Self Quiz 2

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Chapter 7: Covalent Bonds and Molecular Structure

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Self Quiz 2

This activity contains 20 questions.

The forces that operate to keep 2 atoms together in a covalent bond are

between the nuclei of the 2 atoms.between the electrons of one atom and the nucleus of the other atom.between the electrons and nuclei of the same atom.between the neutrons and electrons of the 2 atoms.between the electrons of the 2 atoms.

Which is a reasonable estimate of the bond length between silicon (atomic radius = 117 pm) and carbon (atomic radius = 77 pm)? (Note that the atomic radius in picometers of each atom is given.)

48 pm40 pm388 pm194 pm97 pm

Which statement about bond dissociation energy is not true?

Forming a bond releases an amount of energy equivalent to the negative value of the bond dissociation energy.Bond dissociation energies are reported as exact values for diatomic molecules.The energy disrupts the attractive forces felt between 2 atoms.Forming a bond releases an amount of energy equivalent to the positive value of the bond dissociation energy.Breaking a bond requires an amount of energy equivalent to the positive value of the bond dissociation energy.

A covalent compound has a lower melting point than an ionic compound because

the repulsive nucleus-nucleus forces in molecules tend to push them away from other molecules.molecules are smaller than ions.the attractive forces between the molecules are weak.the covalent bonds in a molecule are weak.the covalent compound is a neutral substance.

In the polar covalent bond C-Cl the electrons of the bond are

separated from one another, with 1 electron attracted to the C atom and the other electron attracted strongly to the Cl atom.equally shared between the 2 atoms.completely transferred to the Cl atom to complete its valence-shell octet.attracted to the carbon atom.attracted to the chlorine atom.

Arrange the bonds Si-S, F-Fe, and N-Cl in order of increasing covalent character.

N-Cl, Si-S, F-FeSi-S, N-Cl, F-FeF-Fe, N-Cl, Si-SF-Fe, Si-S, N-ClSi-S, F-Fe, N-Cl

As you go from left to right across the periodic table, the number of bonds an element forms tends to , while the number of unshared electron pairs tends to _______.

increase, increasedecrease, increaseremain the same, increaseincrease, decreasedecrease, decrease

The electron-dot structure for the molecule HONO contains

3 single bonds and 12 remaining electrons.3 single bonds and 14 remaining electrons.1 single bond, 2 double bonds, and 6 remaining electrons.1 triple bond, 2 single bonds, and 6 remaining electrons.1 double bond, 2 single bonds, and 10 remaining electrons.

Which statement is not true concerning the electron-dot structure of XeO₄?

The central atom is xenon.There are a total of 32 valence electrons.Because Xe is a Group 18 element, it has an extra 2 electrons in an expanded octet.There are 4 single bonds around Xe.Each O atom ends up with 6 electrons in addition to the 2 electrons in the single bond.

Which compound does not have resonance structures?

HONO₂H₂COHONONO₂^-NCO^-

The resonance structure that gives a more accurate representation of the anion SCN^- is the one in which the

formal charge of S is -1, the formal charge of C is 0, and the formal charge of N is 0.sum of the formal charges is zero.formal charge of S is 0, the formal charge of C is 0, and the formal charge of N is -1.formal charge of S is -1, the formal charge of C is +2, and the formal charge of N is -2.formal charge of S is +1, the formal charge of C is 0, and the formal charge of N is -2.

Two electron-dot structures with the formula CS₂ can be drawn. In one the arrangement of the atoms is C-S-S and in the other the arrangement is S-C-S. The most likely arrangement

is the first, since 3 resonance structures, 1 with 2 double bonds and 2 with a single bond and a triple bond, can be drawn.is the first, since all the resonance structures for this arrangement have 2 atoms with formal charges not equal to 0.is a combination of the resonance structures of both arrangements.is the second, since the formal charge of each atom in one of the resonance structures is 0.could be either arrangement, since the formal charges in any of the structures is equal to 0.

The species that has the specified angle correctly matched with its numerical value is

O-C-O angle in CO₃^2-; 120 degrees.I-I-I angle in I₃^-; 120 degrees.F-S-F angle in SF₄; 109 degrees.Cl-P-Cl angle in PCl₃; 120 degrees.F-Xe-F angle in XeF₄; 109 degrees.

For the molecule CH₃CN

the overall molecular geometry of the molecule is square planar.the arrangement of the atoms around the C of the CH₃ is tetrahedral, while the CN arrangement is linear.the overall molecular geometry is planar.the arrangement of the atoms around the C of the CH₃ is square planar, while the CN arrangement is linear.the arrangement of the atoms around the C of the CH₃ is seesaw, while the CN arrangement is linear.

The central atom has sp³ hybridization in the molecule

ClF₃.BH₃.H₂S.BeH₂.XeF₄.

The molecules or ions that have the same hybridization are

CF₄ and SF₄.BF₃ and NO₃^-.PF₅ and SbF₅^2-.CO₂ and SO₂.BeH₂ and NH₂^-.

The molecules that have the same number of sigma and pi bonds as the ClO₃^- anion are

NO₃^-.CO₃^2-.SO₄^2-.IF₃.CO₂.

The bond order of a molecule containing 16 electrons in bonding molecular orbitals and 10 electrons in antibonding molecular orbitals

is 12.is 6.is 4.is 3.is 13.

If the molecular orbital diagram of N₂ (Fig. 7.18, above) is used for the valence electrons of CN^-, then

the calculated bond order is 4.there are no valence electrons in an antibonding orbital.the number of valence electrons in bonding orbitals is 6.the anion is predicted to be paramagnetic.the bond order calculated from the molecular orbital theory agrees with the number of bonds shown in the Lewis structure.

The valence bond theory would incorrectly predict for the NO₃^- anion

the bond lengths in the anion.a trigonal planar geometry.the position of the electron density of the sigma bonds in the anion.a bond angle of 120 degrees.a formal charge of +1 on the N.

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Self Quiz 2

The forces that operate to keep 2 atoms together in a covalent bond are

Which is a reasonable estimate of the bond length between silicon (atomic radius = 117 pm) and carbon (atomic radius = 77 pm)? (Note that the atomic radius in picometers of each atom is given.)

Which statement about bond dissociation energy is not true?

A covalent compound has a lower melting point than an ionic compound because

In the polar covalent bond C-Cl the electrons of the bond are

Arrange the bonds Si-S, F-Fe, and N-Cl in order of increasing covalent character.

As you go from left to right across the periodic table, the number of bonds an element forms tends to __________, while the number of unshared electron pairs tends to _________________.

The electron-dot structure for the molecule HONO contains

Which statement is not true concerning the electron-dot structure of XeO4?

Which compound does not have resonance structures?

The resonance structure that gives a more accurate representation of the anion SCN- is the one in which the

Two electron-dot structures with the formula CS2 can be drawn. In one the arrangement of the atoms is C-S-S and in the other the arrangement is S-C-S. The most likely arrangement

The species that has the specified angle correctly matched with its numerical value is

For the molecule CH3CN

The central atom has sp3 hybridization in the molecule

The molecules or ions that have the same hybridization are

The molecules that have the same number of sigma and pi bonds as the ClO3- anion are

The bond order of a molecule containing 16 electrons in bonding molecular orbitals and 10 electrons in antibonding molecular orbitals

If the molecular orbital diagram of N2 (Fig. 7.18, above) is used for the valence electrons of CN-, then

The valence bond theory would incorrectly predict for the NO3- anion

As you go from left to right across the periodic table, the number of bonds an element forms tends to , while the number of unshared electron pairs tends to _______.

Which statement is not true concerning the electron-dot structure of XeO₄?

The resonance structure that gives a more accurate representation of the anion SCN^- is the one in which the

Two electron-dot structures with the formula CS₂ can be drawn. In one the arrangement of the atoms is C-S-S and in the other the arrangement is S-C-S. The most likely arrangement

For the molecule CH₃CN

The central atom has sp³ hybridization in the molecule

The molecules that have the same number of sigma and pi bonds as the ClO₃^- anion are

If the molecular orbital diagram of N₂ (Fig. 7.18, above) is used for the valence electrons of CN^-, then

The valence bond theory would incorrectly predict for the NO₃^- anion