double bond and the other is a single bond 
D) both bonds are the same 
E) there are 20 valence electrons

Question 7

Calculate the bond energy of C-F given that the heat of atomization of CHFClBr is 1502 kJ/mol, and that the bond energies of C-H, C-Br, and C-Cl are 413, 276, and 328 kJ/mol, respectively.

Accepted Answer

ΔH_atomiztion = [D(C-H) + D(C-F) + D(C-Cl

Question 8

For a given arrangement of ions, the lattice energy decreases as ionic radius ________ and as ionic charge ________.

Accepted Answer

A) decreases, increases 
B) increases, decreases 
C) increases, increases 
D) decreases, decreases 
E) This cannot be predicted. 
A) decreases, increases 
B) increases, decreases 
C) increases, increases 
D) decreases, decreases 
E) This cannot be predicted.

Question 9

The oxide of which of the following metals should have the greatest lattice energy?

Accepted Answer

A) calcium 
B) strontium 
C) magnesium 
D) beryllium 
E) barium 
A) calcium 
B) strontium 
C) magnesium 
D) beryllium 
E) barium

Question 10

Using the table of average bond energies below, the ΔH for the reaction is ________ kJ.   Bond: C≡C C-C H-I C-I C-H D (kJ/mol): 839 348 299 240 413

Accepted Answer

A) +160 
B) -160 
C) -217 
D) -63 
E) +63 
A) +160 
B) -160 
C) -217 
D) -63 
E) +63

Question 11

What is the maximum number of triple bonds that a carbon atom can form?

Accepted Answer

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

Question 12

A double bond consists of ________ pairs of electrons shared between two atoms.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 6 
A) 1 
B) 2 
C) 3 
D) 4 
E) 6

Question 13

Of the atoms below, ________ is the least electronegative.

Accepted Answer

A) B 
B) F 
C) C 
D) N 
E) O 
A) B 
B) F 
C) C 
D) N 
E) O

Question 14

As the number of covalent bonds between two atoms increases, the distance between the atoms ________ and the strength of the bond between them ________.

Accepted Answer

A) increases, increases 
B) decreases, decreases 
C) increases, decreases 
D) decreases, increases 
E) is unpredictable 
A) increases, increases 
B) decreases, decreases 
C) increases, decreases 
D) decreases, increases 
E) is unpredictable

Question 15

The ion NO- has ________ valence electrons.

Accepted Answer

A) 15 
B) 14 
C) 16 
D) 10 
E) 12 
A) 15 
B) 14 
C) 16 
D) 10 
E) 12

Question 16

Resonance structures differ by ________.

Accepted Answer

A) number and placement of electrons 
B) number of electrons only 
C) placement of atoms only 
D) number of atoms only 
E) placement of electrons only 
A) number and placement of electrons 
B) number of electrons only 
C) placement of atoms only 
D) number of atoms only 
E) placement of electrons only

Question 17

There are ________ unpaired electrons in the Lewis symbol for an oxygen atom.

Accepted Answer

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

Question 18

The type of compound that is most likely to contain a covalent bond is ________.

Accepted Answer

A) one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table 
B) a solid metal 
C) one that is composed of only nonmetals 
D) held together by the electrostatic forces between oppositely charged ions 
E) There is no general rule to predict covalency in bonds. 
A) one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table 
B) a solid metal 
C) one that is composed of only nonmetals 
D) held together by the electrostatic forces between oppositely charged ions 
E) There is no general rule to predict covalency in bonds.

Question 19

Which halogen, bromine or iodine, will form the more polar bond with phosphorus?

Accepted Answer

The answer of Which halogen, bromine or iodine, will form...

Question 20

Of the bonds C-N, C   N, and C≡N, the C-N bond is ________.

Accepted Answer

A) strongest/shortest 
B) strongest/longest 
C) weakest/shortest 
D) weakest/longest 
E) intermediate in both strength and length 
A) strongest/shortest 
B) strongest/longest 
C) weakest/shortest 
D) weakest/longest 
E) intermediate in both strength and length

Exam 8: Basic Concepts of Chemical Bonding

For resonance forms of a molecule or ion, ________.

The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively.

Based on the octet rule, aluminum most likely forms an ________ ion.

What is the electron configuration for the Co2+ ion?

In some molecules and polyatomic ions, the sum of the valence electrons is odd and as a result the octet rule fails.

In the nitrite ion (NO2-), ________.

Calculate the bond energy of C-F given that the heat of atomization of CHFClBr is 1502 kJ/mol, and that the bond energies of C-H, C-Br, and C-Cl are 413, 276, and 328 kJ/mol, respectively.

For a given arrangement of ions, the lattice energy decreases as ionic radius ________ and as ionic charge ________.

The oxide of which of the following metals should have the greatest lattice energy?

Using the table of average bond energies below, the ΔH for the reaction is ________ kJ. Bond: C≡C C-C H-I C-I C-H D (kJ/mol): 839 348 299 240 413

What is the maximum number of triple bonds that a carbon atom can form?

A double bond consists of ________ pairs of electrons shared between two atoms.

Of the atoms below, ________ is the least electronegative.

As the number of covalent bonds between two atoms increases, the distance between the atoms ________ and the strength of the bond between them ________.

The ion NO- has ________ valence electrons.

Resonance structures differ by ________.

There are ________ unpaired electrons in the Lewis symbol for an oxygen atom.

The type of compound that is most likely to contain a covalent bond is ________.

Which halogen, bromine or iodine, will form the more polar bond with phosphorus?

Of the bonds C-N, C N, and C≡N, the C-N bond 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

Molecular Geometry and Bonding Theories

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

What is the electron configuration for the Co²⁺ ion?

In the nitrite ion (NO₂^-), ________.

For a given arrangement of ions, the lattice energy decreases as ionic radius and as ionic charge .

As the number of covalent bonds between two atoms increases, the distance between the atoms and the strength of the bond between them .

The ion NO^- has ________ valence electrons.