Question 1

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

Accepted Answer

A) True 
 B)False

Question 2

In covalent bond formation, the potential energy reaches a maximum when the internuclear distance is equal to the bond length.

Accepted Answer

A) True 
 B)False

Question 3

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ)  the standard enthalpy change H° for the reaction written below, using the bond energies given. H° for the reaction written below, using the bond energies given.   A)  -969 kJ B)  -204 kJ C)  -105 kJ D)  204 kJ E)  595 kJ" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -969 kJ
B)   -204 kJ
C)   -105 kJ
D)   204 kJ
E)   595 kJF) A) and B)
G) B) and E)

Question 4

Select the compound with the highest (i.e., most negative)  lattice energy.

Accepted Answer

A)   CaS(s) 
B)   BaO(s) 
C)   NaI(s) 
D)   LiBr(s) 
E)   MgO(s) F) A) and E)
G) C) and D)

Question 5

Select the strongest bond in the following group.

Accepted Answer

A)   C-S
B)   C-O
C)   C=C
D)   CN
E)   C-FF) A) and B)
G) A) and C)

Question 6

Arrange oxygen, sulfur, calcium, rubidium, and potassium in order of decreasing electronegativity.

Accepted Answer

A)   O > S > Ca > K > Rb
B)   O > S > Ca > Rb > K
C)   O > S > Rb > K > Ca
D)   O > S > Rb > Ca > K
E)   None of the above orders is correct.F) B) and C)
G) A) and E)

Question 7

When two atoms form a covalently-bonded diatomic molecule, the distance between the nuclei at which the potential energy is at a minimum is called

Accepted Answer

A)   the bond energy.
B)   the bond length.
C)   the molecular diameter.
D)   the covalent radius.
E)   the covalent diameter.F) B) and D)
G) B) and E)

Question 8

The lattice energy is the energy released when separated ions in the gas phase combine to form ionic molecules in the gas phase.

Accepted Answer

A) True 
 B)False

Question 9

Analysis of an unknown substance showed that it has a moderate melting point and is a good conductor of heat and electricity in the solid phase. Which of the following substances would have those characteristics?

Accepted Answer

A)   NaCl
B)   Si
C)   CCl4
D)   I2
E)   GaF) A) and C)
G) All of the above

Question 10

Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules?

Accepted Answer

A)   low melting point
B)   low boiling point
C)   weak bonds
D)   poor electrical conductor when solid
E)   poor electrical conductor when moltenF) C) and E)
G) A) and D)

Question 11

Which one of the following properties is least characteristic of typical ionic compounds?

Accepted Answer

A)   high melting point
B)   high boiling point
C)   brittleness
D)   poor electrical conductor when solid
E)   poor electrical conductor when moltenF) B) and D)
G) A) and B)

Question 12

Based on electronegativity trends in the periodic table, predict which of the following compounds will have the greatest % ionic character in its bonds.

Accepted Answer

A)   H2O
B)   LiI
C)   CaO
D)   RbF
E)   HClF) A) and E)
G) A) and B)

Question 13

Describe, with appropriate explanations, the key factors which affect the magnitude of the lattice energy of an ionic substance.

Accepted Answer

By Coulomb's law, the energy of two elec...

Question 14

Which of the following elements is the most electronegative?

Accepted Answer

A)   S
B)   Ru
C)   Si
D)   Te
E)   CsF) B) and E)
G) A) and B)

Question 15

In not more than three sentences, describe the key features of bonding in solid aluminum.

Accepted Answer

This is metallic bonding. The aluminum a...

Question 16

In not more than three sentences, describe the electron arrangement responsible for bonding in Cl2 molecules.

Accepted Answer

This is covalent bonding. The chlorine a...

Question 17

Which one of the following properties is least characteristic of typical metals?

Accepted Answer

A)   moderately high melting point
B)   high boiling point
C)   brittleness
D)   good electrical conductor when solid
E)   good electrical conductor when moltenF) None of the above
G) B) and E)

Question 18

Electronegativity is a measure of

Accepted Answer

A)   the energy needed to remove an electron from an atom.
B)   the energy released when an electron is added to an atom.
C)   the magnitude of the negative charge on an electron.
D)   the attraction by an atom for electrons in a chemical bond.
E)   the magnitude of the negative charge on a molecule.F) A) and B)
G) C) and D)

Question 19

Describe in brief how electronegativity values can be used to predict the percent ionic character of a bond between two atoms.

Accepted Answer

Take the electronegativity difference (F...

Question 20

No real bonds are 100% ionic in character.

Accepted Answer

A) True 
 B)False

Exam 9: Models of Chemical Bonding

Which one of the following properties is least characteristic of typical ionic compounds?

Correct AnswerverifiedShow Answer

In not more than three sentences, describe the electron arrangement responsible for bonding in Cl2 molecules.

Correct AnswerverifiedThis is covalent bonding. The chlorine a...View AnswerShow Answer

In not more than three sentences, describe the key features of bonding in solid aluminum.

Correct AnswerverifiedThis is metallic bonding. The aluminum a...View AnswerShow Answer

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change H° for the reaction written below, using the bond energies given.

Correct AnswerverifiedShow Answer

The lattice energy is the energy released when separated ions in the gas phase combine to form ionic molecules in the gas phase.

Correct AnswerverifiedShow Answer

No real bonds are 100% ionic in character.

Correct AnswerverifiedShow Answer

Based on electronegativity trends in the periodic table, predict which of the following compounds will have the greatest % ionic character in its bonds.

Correct AnswerverifiedShow Answer

Arrange oxygen, sulfur, calcium, rubidium, and potassium in order of decreasing electronegativity.

Correct AnswerverifiedShow Answer

Select the compound with the highest (i.e., most negative) lattice energy.

Correct AnswerverifiedShow Answer

Electronegativity is a measure of

Correct AnswerverifiedShow Answer

Which of the following elements is the most electronegative?

Correct AnswerverifiedShow Answer

Analysis of an unknown substance showed that it has a moderate melting point and is a good conductor of heat and electricity in the solid phase. Which of the following substances would have those characteristics?

Correct AnswerverifiedShow Answer

When two atoms form a covalently-bonded diatomic molecule, the distance between the nuclei at which the potential energy is at a minimum is called

Correct AnswerverifiedShow Answer

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

Correct AnswerverifiedShow Answer

Which one of the following properties is least characteristic of typical metals?

Correct AnswerverifiedShow Answer

In covalent bond formation, the potential energy reaches a maximum when the internuclear distance is equal to the bond length.

Correct AnswerverifiedShow Answer

Select the strongest bond in the following group.

Correct AnswerverifiedShow Answer

Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules?

Correct AnswerverifiedShow Answer

Describe in brief how electronegativity values can be used to predict the percent ionic character of a bond between two atoms.

Correct AnswerverifiedTake the electronegativity difference (F...View AnswerShow Answer

Describe, with appropriate explanations, the key factors which affect the magnitude of the lattice energy of an ionic substance.

Correct AnswerverifiedBy Coulomb's law, the energy of two elec...View AnswerShow Answer

Correct Answer
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In not more than three sentences, describe the electron arrangement responsible for bonding in Cl₂ molecules.

Correct Answer
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This is covalent bonding. The chlorine a...
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This is metallic bonding. The aluminum a...
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Correct Answer
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Take the electronegativity difference (F...
View Answer

Correct Answer
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By Coulomb's law, the energy of two elec...
View Answer