Question 1

Which of the following is a bent (nonlinear) molecule?

Accepted Answer

A)  CO2 
B)  CS2 
C)  BeF2 
D)  OF2 
E)  XeF2 
A)  CO2 
B)  CS2 
C)  BeF2 
D)  OF2 
E)  XeF2

Question 2

The core electrons are called valence electrons.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is least likely to form multiple bonds?

Accepted Answer

A)  phosphorus 
B)  oxygen 
C)  nitrogen 
D)  carbon 
E)  barium 
A)  phosphorus 
B)  oxygen 
C)  nitrogen 
D)  carbon 
E)  barium

Question 4

The central atom is typically the atom with the highest electronegativity.

Accepted Answer

A) True 
 B)False

Question 5

After drawing the Lewis dot structure of HOClO2, pick the INCORRECT statement of the following.

Accepted Answer

A)  The oxygen bonded to the hydrogen has two lone pairs. 
B)  The oxygens not bonded to hydrogen have three lone pairs. 
C)  The O-Cl bonds are all double bonds. 
D)  The H-O bond is a single bond. 
E)  Chlorine has a full octet. 
A)  The oxygen bonded to the hydrogen has two lone pairs. 
B)  The oxygens not bonded to hydrogen have three lone pairs. 
C)  The O-Cl bonds are all double bonds. 
D)  The H-O bond is a single bond. 
E)  Chlorine has a full octet.

Question 6

Which of the following is diamagnetic?

Accepted Answer

A)  ClO2 
B)  NO 
C)  CO 
D)  NO2 
E)  CH3 
A)  ClO2 
B)  NO 
C)  CO 
D)  NO2 
E)  CH3

Question 7

Given the bond enthalpies C=O (707), O=O (498), H-O (464), and C-H (414) in kJ/mol, compute ΔH° in kJ/mol for: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g).

Accepted Answer

A)  +618 
B)  +259 
C)  -519 
D)  -618 
E)  -259 
A)  +618 
B)  +259 
C)  -519 
D)  -618 
E)  -259

Question 8

After drawing the Lewis dot structure of HC(O)OH, pick the INCORRECT statement from the following.

Accepted Answer

A)  The oxygen not also bonded to hydrogen has a double bond to carbon. 
B)  The carbon has a lone pair. 
C)  Both oxygens have two lone pairs. 
D)  The O-H bond is a single bond. 
E)  The C-H bond is a single bond. 
A)  The oxygen not also bonded to hydrogen has a double bond to carbon. 
B)  The carbon has a lone pair. 
C)  Both oxygens have two lone pairs. 
D)  The O-H bond is a single bond. 
E)  The C-H bond is a single bond.

Question 9

As indicated by Lewis structures, which of the following molecules would probably be unstable?

Accepted Answer

A)  NH3 
B)  N2H6 
C)  SF4 
D)  CH2F2 
E)  SiH4 
A)  NH3 
B)  N2H6 
C)  SF4 
D)  CH2F2 
E)  SiH4

Question 10

Given the bond enthalpies C-C (348), C=O (707), O=O (498), H-O (464), C- H (414) all in kJ/mol, compute ΔH° kJ/mol for the complete combustion of C7H16.

Accepted Answer

A)  -3.13 × 103 kJ/mol 
B)  -2.93 × 103 kJ/mol 
C)  -2.57 × 103 kJ/mol 
D)  -2.43 × 103 kJ/mol 
E)  +2.57 × 103 kJ/mol 
A)  -3.13 × 103 kJ/mol 
B)  -2.93 × 103 kJ/mol 
C)  -2.57 × 103 kJ/mol 
D)  -2.43 × 103 kJ/mol 
E)  +2.57 × 103 kJ/mol

Question 11

After drawing the Lewis dot structure of CH2CCl2, pick the INCORRECT statement of the following.

Accepted Answer

A)  The C-C bond is a double bond. 
B)  The H-C bonds are single bonds. 
C)  The Cl-C bonds are single bonds. 
D)  Each carbon has a lone pair. 
E)  Each chlorine has three lone pairs. 
A)  The C-C bond is a double bond. 
B)  The H-C bonds are single bonds. 
C)  The Cl-C bonds are single bonds. 
D)  Each carbon has a lone pair. 
E)  Each chlorine has three lone pairs.

Question 12

Choose the INCORRECT statement.

Accepted Answer

A)  Molecules with all paired electrons are diamagnetic. 
B)  Highly reactive molecular fragments with unpaired electrons are free radicals. 
C)  An expanded octet has larger electron clouds. 
D)  Electron pairs repel each other. 
E)  VSEPR stands for valence-shell electron pair repulsion. 
A)  Molecules with all paired electrons are diamagnetic. 
B)  Highly reactive molecular fragments with unpaired electrons are free radicals. 
C)  An expanded octet has larger electron clouds. 
D)  Electron pairs repel each other. 
E)  VSEPR stands for valence-shell electron pair repulsion.

Question 13

After drawing the Lewis dot structure for PCl3, determine the number of single bonds, double bonds, and lone pairs on the central atom.

Accepted Answer

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

Question 14

What is the formal charge on carbon in the bicarbonate ion (HOCO2)?

Accepted Answer

A)  +2 
B)  -2 
C)  +1 
D)  -1 
E)  0 
A)  +2 
B)  -2 
C)  +1 
D)  -1 
E)  0

Question 15

In a Lewis structure, the number of valence electrons shown is one less for each negative charge.

Accepted Answer

A) True 
 B)False

Question 16

Given the listed bond lengths, what would be the most reasonable estimate for the carbon-oxygen bond length in carbon dioxide? C-C/154 pm C=C/120 pm C-O/143 pm O-O/145 pm O=O/121 pm

Accepted Answer

A)  ca. 120 pm 
B)  ca. 130 pm 
C)  ca. 140 pm 
D)  ca. 150 pm 
E)  > 150 pm 
A)  ca. 120 pm 
B)  ca. 130 pm 
C)  ca. 140 pm 
D)  ca. 150 pm 
E)  > 150 pm

Question 17

What is the correct molecular geometry for SeBr3+?

Accepted Answer

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

Question 18

In which of the following molecules would you expect the nitrogen-to-nitrogen bond to be the shortest?

Accepted Answer

A)  N2H4 
B)  N2 
C)  N2O4 
D)  N2O 
E)  NH3 
A)  N2H4 
B)  N2 
C)  N2O4 
D)  N2O 
E)  NH3

Question 19

How many "dots" should be shown in the Lewis symbol for phosphorus?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  8 
E)  10 
A)  1 
B)  3 
C)  5 
D)  8 
E)  10

Question 20

Choose the INCORRECT statement.

Accepted Answer

A)  In a Lewis structure, the number of valence electrons shown is one more for each negative charge. 
B)  The central atom is typically the atom with the highest electronegativity. 
C)  One atom supplies both electrons for a coordinate covalent bond. 
D)  Formal charges are apparent charges associated with atoms in a Lewis structure. 
E)  Resonance is when more than one plausible structure can be written but the "correct" structure cannot be written. 
A)  In a Lewis structure, the number of valence electrons shown is one more for each negative charge. 
B)  The central atom is typically the atom with the highest electronegativity. 
C)  One atom supplies both electrons for a coordinate covalent bond. 
D)  Formal charges are apparent charges associated with atoms in a Lewis structure. 
E)  Resonance is when more than one plausible structure can be written but the "correct" structure cannot be written.

Exam 10: Chemical Bonding I: Basic Concepts

Which of the following is a bent (nonlinear) molecule?

The core electrons are called valence electrons.

Which of the following is least likely to form multiple bonds?

The central atom is typically the atom with the highest electronegativity.

After drawing the Lewis dot structure of HOClO2, pick the INCORRECT statement of the following.

Which of the following is diamagnetic?

Given the bond enthalpies C=O (707), O=O (498), H-O (464), and C-H (414) in kJ/mol, compute ΔH° in kJ/mol for: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g).

After drawing the Lewis dot structure of HC(O)OH, pick the INCORRECT statement from the following.

As indicated by Lewis structures, which of the following molecules would probably be unstable?

Given the bond enthalpies C-C (348), C=O (707), O=O (498), H-O (464), C- H (414) all in kJ/mol, compute ΔH° kJ/mol for the complete combustion of C7H16.

After drawing the Lewis dot structure of CH2CCl2, pick the INCORRECT statement of the following.

Choose the INCORRECT statement.

After drawing the Lewis dot structure for PCl3, determine the number of single bonds, double bonds, and lone pairs on the central atom.

What is the formal charge on carbon in the bicarbonate ion (HOCO2)?

In a Lewis structure, the number of valence electrons shown is one less for each negative charge.

Given the listed bond lengths, what would be the most reasonable estimate for the carbon-oxygen bond length in carbon dioxide? C-C/154 pm C=C/120 pm C-O/143 pm O-O/145 pm O=O/121 pm

What is the correct molecular geometry for SeBr3+?

In which of the following molecules would you expect the nitrogen-to-nitrogen bond to be the shortest?

How many "dots" should be shown in the Lewis symbol for phosphorus?

Choose the INCORRECT statement.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

After drawing the Lewis dot structure of HOClO₂, pick the INCORRECT statement of the following.

Given the bond enthalpies C=O (707), O=O (498), H-O (464), and C-H (414) in kJ/mol, compute ΔH° in kJ/mol for: CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g).

After drawing the Lewis dot structure of CH₂CCl₂, pick the INCORRECT statement of the following.

After drawing the Lewis dot structure for PCl₃, determine the number of single bonds, double bonds, and lone pairs on the central atom.

What is the formal charge on carbon in the bicarbonate ion (HOCO₂)?

What is the correct molecular geometry for SeBr₃⁺?