Question 1

The bond order for CN^- is 2.

Accepted Answer

The bond order for a molecule or ion is calculated based on the number of bonding and antibonding electrons in its molecular orbitals. The given notation "CN^-" does not correspond to a recognized method for describing molecular structures or bond orders, making it impossible to determine a bond order from it.

Question 2

A(n)__________ molecular orbital is lower in energy than the atomic orbital of which it is composed.

Accepted Answer

The answer of A(n)__________ molecular orbital is lower in energy...

Question 3

Draw a molecular orbital diagram for O₂ and N₂.Using molecular orbital theory,explain why the removal of one electron in O₂ strengthens bonding,while the removal of one electron in N₂ weakens bonding.

Accepted Answer

The answer of Draw a molecular orbital diagram for O₂...

Question 4

The concept of __________ is required for certain molecules because the localized electron model assumes electrons are located between a given pair of atoms in a molecule.

Accepted Answer

The answer of The concept of __________ is required for...

Question 5

The bond order in the NO molecule is
A)1
B) 
C)2
D) 
E)3

Accepted Answer

The answer of The bond order in the NO molecule...

Question 6

The number of molecular orbitals formed is always __________ the number of atomic orbitals combined.

Accepted Answer

The answer of The number of molecular orbitals formed is...

Question 7

The mixing of native atomic orbitals to form special orbitals for bonding is called __________.

Accepted Answer

The answer of The mixing of native atomic orbitals to...

Question 8

Consider the structure of glycine,the simplest amino acid:  
a)Indicate the hybridizations at each N and C atom in the molecule.
b)What is the total number of bonds in the molecule?
c)What is the total number of $\pi$ bonds in the molecule?

Accepted Answer

The answer of Consider the structure of glycine,the simplest amino...

Question 9

Sulfur trioxide is known to be planar with all the oxygen atoms equidistant from the central sulfur atom.On the basis of these facts,which of the following conclusions may be drawn concerning this molecule? I.It can be represented by three equivalent resonance structures. II.The dipoles associated with each S-O bond are equal in magnitude. III.The sulfur atom is sp² hybridized. A)I only B)II only C)III only D)I and II only E)I,II,and III

Accepted Answer

Sulfur trioxide (SO₃) is a planar molecule with resonance structures, equal S-O bond dipoles, and sp² hybridization of the sulfur atom.

Question 10

The C-C-H bond angles in ethylene,C₂H₄,are 120°.What is the hybridization of the carbon orbitals?

Accepted Answer

The answer of The C-C-H bond angles in ethylene,C₂H₄,are 120°.What...

Question 11

Which of these statements about benzene is true? A)All carbon atoms in benzene are sp³ hybridized. B)Benzene contains only $\pi$ bonds between C atoms. C)The bond order of each C-C bond in benzene is 1.5. D)Benzene is an example of a molecule that displays ionic bonding. E)All of these statements are false.

Accepted Answer

The structure of benzene includes a ring of six carbons with alternating single and double bonds. These alternating bonds are equivalent and have bond order of 1.5. Option A is false as the carbon atoms in benzene are sp2 hybridized. Option B is false as there are three sigma bonds and three pi bonds between the carbon atoms in benzene. Option D is false as benzene is a covalent molecule, not an ionic one.

Question 12

Which of the following statements about the CO₃²^- ion is false? A)The orbitals on the carbon atom are sp² hybridized. B)The ion is expected to be diamagnetic. C)The C-O bonds are different lengths. D)The ion has a total of 24 electrons. E)All the above statements are true.

Accepted Answer

In the carbonate ion (CO₃²⁻), all C-O bonds are of equal length due to resonance, making statement C false.

Question 13

__________ causes a substance to be attracted into the inducing magnetic field.

Accepted Answer

The answer of __________ causes a substance to be attracted...

Question 14

How many electrons are involved in pi bonding in benzene,C₆H₆? A)12 B)30 C)3 D)6 E)18

Accepted Answer

Benzene has 6 pi bonds, each involving 2 electrons, for a total of 12 electrons involved in pi bonding.

Question 15

Consider three molecules - A,B,C.Molecule A has a hybridization of sp³.Molecule B has two more effective pairs (electron pairs around the central atom)than molecule A.Molecule C consists of one $\sigma$ bond and two $\pi$ bonds.Give the molecular structure,hybridization,bond angles,and an example for each molecule.

Accepted Answer

The answer of Consider three molecules - A,B,C.Molecule A has...

Question 16

__________ is the difference between the number of bonding electrons and the number of antibonding electrons divided by two.

Accepted Answer

The answer of __________ is the difference between the number...

Question 17

Which of the following are paramagnetic? O₂O₂^-O₂²^-B₂C₂N₂F₂CN^-P₂

Accepted Answer

The answer of Which of the following are paramagnetic? O₂O₂^-^...

Question 18

The following statements concern molecules that require resonance.Which is true?
A)The pi bonding is most clearly delocalized.
B)The sigma bonding is most clearly delocalized.
C)Both the sigma and pi bonding are delocalized.
D)The benzene molecule is best described by the MO theory.
E)The benzene molecule is best described by the localized electron model.

Accepted Answer

In molecules requiring resonance, such as benzene, the pi bonding is delocalized across the structure, allowing for resonance stabilization.

Question 19

The CO molecule has the bond order:
A)0
B)1
C)2
D)3
E)4

Accepted Answer

The bond order of CO (carbon monoxide) is 3. This is determined by considering the molecular orbital configuration of CO, which results in a triple bond between the carbon and oxygen atoms, comprising one sigma bond and two pi bonds.

Question 20

Consider the benzene molecule.Which of the following statements about the molecule is false? A)All six C-C bonds are known to be equivalent. B)Each carbon atom is sp² hybridized. C)The localized electron model must invoke resonance to account for the six equal C-C bonds. D)It has delocalized pi bonding in the molecule. E)The pi bonds of carbon involve sp² orbitals.

Accepted Answer

The pi bonds in benzene involve p orbitals, not sp² orbitals.

Quiz 9: Covalent Bonding: Orbitals

The bond order for CN- is 2.

A(n)__________ molecular orbital is lower in energy than the atomic orbital of which it is composed.

Draw a molecular orbital diagram for O2 and N2.Using molecular orbital theory,explain why the removal of one electron in O2 strengthens bonding,while the removal of one electron in N2 weakens bonding.

The concept of __________ is required for certain molecules because the localized electron model assumes electrons are located between a given pair of atoms in a molecule.

The bond order in the NO molecule is

The number of molecular orbitals formed is always __________ the number of atomic orbitals combined.

The mixing of native atomic orbitals to form special orbitals for bonding is called __________.

Consider the structure of glycine,the simplest amino acid: a)Indicate the hybridizations at each N and C atom in the molecule. b)What is the total number of bonds in the molecule? c)What is the total number of π\piπ bonds in the molecule?

The C-C-H bond angles in ethylene,C2H4,are 120°.What is the hybridization of the carbon orbitals?

Which of these statements about benzene is true?

Which of the following statements about the CO32- ion is false?

__________ causes a substance to be attracted into the inducing magnetic field.

How many electrons are involved in pi bonding in benzene,C6H6?

__________ is the difference between the number of bonding electrons and the number of antibonding electrons divided by two.

Which of the following are paramagnetic? O2 O2- O22- B2 C2 N2 F2 CN- P2

The following statements concern molecules that require resonance.Which is true?

The CO molecule has the bond order:

Consider the benzene molecule.Which of the following statements about the molecule is false?

The bond order for CN^- is 2.

Draw a molecular orbital diagram for O₂ and N₂.Using molecular orbital theory,explain why the removal of one electron in O₂ strengthens bonding,while the removal of one electron in N₂ weakens bonding.

The C-C-H bond angles in ethylene,C₂H₄,are 120°.What is the hybridization of the carbon orbitals?

Which of the following statements about the CO₃²^- ion is false?

How many electrons are involved in pi bonding in benzene,C₆H₆?

Which of the following are paramagnetic? O₂O₂^-O₂²^-B₂C₂N₂F₂CN^-P₂