Question 1

Draw the Lewis structure for SO42⁻.How many equivalent resonance structures can be drawn?

Accepted Answer

A)  6
B)  2
C)  4
D)  3
E)  8

Question 2

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 are true.

Question 3

How many lone pairs of electrons are on the As atom in AsCl3?

Accepted Answer

A)  0
B)  1
C)  2
D)  3

Question 4

How many of the following elements can form compounds with an expanded octet?
I O Cl Xe

Accepted Answer

A)  2
B)  0
C)  3
D)  1
E)  4

Question 5

Draw the best Lewis structure for CH3-.What is the formal charge on the C?

Accepted Answer

A)  0
B)  1
C)  -1
D)  2

Question 6

How many of the following elements can form compounds with an expanded octet?
Pb Kr Si B

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4

Question 7

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 8

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

Accepted Answer

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

Question 9

Use Lewis theory to determine the chemical formula for the compound formed between Al and O.

Accepted Answer

A)  Al3O2
B)  Al2O3
C)  AlO2
D)  Al2O
E)  AlO

Question 10

Match the following.
-Cs-I

Accepted Answer

A)  weakest ionic bond
B)  strongest covalent bond
C)  metallic bond
D)  highest melting point
E)  longest covalent bondF) Na-BrG) C-F

Question 11

In the Lewis structure of CH3OH,how many bonding pairs of electrons are there?

Accepted Answer

A)  2
B)  7
C)  5
D)  3

Question 12

The compound ClF contains

Accepted Answer

A)  ionic bonds.
B)  nonpolar covalent bonds.
C)  polar covalent bonds with partial negative charges on the F atoms.
D)  polar covalent bonds with partial negative charges on the Cl atoms.

Question 13

Place the following in order of increasing bond length.
NO2⁻ NO3⁻ NO

Accepted Answer

A)  NO 2⁻ 3⁻
B)  NO2⁻ 3⁻ 
C)  NO3⁻ 2⁻
D)  NO 3⁻ 2⁻
E)  NO3⁻ 2⁻ < NO

Question 14

Which of the following ionic compounds would be expected to have the highest lattice energy?

Accepted Answer

A)  Li Cl
B)  Na Cl
C)  K Cl
D)  Rb Cl

Question 15

Choose the bond below that is the weakest.

Accepted Answer

A)  C≡O
B)  N≡N
C)  C-I
D)  C=S
E)  K-Cl

Question 16

Using periodic trends,place the following bonds in order of increasing ionic character.
Si-P Si-Cl Si-S

Accepted Answer

A)  Si-P 
B)  Si-P 
C)  Si-S 
D)  Si-Cl 
E)  Si-Cl < Si-S < Si-P

Question 17

Place the following elements in order of increasing electronegativity.
K Cs P

Accepted Answer

A)  P 
B)  K 
C)  Cs 
D)  Cs 
E)  P < Cs < K

Question 18

Use Lewis theory to determine the chemical formula for the compound formed between K and I.

Accepted Answer

A)  KI2
B)  K2I
C)  KI
D)  K2I2

Question 19

Choose the best Lewis structure for SF4.

Accepted Answer

A)   4. 
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Question 20

Choose the best Lewis structure for SeO42⁻.

Accepted Answer

A)   42⁻. 
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D)   42⁻. 
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Exam 9: Chemical Bonding I: Lewis Theory

Choose the best Lewis structure for SeO42⁻.

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Use Lewis theory to determine the chemical formula for the compound formed between K and I.

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Match the following. -Cs-I

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Which of the following statements is true?

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How many of the following elements can form compounds with an expanded octet? Pb Kr Si B

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How many lone pairs of electrons are on the As atom in AsCl3?

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Use Lewis theory to determine the chemical formula for the compound formed between Al and O.

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Choose the best Lewis structure for SF4.

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Place the following elements in order of increasing electronegativity. K Cs P

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How many of the following elements can form compounds with an expanded octet? I O Cl Xe

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In the Lewis structure of CH3OH,how many bonding pairs of electrons are there?

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Draw the best Lewis structure for CH3-.What is the formal charge on the C?

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Using periodic trends,place the following bonds in order of increasing ionic character. Si-P Si-Cl Si-S

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The compound ClF contains

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Which of the following ionic compounds would be expected to have the highest lattice energy?

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

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Choose the bond below that is the weakest.

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Draw the Lewis structure for SO42⁻.How many equivalent resonance structures can be drawn?

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Place the following in order of increasing bond length. NO2⁻ NO3⁻ NO

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

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Choose the best Lewis structure for SeO₄²⁻.

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How many lone pairs of electrons are on the As atom in AsCl₃?

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Choose the best Lewis structure for SF₄.

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In the Lewis structure of CH₃OH,how many bonding pairs of electrons are there?

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Draw the best Lewis structure for CH₃^-.What is the formal charge on the C?

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The compound ClFcontains

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Draw the Lewis structure for SO₄²⁻.How many equivalent resonance structures can be drawn?

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Place the following in order of increasing bond length. NO₂⁻ NO₃⁻ NO

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

Correct Answer
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