Question 1

When sulfur-containing fuels are burned, sulfur trioxide (SO3)  is formed in the atmosphere and contributes to acid rain (sulfur trioxide plus water produces sulfuric acid) . How many resonance structures are there for SO3 when each atom satisfies the octet rule?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) A) and B)
G) A) and C)

Question 2

Indicate the element with the smallest electronegativity.

Accepted Answer

A)   Cl
B)   F
C)   Be
D)   K
E)   CF) All of the above
G) C) and D)

Question 3

What is the formal charge of the nitrogen atom in hydrogen cyanide (HCN) ?

Accepted Answer

A)   -1
B)   0
C)   1
D)   5
E)   2F) A) and D)
G) A) and B)

Question 4

Carbon dioxide is a greenhouse gas. Which of the following is the correct Lewis structure for carbon dioxide?

Accepted Answer

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

Question 5

Indicate which molecule contains the largest number of nonbonding electrons.

Accepted Answer

A)   H2
B)   CO
C)   N2
D)   NO
E)   O2F) B) and E)
G) A) and E)

Question 6

Which of the following compounds would have the largest enthalpy of formation? The bond energies are given in parentheses.

Accepted Answer

A)   H Br (366 kJ/mol) 
B)   H I (299 kJ/mol) 
C)   H Cl (431 kJ/mol) 
D)   H F (567 kJ/mol) 
E)   H H (436 kJ/mol) F) All of the above
G) B) and E)

Question 7

In general, resonance __________ electrons and __________ molecules.

Accepted Answer

A)   delocalizes, stabilizes
B)   destabilizes, destabilizes
C)   localizes, stabilizes
D)   delocalizes, destabilizes
E)   Localizes, stabilizesF) B) and D)
G) A) and D)

Question 8

Which of the following ions does not have a complete valence-shell octet?

Accepted Answer

A)   B3+
B)   I-
C)   Ca2+
D)   Pb2+
E)   S2-F) None of the above
G) A) and B)

Question 9

Identify the molecule below that contains a double bond.

Accepted Answer

A)   HCN
B)   O3
C)   C2H2
D)   S2
E)   N2F) B) and E)
G) B) and D)

Question 10

What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H2CO) ?

Accepted Answer

A)   8
B)   6
C)   4
D)   2
E)   10F) None of the above
G) A) and C)

Question 11

Which group of elements is listed in order of increasing electronegativity?

Accepted Answer

A)   F 
B)   Rb 
C)   Zr 
D)   In 
E)   Cl < Br < I < FF) B) and C)
G) A) and B)

Question 12

Indicate which of the following molecules has four shared electrons.

Accepted Answer

A)   O2
B)   CO
C)   HI
D)   N2
E)   Cl2F) A) and E)
G) D) and E)

Question 13

Which molecule has a stretching vibration that is not infrared active?

Accepted Answer

A)   CO2
B)   OCS
C)   H2O
D)   NH3
E)   HClF) D) and E)
G) A) and E)

Question 14

Do you expect the nitrogen-oxygen bond length in the nitrate anion (NO3-) to be the same as in the nitrite anion (NO2-)? Explain why or why not.

Accepted Answer

In examining the Lewis structures to ide...

Question 15

The formal charge on the oxygen atoms in the Lewis structure for sulfur dioxide (SO2)  that minimizes the formal charges is __________

Accepted Answer

A)   0 for both oxygen atoms.
B)   +1 for both oxygen atoms.
C)   -1 for both oxygen atoms.
D)   0 for one oxygen atom, -1 for the other.
E)   +1 for one oxygen atom, -1 for the other.F) D) and E)
G) A) and E)

Question 16

A covalent bond results when __________

Accepted Answer

A)   electrons are transferred from one atom to another atom.
B)   atoms pool their electrons to form a "sea" of electrons.
C)   atoms have outer electrons with the same principal quantum number.
D)   electrons are shared between a pair of atoms.
E)   an atom has 8 valence electrons.F) A) and D)
G) C) and D)

Question 17

Based on the positions of the atoms in the periodic table, arrange the following bonds in order of increasing bond length: C F1F1F1S1F1F1F10F1F1F1S1F1F1F10O, S F1F1F1S1F1F1F10F1F1F1S1F1F1F10O, C F1F1F1S1F1F1F10F1F1F1S1F1F1F10C.

Accepted Answer

C F1F...

Question 18

Identify which of the following molecules has a bond order of 3: Li2, Be2, N2, F2, C2.

Accepted Answer

Question 19

In which of the following molecules does the central atom have an expanded octet?

Accepted Answer

A)   N2O
B)   PCl5
C)   BeF2
D)   AsF3
E)   NO2F) C) and D)
G) All of the above

Question 20

Which one of the following molecules or ions contains an exception to the octet rule?

Accepted Answer

A)   O2
B)   CN-
C)   XeCl
D)   ClO-
E)   SiH4F) A) and B)
G) B) and E)

Exam 8: Chemical Bonding and Climate Change

A covalent bond results when __________

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Which of the following compounds would have the largest enthalpy of formation? The bond energies are given in parentheses.

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The formal charge on the oxygen atoms in the Lewis structure for sulfur dioxide (SO2) that minimizes the formal charges is __________

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Carbon dioxide is a greenhouse gas. Which of the following is the correct Lewis structure for carbon dioxide?

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Indicate which molecule contains the largest number of nonbonding electrons.

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Indicate which of the following molecules has four shared electrons.

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Do you expect the nitrogen-oxygen bond length in the nitrate anion (NO3-) to be the same as in the nitrite anion (NO2-)? Explain why or why not.

Correct AnswerverifiedIn examining the Lewis structures to ide...View AnswerShow Answer

Which of the following ions does not have a complete valence-shell octet?

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Indicate the element with the smallest electronegativity.

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What is the formal charge of the nitrogen atom in hydrogen cyanide (HCN) ?

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In general, resonance __________ electrons and __________ molecules.

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Which molecule has a stretching vibration that is not infrared active?

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Based on the positions of the atoms in the periodic table, arrange the following bonds in order of increasing bond length: C O, S O, C C.

Correct AnswerverifiedC F1F...View AnswerShow Answer

Identify which of the following molecules has a bond order of 3: Li2, Be2, N2, F2, C2.

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Which group of elements is listed in order of increasing electronegativity?

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Which one of the following molecules or ions contains an exception to the octet rule?

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In which of the following molecules does the central atom have an expanded octet?

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Identify the molecule below that contains a double bond.

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When sulfur-containing fuels are burned, sulfur trioxide (SO3) is formed in the atmosphere and contributes to acid rain (sulfur trioxide plus water produces sulfuric acid) . How many resonance structures are there for SO3 when each atom satisfies the octet rule?

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What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H2CO) ?

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The formal charge on the oxygen atoms in the Lewis structure for sulfur dioxide (SO₂) that minimizes the formal charges is __________

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Do you expect the nitrogen-oxygen bond length in the nitrate anion (NO₃^-) to be the same as in the nitrite anion (NO₂^-)? Explain why or why not.

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In examining the Lewis structures to ide...
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In general, resonance electrons and molecules.

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C F1F...
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Identify which of the following molecules has a bond order of 3: Li₂, Be₂, N₂, F₂, C₂.

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When sulfur-containing fuels are burned, sulfur trioxide (SO₃) is formed in the atmosphere and contributes to acid rain (sulfur trioxide plus water produces sulfuric acid) . How many resonance structures are there for SO₃ when each atom satisfies the octet rule?

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What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (H₂CO) ?

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