Question 1

Choose the best Lewis structure for OCl2.

Accepted Answer

A)   2. 
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E)   2. 
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Question 2

Match the following.
-Ca-O

Accepted Answer

A)  strongest covalent bond
B)  longest covalent bond
C)  weakest ionic bond
D)  metallic bond
E)  highest melting point

Question 3

Using periodic trends, place the following bonds in order of increasing ionic character. S-F Se-F O-F

Accepted Answer

A)   Se-F 
B)   S-F 
C)   O-F 
D)   Se-F 
E)   O-F < S-F < Se-F

Question 4

Choose the best Lewis structure for SeO42⁻.

Accepted Answer

A)   42⁻. 
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B)   42⁻. 
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C)   42⁻. 
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D)   42⁻. 
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E)   42⁻. 
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Question 5

Which molecule or compound below contains a polar covalent bond?

Accepted Answer

A)   C2H4
B)   ZnS
C)   LiI
D)   NCl3
E)   AgCl

Question 6

Choose the bond below that is most polar.

Accepted Answer

A)   H-I
B)   H-Br
C)   H-F
D)   H-Cl
E)   C-H

Question 7

Identify the substance that conducts electricity.

Accepted Answer

A)   NaCl dissolved in water
B)   solid NaCl
C)   water
D)   solid sugar
E)   sugar dissolved in water

Question 8

Choose the best Lewis structure for NH4⁺.

Accepted Answer

A)   4⁺. 
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B)   4⁺. 
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D)   4⁺. 
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E)   4⁺. 
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Question 9

The Lewis structure of BrO3- is as follows:  What is the formal charge on Br atom?

Accepted Answer

Question 10

Identify the compound with covalent bonding.

Accepted Answer

A)   Li2S
B)   SrO
C)   CaI2
D)   C2Cl4
E)   SrBr2

Question 11

Which of the following statements is TRUE?

Accepted Answer

A)   An ionic bond is much stronger than most covalent bonds.
B)   An ionic bond is formed through the sharing of electrons.
C)   Ionic compounds at room temperature typically conduct electricity.
D)   Once dissolved in water, ionic compounds rarely conduct electricity.
E)   None of the above is true.

Question 12

Which of the following represent the Lewis structure for Cl?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 13

Choose the best Lewis structure for PO43⁻.

Accepted Answer

A)   43⁻. 
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D)   43⁻. 
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E)   43⁻. 
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Question 14

Use the bond energies provided to estimate ΔrH° for the reaction below. PCl3(g)  + Cl2(g)  → PCl5(l)  ΔrH° = ?
Bond Bond Energy (kJ mol-1) 
Cl-Cl 243
P-Cl 331

Accepted Answer

A)   -243 kJ mol-1
B)   -419 kJ mol-1
C)   -662 kJ mol-1
D)   -67 kJ mol-1
E)   -905 kJ mol-1

Question 15

Match the following.
-Sr-Sr

Accepted Answer

A)  strongest covalent bond
B)  longest covalent bond
C)  weakest ionic bond
D)  metallic bond
E)  highest melting point

Question 16

Draw the resonance structure that has the lowest formal charge on each atom for SO3-2. What is the formal charge on sulfur?

Accepted Answer

A)   -1
B)   +1
C)   0
D)   +2
E)   +3

Question 17

Choose the bond below that is the weakest.

Accepted Answer

A)   Na-Cl
B)   I-I
C)   C=N
D)   Li-F
E)   C=O

Question 18

The Lewis structure of acetate ion is as follows: 
 
What is the formal charge on oxygen atom that contains three lone pairs of electrons?

Accepted Answer

The answer of The Lewis structure of acetate ion is...

Question 19

Choose the best Lewis structure for SF4.

Accepted Answer

A)   4. 
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Question 20

Identify the compound with the highest magnitude of lattice energy.

Accepted Answer

A)   MgO
B)   BaO
C)   SrO
D)   CaO

Exam 9: Chemical Bonding I: Lewis Theory

Draw the resonance structure that has the lowest formal charge on each atom for SO3-2. What is the formal charge on sulfur?

Correct AnswerverifiedShow Answer

Identify the compound with covalent bonding.

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Choose the best Lewis structure for PO43⁻.

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Identify the compound with the highest magnitude of lattice energy.

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Choose the best Lewis structure for SeO42⁻.

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Choose the best Lewis structure for SF4.

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The Lewis structure of BrO3- is as follows: What is the formal charge on Br atom?

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Choose the bond below that is the weakest.

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Which molecule or compound below contains a polar covalent bond?

Correct AnswerverifiedShow Answer

Match the following. -Ca-O

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Which of the following statements is TRUE?

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Choose the bond below that is most polar.

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Which of the following represent the Lewis structure for Cl?

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Choose the best Lewis structure for NH4⁺.

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Match the following. -Sr-Sr

Correct AnswerverifiedShow Answer

Choose the best Lewis structure for OCl2.

Correct AnswerverifiedShow Answer

The Lewis structure of acetate ion is as follows: What is the formal charge on oxygen atom that contains three lone pairs of electrons?

Correct AnswerverifiedShow Answer

Using periodic trends, place the following bonds in order of increasing ionic character. S-F Se-F O-F

Correct AnswerverifiedShow Answer

Identify the substance that conducts electricity.

Correct AnswerverifiedShow Answer

Use the bond energies provided to estimate ΔrH° for the reaction below. PCl3(g) + Cl2(g) → PCl5(l) ΔrH° = ? Bond Bond Energy (kJ mol-1) Cl-Cl 243 P-Cl 331

Correct AnswerverifiedShow Answer

Draw the resonance structure that has the lowest formal charge on each atom for SO₃^-2. What is the formal charge on sulfur?

Correct Answer
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Correct Answer
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Choose the best Lewis structure for PO₄³⁻.

Correct Answer
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Correct Answer
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Choose the best Lewis structure for SeO₄²⁻.

Correct Answer
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Choose the best Lewis structure for SF₄.

Correct Answer
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The Lewis structure of BrO₃^- is as follows: What is the formal charge on Br atom?

Correct Answer
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Choose the best Lewis structure for NH₄⁺.

Correct Answer
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Choose the best Lewis structure for OCl₂.

Correct Answer
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Correct Answer
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Correct Answer
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Use the bond energies provided to estimate Δ_rH° for the reaction below. PCl₃(g) + Cl₂(g) → PCl₅(l) Δ_rH°= ? Bond Bond Energy (kJ mol^-1) Cl-Cl 243 P-Cl 331

Correct Answer
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