Question 1

The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

Accepted Answer

A)  3
B)  4
C)  6
D)  8
E)  18F) A) and B)
G) C) and D)

Question 2

Which of the following Lewis structures is incorrect?

Accepted Answer

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

Question 3

How many covalent bonds will be drawn to phosphorous in PO43- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s) .

Accepted Answer

A)  4
B)  5
C)  6
D)  7
E)  8F) B) and C)
G) C) and E)

Question 4

The covalent bond with the greatest polarity would form in which of the atom pairs below?

Accepted Answer

A)  Br - Br
B)  S - O
C)  C - P
D)  C - O
E)  B - OF) A) and D)
G) D) and E)

Question 5

Define electronegativity:

Accepted Answer

A)  an atoms ability to attract electrons that are shared in a chemical bond
B)  an atoms ability to form an ionic bond with another atom
C)  an atoms ability to donate valence electrons to another atom
D)  an atoms ability to form a cation
E)  an atoms ability to form double and triple bondsF) C) and E)
G) A) and B)

Question 6

Write a Lewis structure for SO3 that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO3 that obey the octet rule.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> Total number of res...

Question 7

Arrange the following bonds in order of increasing ionic character H - Cl
C - H
H - H
O - H

Accepted Answer

A)  H - Cl 
B)  H - H 
C)  H - H 
D)  C - H 
E)  C - H < H - Cl < O - H < H - HF) None of the above
G) B) and C)

Question 8

What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for the fulminate ion, CNO-, based on minimizing formal charge overall?

Accepted Answer

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

Question 9

A nonpolar covalent bond (i.e., pure covalent) would form in which one of the following pairs of atoms?

Accepted Answer

A)  Na - Cl
B)  H - Cl
C)  Li - Br
D)  Se - Br
E)  Br - BrF) D) and E)
G) A) and E)

Question 10

What type of bonding is present in the compound Al(ClO3)3 (ionic, covalent, or both)?

Accepted Answer

Question 11

The total number of valence electrons in the compound NH4NO3 is

Accepted Answer

A)  28
B)  30
C)  32
D)  42
E)  80F) B) and D)
G) B) and E)

Question 12

Which of the following solids would have the highest melting point?

Accepted Answer

A)  NaF
B)  NaCl
C)  NaBr
D)  NaIE) None of the above
F) C) and D)

Question 13

Nitrous oxide, N2O, is sometimes called "laughing gas".What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall? (The atom connectivity is N-N-O.)

Accepted Answer

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

Question 14

Which of the elements listed below would most likely form an ionic bond when bonded to chlorine?

Accepted Answer

A)  H
B)  Br
C)  O
D)  Sr
E)  NF) D) and E)
G) B) and E)

Question 15

Write a Lewis structure for the chlorite ion, ClO2-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Accepted Answer

Question 16

The polarity of covalent bonds increases as the percent ionic character increases.

Accepted Answer

A) True 
 B)False

Question 17

What type of bonding is present in the ion ClO2-(ionic, covalent, or both)?

Accepted Answer

Question 18

The Lewis structure reveals an unpaired electron (free radical) in which of the following species?

Accepted Answer

A)  NO3-
B)  N2O
C)  NO2
D)  NO2-
E)  HNO3F) None of the above
G) C) and D)

Question 19

List all types of bonding present in the compound NH4NO3  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 E)
G) None of the above

Question 20

Which one of the following compounds does not follow the octet rule?

Accepted Answer

A)  NF3
B)  CF4
C)  PF5
D)  AsH3
E)  HClF) D) and E)
G) C) and E)

Exam 9: Chemical Bonding I: Basic Concepts

Arrange the following bonds in order of increasing ionic character H - Cl C - H H - H O - H

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What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for the fulminate ion, CNO-, based on minimizing formal charge overall?

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Which of the following solids would have the highest melting point?

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How many covalent bonds will be drawn to phosphorous in PO43- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s) .

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The covalent bond with the greatest polarity would form in which of the atom pairs below?

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The polarity of covalent bonds increases as the percent ionic character increases.

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What type of bonding is present in the compound Al(ClO3)3 (ionic, covalent, or both)?

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Write a Lewis structure for the chlorite ion, ClO2-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

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The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

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Define electronegativity:

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Which one of the following compounds does not follow the octet rule?

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Which of the following Lewis structures is incorrect?

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The total number of valence electrons in the compound NH4NO3 is

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The Lewis structure reveals an unpaired electron (free radical) in which of the following species?

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Write a Lewis structure for SO3 that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO3 that obey the octet rule.

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A nonpolar covalent bond (i.e., pure covalent) would form in which one of the following pairs of atoms?

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Nitrous oxide, N2O, is sometimes called "laughing gas".What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall? (The atom connectivity is N-N-O.)

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Which of the elements listed below would most likely form an ionic bond when bonded to chlorine?

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List all types of bonding present in the compound NH4NO3 I.ionic bond II.polar covalent bond III.nonpolar covalent bond

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What type of bonding is present in the ion ClO2-(ionic, covalent, or both)?

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What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for the fulminate ion, CNO^-, based on minimizing formal charge overall?

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How many covalent bonds will be drawn to phosphorous in PO₄^3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s) .

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What type of bonding is present in the compound Al(ClO₃)₃ (ionic, covalent, or both)?

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Write a Lewis structure for the chlorite ion, ClO₂^-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

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The total number of bonding electrons in a molecule of formaldehyde (H₂CO) is

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The total number of valence electrons in the compound NH₄NO₃ is

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Write a Lewis structure for SO₃ that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO₃ that obey the octet rule.

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Total number of res...
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Nitrous oxide, N₂O, is sometimes called "laughing gas".What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall? (The atom connectivity is N-N-O.)

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List all types of bonding present in the compound NH₄NO₃ I.ionic bond II.polar covalent bond III.nonpolar covalent bond

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What type of bonding is present in the ion ClO₂^-(ionic, covalent, or both)?

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