Question 1

How many lone-pair electrons are on the central atom of xenon tetrachloride? (XeCl4) ?

Accepted Answer

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

Question 2

Which of the following molecules cannot absorb infrared radiation?

Accepted Answer

A)   HCl
B)   CH4
C)   N2
D)   C6H6
E)   COF) A) and C)
G) D) and E)

Question 3

How many valence electrons are there in BrO-?

Accepted Answer

A)   7
B)   6
C)   13
D)   14
E)   18F) All of the above
G) C) and D)

Question 4

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) A) and E)
G) A) and B)

Question 5

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

Accepted Answer

A)   NO
B)   CO
C)   HBr
D)   I2
E)   N2OF) A) and E)
G) A) and C)

Question 6

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

Accepted Answer

A)   Al3+
B)   I-
C)   Ca2+
D)   Pb2+
E)   S2-F) B) and C)
G) A) and E)

Question 7

Indicate which one of the following does not contain a polar covalent bond.

Accepted Answer

A)   I2
B)   CO
C)   HF
D)   NO
E)   CN-F) B) and C)
G) A) and E)

Question 8

Using the positions of the atoms in the periodic table, identify which of the following bonds is expected to be most polar: C__F, Cl__F, Si__F, S__F, O__F.

Accepted Answer

The answer of Using the positions of the atoms in...

Question 9

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) B) and D)
G) A) and E)

Question 10

Which statement about the most stable Lewis structures of cyanamide (H2NCN)  and its structural isomer (HNCNH)  is not correct?

Accepted Answer

A)   Both have 16 valence electrons.
B)   One has a triple bond.
C)   One has two double bonds.
D)   All atoms in both structures have formal charges of zero.
E)   Cyanamide has an equivalent resonance structure with two double bonds.F) A) and B)
G) A) and C)

Question 11

Which of the following double bonds do you predict to be the shortest based on the position of the atoms in the periodic table?

Accepted Answer

A)    C=O \mathrm{C}=\mathrm{O} C=O 
B)    N=O \mathrm{N}=\mathrm{O} N=O 
C)    S=O \mathrm{S}=\mathrm{O} S=O 
D)    N=N \mathrm{N}=\mathrm{N} N=N  E) A) and D)
F) All of the above

Question 12

Hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) have the same elemental composition. Is one structure more stable than the other? Support your answer with the Lewis structures and formal charges assigned to each atom for these molecules.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> The formal charges are zero u...

Question 13

Which of the following bonds is least polar?

Accepted Answer

A)   H--O
B)   H--N
C)   H--B
D)   H--C
E)   H--FF) B) and C)
G) A) and E)

Question 14

Which of the following represents the best Lewis structure for dinitrogen sulfide?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) All of the above
G) B) and E)

Question 15

How many covalent bonds are there in CN-?

Accepted Answer

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

Question 16

Indicate the ion that does not have 8 valence electrons.

Accepted Answer

A)   O-
B)   Na+
C)   Al3+
D)   P3-
E)   ArF) B) and E)
G) A) and B)

Question 17

The complete combustion of carbon compounds produces carbon dioxide. The reaction of coal with water at high temperatures produces synthesis gas, which is a mixture of carbon monoxide and hydrogen. Use the bond energies in the table below to estimate how much more energy is released by reaction I than by reaction II; that is, estimate Δ\DeltaΔ HI -  Δ\DeltaΔ HII.
(I)  C(g)  + O2(g)   →ightarrow→ CO2(g) 
(II)  C(g)  + H2O(g)   →ightarrow→  CO(g)  + H2(g)    Bond OCCO−HH−H==≡OOO Energy (kJ/mol) 4957701,070465435\begin{array} { | l | c | c | c | c | c | } \hline 	ext { Bond } & \mathrm { O } & \mathrm { C } & \mathrm { C } & \mathrm { O } - \mathrm { H } & \mathrm { H } - \mathrm { H } \& = & = & \equiv & & \& \mathrm { O } & \mathrm { O } & \mathrm { O } & & \\hline 	ext { Energy } ( \mathrm { kJ } / \mathrm { mol } )  & 495 & 770 & 1,070 & 465 & 435 \\hline\end{array} Bond  Energy (kJ/mol) ​O=O495​C=O770​C≡O1,070​O−H465​H−H435​​

Accepted Answer

A)   470 kJ/mol
B)   770 kJ/mol
C)   275 kJ/mol
D)   575 kJ/mol
E)   1,045 kJ/mol F) C) and D)
G) A) and E)

Question 18

Which sequence does not have the elements arranged correctly in order of increasing electronegativity?

Accepted Answer

A)   I 
B)   B 
C)   H 
D)   H 
E)   Al < S < ClF) B) and D)
G) C) and D)

Question 19

Which of the following atoms can have an expanded octet?

Accepted Answer

A)   S
B)   C
C)   N
D)   B
E)   BeF) A) and B)
G) A) and E)

Question 20

In a chemical reaction, bonds are broken and new bonds are formed. Which one of the following statements regarding bond energies is correct?

Accepted Answer

A)   Energy is released when bonds are broken.
B)   Energy is released when bonds are broken and more stable bonds are formed.
C)   Energy is released when bonds are broken and less stable bonds are formed.
D)   Bond energies and bond lengths generally are not correlated; that is, they vary independently.
E)   Bond energies and bond order are unrelated to each other.F) A) and B)
G) A) and C)

Exam 8: Chemical Bonds: What Makes a Gas a Greenhouse Gas

Which of the following double bonds do you predict to be the shortest based on the position of the atoms in the periodic table?

Correct Answer
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Which of the following molecules contains an exception to the octet rule?

Correct Answer
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Which statement about the most stable Lewis structures of cyanamide (H₂NCN) and its structural isomer (HNCNH) is not correct?

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

Correct Answer
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Correct Answer
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Hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) have the same elemental composition. Is one structure more stable than the other? Support your answer with the Lewis structures and formal charges assigned to each atom for these molecules.

Correct Answer
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The formal charges are zero u...
View Answer

Which sequence does not have the elements arranged correctly in order of increasing electronegativity?

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

Correct Answer
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In a chemical reaction, bonds are broken and new bonds are formed. Which one of the following statements regarding bond energies is correct?

Correct Answer
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Which of the following bonds is least polar?

Correct Answer
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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?

Correct Answer
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Which of the following atoms can have an expanded octet?

Correct Answer
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Indicate the ion that does not have 8 valence electrons.

Correct Answer
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Using the positions of the atoms in the periodic table, identify which of the following bonds is expected to be most polar: CF, ClF, SiF, SF, O__F.

Correct Answer
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Which of the following molecules cannot absorb infrared radiation?

Correct Answer
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Which of the following represents the best Lewis structure for dinitrogen sulfide?

Correct Answer
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Indicate which one of the following does not contain a polar covalent bond.

Correct Answer
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How many covalent bonds are there in CN^-?

Correct Answer
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How many valence electrons are there in BrO^-?

Correct Answer
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How many lone-pair electrons are on the central atom of xenon tetrachloride? (XeCl₄) ?

Correct Answer
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Exam 8: Chemical Bonds: What Makes a Gas a Greenhouse Gas

Which of the following double bonds do you predict to be the shortest based on the position of the atoms in the periodic table?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement about the most stable Lewis structures of cyanamide (H2NCN) and its structural isomer (HNCNH) is not correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) have the same elemental composition. Is one structure more stable than the other? Support your answer with the Lewis structures and formal charges assigned to each atom for these molecules.

Correct Answerverified The formal charges are zero u...View AnswerShow Answer

Which sequence does not have the elements arranged correctly in order of increasing electronegativity?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a chemical reaction, bonds are broken and new bonds are formed. Which one of the following statements regarding bond energies is correct?

Correct AnswerverifiedShow Answer

Which of the following bonds is least polar?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Which of the following atoms can have an expanded octet?

Correct AnswerverifiedShow Answer

Indicate the ion that does not have 8 valence electrons.

Correct AnswerverifiedShow Answer

Using the positions of the atoms in the periodic table, identify which of the following bonds is expected to be most polar: C__F, Cl__F, Si__F, S__F, O__F.

Correct AnswerverifiedShow Answer

Which of the following molecules cannot absorb infrared radiation?

Correct AnswerverifiedShow Answer

Which of the following represents the best Lewis structure for dinitrogen sulfide?

Correct AnswerverifiedShow Answer

Indicate which one of the following does not contain a polar covalent bond.

Correct AnswerverifiedShow Answer

How many covalent bonds are there in CN-?

Correct AnswerverifiedShow Answer

How many valence electrons are there in BrO-?

Correct AnswerverifiedShow Answer

How many lone-pair electrons are on the central atom of xenon tetrachloride? (XeCl4) ?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Which statement about the most stable Lewis structures of cyanamide (H₂NCN) and its structural isomer (HNCNH) is not correct?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
The formal charges are zero u...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

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?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Using the positions of the atoms in the periodic table, identify which of the following bonds is expected to be most polar: CF, ClF, SiF, SF, O__F.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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How many covalent bonds are there in CN^-?

Correct Answer
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How many valence electrons are there in BrO^-?

Correct Answer
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How many lone-pair electrons are on the central atom of xenon tetrachloride? (XeCl₄) ?

Correct Answer
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