Question 1

Select the correct formula for a compound formed from barium and nitrogen.

Accepted Answer

A)   BaN
B)   BaN2
C)   Ba2N3
D)   Ba2N
E)   Ba3N2F) A) and E)
G) A) and D)

Question 2

The more C-O and O-H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

Accepted Answer

A) True 
 B)False

Question 3

Select the correct formula for a compound formed from calcium and chlorine.

Accepted Answer

A)   CaCl
B)   CaCl2
C)   Ca2Cl
D)   Ca2Cl2
E)   CaCl3F) A) and B)
G) C) and E) B

Question 4

Select the compound with the lowest (i.e., least negative)  lattice energy.

Accepted Answer

A)   CsBr(s) 
B)   NaCl(s) 
C)   SrO(s) 
D)   CaO(s) 
E)   KBr(s) F) None of the above
G) A) and B) A

Question 5

Select the element whose Lewis symbol is correct.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and C)
G) A) and E)

Question 6

For which of the following elements (in their normal, stable, forms)  would it be correct to describe the bonding as involving "electron pooling"?

Accepted Answer

A)   hydrogen
B)   helium
C)   sulfur
D)   iodine
E)   aluminumF) A) and E)
G) B) and C)

Question 7

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ)  the standard enthalpy change ΔH° for the reaction written below, using the bond energies given. N2(g)  + 3H2(g)  → 2NH3(g) 
Bond: N≡N H-H N-H
Bond energy(kJ/mol) : 945 432 391

Accepted Answer

A)   -969 kJ
B)   -204 kJ
C)   -105 kJ
D)   204 kJ
E)   595 kJF) None of the above
G) A) and D)

Question 8

The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.

Accepted Answer

A)   increases; increases
B)   increases; decreases
C)   decreases; increases
D)   decreases; decreases
E)   None of these choices are correct.F) A) and E)
G) A) and B)

Question 9

Arrange the following bonds in order of increasing bond strength.

Accepted Answer

A)   C-I 
B)   C-F 
C)   C-Br 
D)   C-I 
E)   None of these choices are correct.F) All of the above
G) C) and E)

Question 10

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) A) and E)
G) C) and D)

Question 11

Which of the following elements is the most electronegative?

Accepted Answer

A)   Ne
B)   Rb
C)   P
D)   I
E)   ClF) A) and E)
G) C) and D)

Question 12

The melting points of metals are only moderately high because

Accepted Answer

A)   metallic bonding is weak.
B)   metals have fewer bonding electrons than nonmetals.
C)   metals also have relatively low boiling points.
D)   the melting process does not break the metallic bonds.
E)   metals prefer to be bonded to nonmetals.F) B) and E)
G) B) and D)

Question 13

In which of these substances are the atoms held together by metallic bonding?

Accepted Answer

A)   CO2
B)   Si
C)   Br2
D)   S8
E)   CrF) A) and E)
G) A) and B)

Question 14

Which of the following period 3 chlorides would be expected to have the highest melting point?

Accepted Answer

A)   MgCl2
B)   AlCl3
C)   SiCl4
D)   PCl3
E)   SCl2F) B) and C)
G) B) and E) A

Question 15

Calculate the lattice energy of magnesium sulfide from the data given below. Mg(s)  → Mg(g)  ΔH° = 148 kJ/mol
Mg(g)  → Mg2+(g)  + 2e- ΔH° = 2186 kJ/mol
S8(s)  → 8S(g)  ΔH° = 2232 kJ/mol
S(g)  + 2e- → S2-(g)  ΔH° = 450 kJ/mol
8Mg(s)  + S8(s)  → 8MgS(s)  ΔH° = -2744 kJ/mol
Mg2+(g)  + S2-(g)  → MgS(s)  ΔH°lattice = ?

Accepted Answer

A)   -3406 kJ/mol
B)   -2720. kJ/mol
C)   2720. kJ/mol
D)   3406 kJ/mol
E)   None of these choices are correct.F) A) and B)
G) A) and D)

Question 16

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 17

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 18

The majority of elements are good electrical conductors when in solid form.

Accepted Answer

A) True 
 B)False

Question 19

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Accepted Answer

A)   -484 kJ
B)   -366 kJ
C)   -61 kJ
D)   +61 kJ
E)   +366 kJF) A) and B)
G) A) and C)

Question 20

Which of the following elements is the least electronegative?

Accepted Answer

A)   Si
B)   Se
C)   S
D)   Sc
E)   SrF) C) and D)
G) B) and E)

Exam 9: Models of Chemical Bonding

Select the correct formula for a compound formed from barium and nitrogen.

Correct Answer
verified

The more C-O and O-H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

Correct Answer
verified

Select the correct formula for a compound formed from calcium and chlorine.

Correct Answer
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B

Select the compound with the lowest (i.e., least negative) lattice energy.

Correct Answer
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A

Select the element whose Lewis symbol is correct.

Correct Answer
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For which of the following elements (in their normal, stable, forms) would it be correct to describe the bonding as involving "electron pooling"?

Correct Answer
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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ΔH° for the reaction written below, using the bond energies given. N₂(g) + 3H₂(g) → 2NH₃(g) Bond: N≡N H-H N-H Bond energy(kJ/mol) : 945 432 391

Correct Answer
verified

The lattice energy for ionic crystals increases as the charge on the ions _ and the size of the ions ______.

Correct Answer
verified

Arrange the following bonds in order of increasing bond strength.

Correct Answer
verified

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

Correct Answer
verified

Which of the following elements is the most electronegative?

Correct Answer
verified

The melting points of metals are only moderately high because

Correct Answer
verified

In which of these substances are the atoms held together by metallic bonding?

Correct Answer
verified

Which of the following period 3 chlorides would be expected to have the highest melting point?

Correct Answer
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A

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

Correct Answer
verified

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

Correct Answer
verified

The majority of elements are good electrical conductors when in solid form.

Correct Answer
verified

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Correct Answer
verified

Which of the following elements is the least electronegative?

Correct Answer
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Exam 9: Models of Chemical Bonding

Select the correct formula for a compound formed from barium and nitrogen.

Correct AnswerverifiedShow Answer

The more C-O and O-H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

Correct AnswerverifiedShow Answer

Select the correct formula for a compound formed from calcium and chlorine.

Correct AnswerverifiedB

Select the compound with the lowest (i.e., least negative) lattice energy.

Correct AnswerverifiedA

Select the element whose Lewis symbol is correct.

Correct AnswerverifiedShow Answer

For which of the following elements (in their normal, stable, forms) would it be correct to describe the bonding as involving "electron pooling"?

Correct AnswerverifiedShow Answer

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ΔH° for the reaction written below, using the bond energies given. N2(g) + 3H2(g) → 2NH3(g) Bond: N≡N H-H N-H Bond energy(kJ/mol) : 945 432 391

Correct AnswerverifiedShow Answer

The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.

Correct AnswerverifiedShow Answer

Arrange the following bonds in order of increasing bond strength.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following elements is the most electronegative?

Correct AnswerverifiedShow Answer

The melting points of metals are only moderately high because

Correct AnswerverifiedShow Answer

In which of these substances are the atoms held together by metallic bonding?

Correct AnswerverifiedShow Answer

Which of the following period 3 chlorides would be expected to have the highest melting point?

Correct AnswerverifiedA

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

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

Correct AnswerverifiedShow Answer

The majority of elements are good electrical conductors when in solid form.

Correct AnswerverifiedShow Answer

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Correct AnswerverifiedShow Answer

Which of the following elements is the least electronegative?

Correct AnswerverifiedShow Answer

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B

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A

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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ΔH° for the reaction written below, using the bond energies given. N₂(g) + 3H₂(g) → 2NH₃(g) Bond: N≡N H-H N-H Bond energy(kJ/mol) : 945 432 391

Correct Answer
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The lattice energy for ionic crystals increases as the charge on the ions _ and the size of the ions ______.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A

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Correct Answer
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Correct Answer
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Correct Answer
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