Question 1

Which of the following exhibits ionic bonding?

Accepted Answer

A)  C2H6 
B)  Na2S 
C)  H2CO 
D)  SiCl4 
E)  SF4 
A)  C2H6 
B)  Na2S 
C)  H2CO 
D)  SiCl4 
E)  SF4

Question 2

Given the bond enthalpies C-O (360), C=O (707), O=O (498), H-O (464), C- H (414), all in kJ/mol, estimate ΔH for the following reaction: CH3OCH3(g) + 3 O2(g) → 2 CO2(g) + 3 H2O(g).

Accepted Answer

A)  -2332 kJ 
B)  -242 kJ 
C)  870 kJ 
D)  -2106 kJ 
E)  -914 kJ 
A)  -2332 kJ 
B)  -242 kJ 
C)  870 kJ 
D)  -2106 kJ 
E)  -914 kJ

Question 3

Choose the INCORRECT statement.

Accepted Answer

A)  Bonds between like atoms are nonpolar bonds. 
B)  Polar bonds are caused by the bonding pair of electrons being attracted more to one atom than the other. 
C)  Electronegativity is the ability of an atom to attract electrons when involved in a bond. 
D)  A difference in electronegativity between two atoms causes a polar bond. 
E)  If the ΔEN value is large the bond is polar covalent. 
A)  Bonds between like atoms are nonpolar bonds. 
B)  Polar bonds are caused by the bonding pair of electrons being attracted more to one atom than the other. 
C)  Electronegativity is the ability of an atom to attract electrons when involved in a bond. 
D)  A difference in electronegativity between two atoms causes a polar bond. 
E)  If the ΔEN value is large the bond is polar covalent.

Question 4

Which of the following molecules contains polar bonds but has a zero dipole moment?

Accepted Answer

A)  N2 
B)  NH3 
C)  CO2 
D)  CH3Cl 
E)  BrCl 
A)  N2 
B)  NH3 
C)  CO2 
D)  CH3Cl 
E)  BrCl

Question 5

Choose the INCORRECT statement.

Accepted Answer

A)  The geometrical distribution of electron groups is the electron-group geometry. 
B)  The geometrical arrangement of the atomic nuclei is the molecular geometry. 
C)  A polar molecule has a dipole moment. 
D)  A dipole moment is the product of the number of atoms and the charge. 
E)  A nonpolar molecule can have polar bonds. 
A)  The geometrical distribution of electron groups is the electron-group geometry. 
B)  The geometrical arrangement of the atomic nuclei is the molecular geometry. 
C)  A polar molecule has a dipole moment. 
D)  A dipole moment is the product of the number of atoms and the charge. 
E)  A nonpolar molecule can have polar bonds.

Question 6

After drawing the Lewis dot structure for CO2, determine the number of single bonds, double bonds, and lone pairs on the central atom.

Accepted Answer

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

Question 7

Write a Lewis structure for potassium oxide.

Accepted Answer

A)    
B)  K-O 
C)  K-O-K 
D)    
E)    
A)    
B)  K-O 
C)  K-O-K 
D)    
E)

Question 8

An expanded octet may occur:

Accepted Answer

A)  in the 1st and 2nd period only 
B)  in families IA, IIA, and IIIA only 
C)  anywhere except period 1 and 2 
D)  in all families except IA 
E)  in the 3rd and 4th period only 
A)  in the 1st and 2nd period only 
B)  in families IA, IIA, and IIIA only 
C)  anywhere except period 1 and 2 
D)  in all families except IA 
E)  in the 3rd and 4th period only

Question 9

A chemical bond for which one of the bonded atoms provides both electrons for the bond is referred to as a coordinate covalent bond

Accepted Answer

A) True 
 B)False

Question 10

Which of the following sets contains only linear molecules?

Accepted Answer

A)  CO2, HCN, O2 
B)  H2S, HCN, CO2 
C)  H2O, CO, Cl2 
D)  H2S, CO, CO2 
E)  BF3, Cl2, O2 
A)  CO2, HCN, O2 
B)  H2S, HCN, CO2 
C)  H2O, CO, Cl2 
D)  H2S, CO, CO2 
E)  BF3, Cl2, O2

Question 11

Covalent bonds are formed by atoms sharing electrons.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is diamagnetic?

Accepted Answer

A)  N2 
B)  O2- 
C)  SO2+ 
D)  O2 
E)  NO2 
A)  N2 
B)  O2- 
C)  SO2+ 
D)  O2 
E)  NO2

Question 13

Bonds between like atoms are nonpolar bonds.

Accepted Answer

A) True 
 B)False

Question 14

After drawing the Lewis dot structure for XeCl4, determine the number of single bonds, double bonds, and lone pairs on the central atom.

Accepted Answer

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

Question 15

Which of the following exhibits covalent bonding?

Accepted Answer

A)  NaF 
B)  SrO 
C)  LiH 
D)  OF2 
E)  K2S 
A)  NaF 
B)  SrO 
C)  LiH 
D)  OF2 
E)  K2S

Question 16

Choose the INCORRECT statement.

Accepted Answer

A)  The core electrons are called valence electrons. 
B)  Ionic bonds are formed by the attraction between cations and anions. 
C)  Ionic bonds are formed from atoms by a transfer of electrons. 
D)  Covalent bonds are formed by atoms sharing electrons. 
E)  An octet is 8 outer-shell electrons. 
A)  The core electrons are called valence electrons. 
B)  Ionic bonds are formed by the attraction between cations and anions. 
C)  Ionic bonds are formed from atoms by a transfer of electrons. 
D)  Covalent bonds are formed by atoms sharing electrons. 
E)  An octet is 8 outer-shell electrons.

Question 17

Choose the groups of molecules below in which all the molecules have a net dipole moment.

Accepted Answer

A)  SiHCl3, O2, H2O 
B)  HF, H2C=CH2, H2O 
C)  HF, CH3Cl, H2O 
D)  CCl4, HCl, NH3 
E)  HF, H2O, N2 
A)  SiHCl3, O2, H2O 
B)  HF, H2C=CH2, H2O 
C)  HF, CH3Cl, H2O 
D)  CCl4, HCl, NH3 
E)  HF, H2O, N2

Exam 10: Chemical Bonding I: Basic Concepts

Which of the following exhibits ionic bonding?

Given the bond enthalpies C-O (360), C=O (707), O=O (498), H-O (464), C- H (414), all in kJ/mol, estimate ΔH for the following reaction: CH3OCH3(g) + 3 O2(g) → 2 CO2(g) + 3 H2O(g).

Choose the INCORRECT statement.

Which of the following molecules contains polar bonds but has a zero dipole moment?

Choose the INCORRECT statement.

After drawing the Lewis dot structure for CO2, determine the number of single bonds, double bonds, and lone pairs on the central atom.

Write a Lewis structure for potassium oxide.

An expanded octet may occur:

A chemical bond for which one of the bonded atoms provides both electrons for the bond is referred to as a coordinate covalent bond

Which of the following sets contains only linear molecules?

Covalent bonds are formed by atoms sharing electrons.

Which of the following is diamagnetic?

Bonds between like atoms are nonpolar bonds.

After drawing the Lewis dot structure for XeCl4, determine the number of single bonds, double bonds, and lone pairs on the central atom.

Which of the following exhibits covalent bonding?

Choose the INCORRECT statement.

Choose the groups of molecules below in which all the molecules have a net dipole moment.

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

Given the bond enthalpies C-O (360), C=O (707), O=O (498), H-O (464), C- H (414), all in kJ/mol, estimate ΔH for the following reaction: CH₃OCH₃(g) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(g).

After drawing the Lewis dot structure for CO₂, determine the number of single bonds, double bonds, and lone pairs on the central atom.

After drawing the Lewis dot structure for XeCl₄, determine the number of single bonds, double bonds, and lone pairs on the central atom.