Question 1

The valence-bond method provides energy information about molecules.

Accepted Answer

A) True 
 B)False

Question 2

A junction in a photovoltaic (solar) cell is which of the following?

Accepted Answer

A)  a thin layer of n-type semiconductor in contact with a p-type semiconductor 
B)  three pieces of semiconductor that form a p-n-p connection 
C)  wires that carry electricity that are attached to the cell 
D)  pure germanium that is attached to a p-type semiconductor 
E)  a thin layer of p-type semiconductor in contact with an n-type semiconductor 
A)  a thin layer of n-type semiconductor in contact with a p-type semiconductor 
B)  three pieces of semiconductor that form a p-n-p connection 
C)  wires that carry electricity that are attached to the cell 
D)  pure germanium that is attached to a p-type semiconductor 
E)  a thin layer of p-type semiconductor in contact with an n-type semiconductor

Question 3

What are the ideal bond angles for H2O?

Accepted Answer

A)  120° 
B)  109.5° 
C)  90° 
D)  180° 
E)  75° 
A)  120° 
B)  109.5° 
C)  90° 
D)  180° 
E)  75°

Question 4

According to MO theory, all of the following have a bond order of 2 EXCEPT:

Accepted Answer

A)  NO 
B)  CN+ 
C)  C2 
D)  O2 
A)  NO 
B)  CN+ 
C)  C2 
D)  O2

Question 5

The octahedral hybrid configuration is composed of which orbital combination?

Accepted Answer

A)  sp3d2 
B)  sp2d3 
C)  spd2 
D)  sp3d 
E)  sp3 
A)  sp3d2 
B)  sp2d3 
C)  spd2 
D)  sp3d 
E)  sp3

Question 6

According to principles of VSEPR theory applied on AsCl52-, which of the following is INCORRECT?

Accepted Answer

A)  VSEPR formula = AX5E 
B)  molecular geometry = square planar 
C)  electron pair geometry = octahedral 
D)  hybridization = sp3d2 
E)  one lone pair and 5 bonding pairs 
A)  VSEPR formula = AX5E 
B)  molecular geometry = square planar 
C)  electron pair geometry = octahedral 
D)  hybridization = sp3d2 
E)  one lone pair and 5 bonding pairs

Question 7

Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

Accepted Answer

A)  sp3/Al and H 
B)  sp2/B and F 
C)  sp/C and H 
D)  sp2/N and O 
E)  sp3/O and F 
A)  sp3/Al and H 
B)  sp2/B and F 
C)  sp/C and H 
D)  sp2/N and O 
E)  sp3/O and F

Question 8

What would be the hybridization of the N in the benzene-like molecule (C5H5N)?

Accepted Answer

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

Question 9

Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule.)

Accepted Answer

A)  CO2, CH4 
B)  H2CO, BeH2 
C)  BCl3, HNO 
D)  H2O, HF 
E)  NH3, HNO 
A)  CO2, CH4 
B)  H2CO, BeH2 
C)  BCl3, HNO 
D)  H2O, HF 
E)  NH3, HNO

Question 10

Choose the INCORRECT statement about AsF6-.

Accepted Answer

A)  The hybridization is sp3d2. 
B)  The molecule is octahedral. 
C)  There are no π bonds. 
D)  There is one lone pair of electrons. 
E)  There are six σ bonds. 
A)  The hybridization is sp3d2. 
B)  The molecule is octahedral. 
C)  There are no π bonds. 
D)  There is one lone pair of electrons. 
E)  There are six σ bonds.

Question 11

Which of the following statements about extrinsic semiconductors is INCORRECT?

Accepted Answer

A)  They are generally made from pure Si or Ge with small amounts of impurities. 
B)  n-type are those in which the impurity is an element of Group 15. 
C)  p-type are those in which the impurity is an element of Group 13. 
D)  The crystal need not be very pure before the impurity is added to produce the semiconductor. 
E)  Boron is a common impurity in n-type extrinsic semiconductors. 
A)  They are generally made from pure Si or Ge with small amounts of impurities. 
B)  n-type are those in which the impurity is an element of Group 15. 
C)  p-type are those in which the impurity is an element of Group 13. 
D)  The crystal need not be very pure before the impurity is added to produce the semiconductor. 
E)  Boron is a common impurity in n-type extrinsic semiconductors.

Question 12

Which statement is correct for the structure shown?

Accepted Answer

A)  Carbon no. 1 is described by sp3 hybridization. 
B)  The molecule contains 19 σ bonds. 
C)  Carbon no. 2 is described by sp2 hybridization. 
D)  The molecule contains a total of five π bonds. 
E)  Carbon no. 7 is described by sp hybridization. 
A)  Carbon no. 1 is described by sp3 hybridization. 
B)  The molecule contains 19 σ bonds. 
C)  Carbon no. 2 is described by sp2 hybridization. 
D)  The molecule contains a total of five π bonds. 
E)  Carbon no. 7 is described by sp hybridization.

Question 13

What is the hybridization of the Xe atom in XeF2?

Accepted Answer

A)  sp3d 
B)  sp 
C)  sp3 
D)  sp2 
A)  sp3d 
B)  sp 
C)  sp3 
D)  sp2

Question 14

For the molecule

Accepted Answer

A)  the hybridization for C is sp3 
B)  the hybridization for N is sp2 
C)  the hybridization for O is sp3 
D)  N is not hybridized 
E)  the hybridization for C is sp2 
A)  the hybridization for C is sp3 
B)  the hybridization for N is sp2 
C)  the hybridization for O is sp3 
D)  N is not hybridized 
E)  the hybridization for C is sp2

Question 15

According to the band theory of bonding, the smallest energy difference between a conduction band and a valence band typically occurs in substances such as:

Accepted Answer

A)  crystalline rock salt 
B)  crystalline rubidium 
C)  crystalline silicon 
D)  crystalline iodine 
E)  crystalline arsenic 
A)  crystalline rock salt 
B)  crystalline rubidium 
C)  crystalline silicon 
D)  crystalline iodine 
E)  crystalline arsenic

Question 16

Band theory describes the properties of metals and insulators but not semiconductors.

Accepted Answer

A) True 
 B)False

Question 17

The three molecular shapes an sp3 hybridized molecule can have are ________.

Accepted Answer

A)  triangular, bent, T-shaped 
B)  irregular tetrahedron, T-shaped, linear 
C)  octahedron, square pyramid, square planar 
D)  tetrahedron, trigonal pyramid, bent 
E)  tetrahedron, T-shaped, bent 
A)  triangular, bent, T-shaped 
B)  irregular tetrahedron, T-shaped, linear 
C)  octahedron, square pyramid, square planar 
D)  tetrahedron, trigonal pyramid, bent 
E)  tetrahedron, T-shaped, bent

Question 18

Which of the following statements is INCORRECT?

Accepted Answer

A)  Delocalized pi orbitals are formed when electrons are shared by unhybridized p orbitals in more than two atoms. 
B)  The band theory is a form of molecular orbital theory. 
C)  In band theory, there are two bands. 
D)  The valence band is at higher energy than the conduction band. 
E)  An energy band partially filled with electrons is a conduction band. 
A)  Delocalized pi orbitals are formed when electrons are shared by unhybridized p orbitals in more than two atoms. 
B)  The band theory is a form of molecular orbital theory. 
C)  In band theory, there are two bands. 
D)  The valence band is at higher energy than the conduction band. 
E)  An energy band partially filled with electrons is a conduction band.

Question 19

Molecular orbitals are formed by adding and subtracting atomic orbitals.

Accepted Answer

A) True 
 B)False

Question 20

Choose the INCORRECT statement about H3O+.

Accepted Answer

A)  There is one π bond. 
B)  There are 3 σ bonds. 
C)  There is one lone pair on O. 
D)  The hybridization on O is sp3. 
E)  The OH bonds are O(sp3) - H(1s). 
A)  There is one π bond. 
B)  There are 3 σ bonds. 
C)  There is one lone pair on O. 
D)  The hybridization on O is sp3. 
E)  The OH bonds are O(sp3) - H(1s).

Exam 11: Chemical Bonding II: Additional Aspects

The valence-bond method provides energy information about molecules.

A junction in a photovoltaic (solar) cell is which of the following?

What are the ideal bond angles for H2O?

According to MO theory, all of the following have a bond order of 2 EXCEPT:

The octahedral hybrid configuration is composed of which orbital combination?

According to principles of VSEPR theory applied on AsCl52-, which of the following is INCORRECT?

Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

What would be the hybridization of the N in the benzene-like molecule (C5H5N)?

Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule.)

Choose the INCORRECT statement about AsF6-.

Which of the following statements about extrinsic semiconductors is INCORRECT?

Which statement is correct for the structure shown?

What is the hybridization of the Xe atom in XeF2?

For the molecule

According to the band theory of bonding, the smallest energy difference between a conduction band and a valence band typically occurs in substances such as:

Band theory describes the properties of metals and insulators but not semiconductors.

The three molecular shapes an sp3 hybridized molecule can have are ________.

Which of the following statements is INCORRECT?

Molecular orbitals are formed by adding and subtracting atomic orbitals.

Choose the INCORRECT statement about H3O+.

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 I: Basic Concepts

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

What are the ideal bond angles for H₂O?

What would be the hybridization of the N in the benzene-like molecule (C₅H₅N)?

Choose the INCORRECT statement about H₃O⁺.