Question 1

The Lewis structure reveals a triple bond in which of the following molecules?

Accepted Answer

A)  Br2
B)  O2
C)  N2
D)  H2
E)  CH4F) A) and B)
G) A) and C)

Question 2

Calculate the energy required for the gas phase process represented by
Na(g)+ Br(g) $\rarr$Na+(g)+ Br - (g) 
Given:	
Ionization energy (Na) = 496 kJ/mol
Electron affinity (Br)    = 324 kJ/mol
Electron affinity (Na)   = 53 kJ/mol

Accepted Answer

Question 3

Arrange the elements Ba, Br, and Ga in order of increasing electronegativity

Accepted Answer

A)  Ba 
B)  Br 
C)  Ba 
D)  Ga 
E)  Ga < Br < BaF) A) and B)
G) B) and D)

Question 4

Which one of the following is most likely to be a covalent compound?

Accepted Answer

A)  CsOH
B)  NF3
C)  Sr(NO3) 2
D)  CaO
E)  LiFF) B) and C)
G) A) and E)

Question 5

What type of bonding is present in the ion O22- (ionic, covalent, or both)?

Accepted Answer

Question 6

What is the formal charge on sulfur in the most favorable Lewis structure for the SCN- (thiocyanate) ion based on minimizing formal charge overall?

Accepted Answer

A)  -2
B)  -1
C)  0
D)  +1
E)  +2F) A) and B)
G) C) and D)

Question 7

Write the chemical equation for which the enthalpy of reaction is the lattice energy of KCl(s).

Accepted Answer

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Question 8

Write a Lewis structure for OF2.

Accepted Answer

Question 9

In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the central iodine atom is

Accepted Answer

A)  +2
B)  +1
C)  0
D)  -1
E)  -2F) C) and D)
G) B) and E)

Question 10

The total number of valence electrons in the molecule CO2 is

Accepted Answer

A)  4
B)  10
C)  14
D)  16
E)  20F) A) and D)
G) All of the above

Question 11

Write the Lewis structure of boron trifluoride.

Accepted Answer

The answer of Write the Lewis structure of boron trifluoride....

Question 12

The Lewis structure for CS2 is:

Accepted Answer

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F) All of the above

Question 13

Which one of the following is most likely to be an ionic compound?

Accepted Answer

A)  CaCl2
B)  CO2
C)  CS2
D)  SO2
E)  OF2F) B) and D)
G) A) and C)

Question 14

Which response includes all the molecules below that do not follow the octet rule? (1) H2S (2) BCl3 (3) PH3 (4) SF4

Accepted Answer

A)  (2) and (4) 
B)  (2) and (3) 
C)  (1) and (2) 
D)  (3) and (4) 
E)  (1) and (4) F) C) and D)
G) B) and C)

Question 15

Which of the following covalent bonds is the most polar (i.e., highest percent ionic character) ?

Accepted Answer

A)  Al - I
B)  Si - I
C)  Al - Cl
D)  Si - Cl
E)  Si - PF) B) and E)
G) A) and D)

Question 16

List all types of bonding present in the molecule S8  I.ionic bond
II.polar covalent bond
III.nonpolar covalent bond

Accepted Answer

A)  I only
B)  II only
C)  III only
D)  I and II
E)  II and IIIF) B) and D)
G) A) and B)

Question 17

Which one of the following compounds utilizes both ionic and covalent bonding?

Accepted Answer

A)  C10H22O
B)  NH3
C)  Na2S
D)  NH4NO3
E)  K3NF) A) and B)
G) A) and C)

Question 18

Which molecule has a Lewis structure that does not obey the octet rule?

Accepted Answer

A)  N2O
B)  CS2
C)  PH3
D)  CCl4
E)  NO2F) B) and C)
G) All of the above

Question 19

Which one of the following molecules has an atom with an incomplete octet?

Accepted Answer

A)  NF3
B)  H2O
C)  AsCl3
D)  GeH4
E)  BF3F) A) and D)
G) A) and C)

Question 20

Use the Born-Haber cycle to calculate the lattice energy of KCl(s) given the following data:  Δ\DeltaΔ H(sublimation) K = 79.2 kJ/mol
I1 (K) = 418.7 kJ/mol
Bond energy (Cl-Cl) = 242.8 kJ/mol
EA (Cl) = 348 kJ/mol
 Δ\DeltaΔ H f  (KCl(s) ) = -435.7 kJ/mol

Accepted Answer

A)  -165 kJ/mol
B)  288 kJ/mol
C)  629 kJ/mol
D)  707 kJ/mol
E)  828 kJ/mol F) B) and C)
G) A) and E)

Exam 9: Chemical Bonding I: Basic Concepts

Write the chemical equation for which the enthalpy of reaction is the lattice energy of KCl(s).

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Which one of the following is most likely to be a covalent compound?

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Which one of the following is most likely to be an ionic compound?

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The Lewis structure for CS2 is:

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List all types of bonding present in the molecule S8 I.ionic bond II.polar covalent bond III.nonpolar covalent bond

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In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the central iodine atom is

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The Lewis structure reveals a triple bond in which of the following molecules?

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Calculate the energy required for the gas phase process represented by Na(g)+ Br(g) →\rarr→ Na+(g)+ Br - (g) Given: Ionization energy (Na) = 496 kJ/mol Electron affinity (Br) = 324 kJ/mol Electron affinity (Na) = 53 kJ/mol

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Write the Lewis structure of boron trifluoride.

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Use the Born-Haber cycle to calculate the lattice energy of KCl(s) given the following data: Δ\DeltaΔ H(sublimation) K = 79.2 kJ/mol I1 (K) = 418.7 kJ/mol Bond energy (Cl-Cl) = 242.8 kJ/mol EA (Cl) = 348 kJ/mol Δ\DeltaΔ H f (KCl(s) ) = -435.7 kJ/mol

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Arrange the elements Ba, Br, and Ga in order of increasing electronegativity

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Which response includes all the molecules below that do not follow the octet rule? (1) H2S (2) BCl3 (3) PH3 (4) SF4

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Write a Lewis structure for OF2.

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Which one of the following molecules has an atom with an incomplete octet?

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The total number of valence electrons in the molecule CO2 is

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Which of the following covalent bonds is the most polar (i.e., highest percent ionic character) ?

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Which molecule has a Lewis structure that does not obey the octet rule?

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What type of bonding is present in the ion O22- (ionic, covalent, or both)?

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Which one of the following compounds utilizes both ionic and covalent bonding?

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What is the formal charge on sulfur in the most favorable Lewis structure for the SCN- (thiocyanate) ion based on minimizing formal charge overall?

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The Lewis structure for CS₂ is:

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List all types of bonding present in the molecule S₈ I.ionic bond II.polar covalent bond III.nonpolar covalent bond

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In the Lewis structure of the iodate ion, IO₃^-, that satisfies the octet rule, the formal charge on the central iodine atom is

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Calculate the energy required for the gas phase process represented by Na(g)+ Br(g) $\rarr$ Na⁺(g)+ Br^-(g) Given: Ionization energy (Na) = 496 kJ/mol Electron affinity (Br) = 324 kJ/mol Electron affinity (Na) = 53 kJ/mol

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Use the Born-Haber cycle to calculate the lattice energy of KCl(s) given the following data: $\Delta$ H(sublimation) K = 79.2 kJ/mol I₁ (K) = 418.7 kJ/mol Bond energy (Cl-Cl) = 242.8 kJ/mol EA (Cl) = 348 kJ/mol $\Delta$ H^f(KCl(s) ) = -435.7 kJ/mol

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Which response includes all the molecules below that do not follow the octet rule? (1) H₂S (2) BCl₃ (3) PH₃ (4) SF₄

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Write a Lewis structure for OF₂.

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The total number of valence electrons in the molecule CO₂ is

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What type of bonding is present in the ion O₂^2- (ionic, covalent, or both)?

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What is the formal charge on sulfur in the most favorable Lewis structure for the SCN^- (thiocyanate) ion based on minimizing formal charge overall?

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