Question 1

The Lewis dot symbol for the calcium ion is

Accepted Answer

A)   2+ 
E)   Ca" class="answers-bank-image d-inline" rel="preload" >
B)   2+ 
E)   Ca" class="answers-bank-image d-inline" rel="preload" >
C)   2+ 
E)   Ca" class="answers-bank-image d-inline" rel="preload" >
D)   Ca2+
E)   CaF) B) and D)
G) A) and C)

Question 2

How many dots does the Lewis dot symbol for sodium have around it?

Accepted Answer

A)   1
B)   2
C)   0
D)   3
E)   11F) B) and E)
G) A) and C)

Question 3

Which of these elements is most likely to exhibit an expanded octet in its compounds?

Accepted Answer

A)   O
B)   S
C)   Na
D)   C
E)   NF) None of the above
G) B) and D)

Question 4

What is the formal charge on the fluorine in ClF2+?

Accepted Answer

A)   -1
B)   +1
C)   0
D)   -2
E)   -3F) C) and D)
G) None of the above

Question 5

Atoms of elements with low ionization energies tend to form ________ while those with positive electron affinities tend to form ________.

Accepted Answer

The answer of Atoms of elements with low ionization energies...

Question 6

How many dots does the Lewis dot symbol for carbon have around it?

Accepted Answer

A)   4
B)   2
C)   6
D)   3
E)   7F) A) and B)
G) D) and E)

Question 7

Which of the following contains covalent bonds?

Accepted Answer

A)   BaO
B)   IBr
C)   Mg
D)   LiBr
E)   CuF) All of the above
G) A) and B)

Question 8

The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.

Accepted Answer

A)   increases, increases
B)   increases, decreases
C)   decreases, increases
D)   decreases, decreases
E)   None of these is generally correct.F) A) and E)
G) None of the above

Question 9

Lewis theorized the octet rule to describe chemical bonding where atoms lose, gain, or share electrons in order to achieve a noble gas configuration.

Accepted Answer

A) True 
 B)False

Question 10

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

Accepted Answer

A)   2F2 which correctly minimizes formal charges. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   2F2 which correctly minimizes formal charges. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   2F2 which correctly minimizes formal charges. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   2F2 which correctly minimizes formal charges. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   2F2 which correctly minimizes formal charges. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and B)
G) None of the above

Question 11

Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is

Accepted Answer

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

Question 12

In which one of the following structures does the central atom have a formal charge of +2?

Accepted Answer

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

Question 13

The number of resonance structures for the nitrate ion that satisfy the octet rule is

Accepted Answer

A)   1.
B)   2.
C)   3.
D)   4.
E)   none of theseF) A) and B)
G) D) and E)

Question 14

Which pair of Lewis structures is not a pair of resonance structures?

Accepted Answer

A)   
B)   
C)   
D)   All of these pairs are resonance structures of the same species.
E)   None of these pairs is resonance structures of the same species.F) B) and D)
G) B) and E)

Question 15

The Lewis dot symbol for the chloride ion is

Accepted Answer

A)   -" class="answers-bank-image d-inline" rel="preload" >
B)   -" class="answers-bank-image d-inline" rel="preload" >
C)   -" class="answers-bank-image d-inline" rel="preload" >
D)   -" class="answers-bank-image d-inline" rel="preload" >
E)   Cl-F) A) and B)
G) All of the above

Question 16

Unshared electrons are always shown in pairs around an atom.

Accepted Answer

A) True 
 B)False

Question 17

A single bond between two atoms represents ________ pair(s) of electrons.

Accepted Answer

The answer of A single bond between two atoms represents...

Question 18

In which one of the following is the best Lewis structure a resonance structure?

Accepted Answer

A)   SO3
B)   BF3
C)   I3-
D)   SCO (C = central atom) 
E)   SO32-F) A) and C)
G) A) and B)

Question 19

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Accepted Answer

A)   2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. 
A)     
B)     
C)     
D)     
E)   None of the choices is correct." class="answers-bank-image d-inline" rel="preload" >
B)   2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. 
A)     
B)     
C)     
D)     
E)   None of the choices is correct." class="answers-bank-image d-inline" rel="preload" >
C)   2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. 
A)     
B)     
C)     
D)     
E)   None of the choices is correct." class="answers-bank-image d-inline" rel="preload" >
D)   2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. 
A)     
B)     
C)     
D)     
E)   None of the choices is correct." class="answers-bank-image d-inline" rel="preload" >
E)   None of the choices is correct.F) B) and D)
G) B) and C)

Question 20

Ionic compounds may carry a net positive or net negative charge.

Accepted Answer

A) True 
 B)False

Exam 8: Chemical Bonding I: Basic Concepts

Which pair of Lewis structures is not a pair of resonance structures?

Correct AnswerverifiedShow Answer

In which one of the following structures does the central atom have a formal charge of +2?

Correct AnswerverifiedShow Answer

How many dots does the Lewis dot symbol for carbon have around it?

Correct AnswerverifiedShow Answer

Atoms of elements with low ionization energies tend to form ________ while those with positive electron affinities tend to form ________.

Correct AnswerverifiedShow Answer

The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.

Correct AnswerverifiedShow Answer

How many dots does the Lewis dot symbol for sodium have around it?

Correct AnswerverifiedShow Answer

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

Correct AnswerverifiedShow Answer

In which one of the following is the best Lewis structure a resonance structure?

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Which of the following contains covalent bonds?

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The Lewis dot symbol for the calcium ion is

Correct AnswerverifiedShow Answer

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Correct AnswerverifiedShow Answer

Which of these elements is most likely to exhibit an expanded octet in its compounds?

Correct AnswerverifiedShow Answer

Lewis theorized the octet rule to describe chemical bonding where atoms lose, gain, or share electrons in order to achieve a noble gas configuration.

Correct AnswerverifiedShow Answer

A single bond between two atoms represents ________ pair(s) of electrons.

Correct AnswerverifiedShow Answer

Unshared electrons are always shown in pairs around an atom.

Correct AnswerverifiedShow Answer

What is the formal charge on the fluorine in ClF2+?

Correct AnswerverifiedShow Answer

The number of resonance structures for the nitrate ion that satisfy the octet rule is

Correct AnswerverifiedShow Answer

Ionic compounds may carry a net positive or net negative charge.

Correct AnswerverifiedShow Answer

Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is

Correct AnswerverifiedShow Answer

The Lewis dot symbol for the chloride ion is

Correct AnswerverifiedShow Answer

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Atoms of elements with low ionization energies tend to form while those with positive electron affinities tend to form .

Correct Answer
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The lattice energy for ionic crystals increases as the charge on the ions and the size of the ions .

Correct Answer
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Select the Lewis structure for XeO₂F₂ which correctly minimizes formal charges.

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Hydrazine, N₂H₄, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Correct Answer
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What is the formal charge on the fluorine in ClF₂⁺?

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