Question 1

The lattice energy of MgCl2 is the energy change for which one of the following processes?

Accepted Answer

A)   Mg(s)  + Cl2(g)  → MgCl2(s) 
B)   Mg(g)  + 2Cl(g)  → MgCl2(s) 
C)   Mg2+(s)  + 2Cl-(g)  → MgCl2(g) 
D)   Mg2+(g)  + 2Cl-(g)  → MgCl2(s) 
E)   MgCl2(aq)  → MgCl2(s)

Question 2

Which of the following is a covalent compound?

Accepted Answer

A)   Na2O
B)   CaCl2
C)   Cl2O
D)   CsCl
E)   Al2O3

Question 3

Select the most polar bond amongst the following.

Accepted Answer

A)   C-O
B)   Si-F
C)   Cl-F
D)   C-F
E)   C-I

Question 4

Analysis of an unknown substance showed that it has a high boiling point and is brittle. It is an insulator as a solid but conducts electricity when melted. Which of the following substances would have those characteristics?

Accepted Answer

A)   HCl
B)   Al
C)   KBr
D)   SiF4
E)   I2

Question 5

Select the compound with the highest lattice energy.

Accepted Answer

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

Question 6

Which of the following contains ionic bonding?

Accepted Answer

A)   CO
B)   SrF2
C)   Al
D)   OCl2
E)   HCl

Question 7

Covalently bonded substances do not necessarily exist as separate molecules.

Accepted Answer

A) True 
 B)False

Question 8

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.

Question 9

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 molten

Question 10

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)   HCl

Question 11

Electronegativities on Pauling's scale are calculated from ionization energies and electron affinities.

Accepted Answer

A) True 
 B)False

Question 12

In which of the following processes does the enthalpy change (ΔH)  directly represent the magnitude of the lattice energy of KCl(s) ?

Accepted Answer

A)   Cl2(g)  + 2K(s)  → 2KC (s) 
B)   KCl(s)  → K+(aq)  + Cl- (aq) 
C)   KCl(s)  → K+(g)  + Cl-(g) 
D)   KCl(s)  → K(s)  + Cl-(g) 
E)   KCl(s)  → K(s)  + Cl(g)

Question 13

Quartz (SiO2)  is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

Accepted Answer

A)   lattice energy.
B)   network attractions.
C)   ionic bonding.
D)   covalent bonding.
E)   metallic bonding.

Question 14

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)   Ga

Question 15

The electrostatic energy of two charged particles is inversely proportional to the distance between them.

Accepted Answer

A) True 
 B)False

Question 16

No real bonds are 100% ionic in character.

Accepted Answer

A) True 
 B)False

Question 17

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 these choices are correct.

Question 18

Arrange aluminum, boron, nitrogen, and phosphorous in order of increasing electronegativity.

Accepted Answer

A)   Al<B<P<N
B)   B<Al<N<P
C)   Al<N<P<B
D)   N<P<B<Al
E)   None of these choices are correct.

Question 19

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following is an ionic compound?

Accepted Answer

A)   H2S
B)   NH3
C)   I2
D)   KI
E)   CCl4

Exam 9: Models of Chemical Bonding

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

No real bonds are 100% ionic in character.

Correct AnswerverifiedShow Answer

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Correct AnswerverifiedShow Answer

In which of the following processes does the enthalpy change (ΔH) directly represent the magnitude of the lattice energy of KCl(s) ?

Correct AnswerverifiedShow Answer

Select the compound with the highest lattice energy.

Correct AnswerverifiedShow Answer

Arrange aluminum, boron, nitrogen, and phosphorous in order of increasing electronegativity.

Correct AnswerverifiedShow Answer

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

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

Which of the following is an ionic compound?

Correct AnswerverifiedShow Answer

Covalently bonded substances do not necessarily exist as separate molecules.

Correct AnswerverifiedShow Answer

Which of the following contains ionic bonding?

Correct AnswerverifiedShow Answer

The electrostatic energy of two charged particles is inversely proportional to the distance between them.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Electronegativities on Pauling's scale are calculated from ionization energies and electron affinities.

Correct AnswerverifiedShow Answer

Select the most polar bond amongst the following.

Correct AnswerverifiedShow Answer

The lattice energy of MgCl2 is the energy change for which one of the following processes?

Correct AnswerverifiedShow Answer

Which of the following is a covalent compound?

Correct AnswerverifiedShow Answer

Analysis of an unknown substance showed that it has a high boiling point and is brittle. It is an insulator as a solid but conducts electricity when melted. Which of the following substances would have those characteristics?

Correct AnswerverifiedShow Answer

Quartz (SiO2) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

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

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The lattice energy of MgCl² is the energy change for which one of the following processes?

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Quartz (SiO₂) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

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