Question 1

Rank the following species in order of increasing nitrogen-oxygen bond energy: NO+, NO2-, NO3-.

Accepted Answer

In order from larges...

Question 2

Identify the molecule below that contains a double bond.

Accepted Answer

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

Question 3

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

Accepted Answer

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

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 C)
F) A) and D)

Question 5

Which of the following bonds is considered to be ionic: C__O, Ca__l, S__N, and Si__O.
Explain why.

Accepted Answer

Ca__Cl is considered...

Question 6

The formal charge on the sulfur atom in the Lewis structure for sulfur dioxide (SO2)  that minimizes the formal charges is ________

Accepted Answer

A)  0.
B)   +1.
C)   -1.
D)   +2.
E)   -2.F) B) and E)
G) All of the above

Question 7

Which one of the following molecules violates the octet rule?

Accepted Answer

A)   SF4
B)   COF2
C)   PBr3
D)   S2Cl2
E)   SiH4F) A) and E)
G) D) and E)

Question 8

Nitrite (NO2-)  is an important nutrient in the eutrophic zone of the ocean. Which of the following is the correct set of resonance structures for this ion? 2-)  is an important nutrient in the eutrophic zone of the ocean. Which of the following is the correct set of resonance structures for this ion?   A)  I B)  II C)  III D)  IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) B) and C)
F) All of the above

Question 9

Indicate which molecule contains the largest number of nonbonding electrons.

Accepted Answer

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

Question 10

What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (CH2O) ?

Accepted Answer

A)   8
B)   6
C)   4
D)   2
E)   10F) All of the above
G) A) and B)

Question 11

Draw the Lewis structure for the nitrate anion, NO3-. Include resonance structures if necessary.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> Two other structures should b...

Question 12

Based on the positions of the atoms in the periodic table, arrange the following bonds in order of increasing bond length: H__H, H__Br, H__Cl.

Accepted Answer

The answer of Based on the positions of the atoms...

Question 13

Which of the following is the longest bond? The number in parentheses is the bond energy.

Accepted Answer

A)   C-C (348 kJ/mol) 
B)   C-F (453 kJ/mol) 
C)   C-H (411 kJ/mol) 
D)   C-Cl (339 kJ/mol) 
E)   C-O (358 kJ/mol) F) A) and B)
G) D) and E)

Question 14

Which one of the molecules below has 10 electrons around the central atom in a Lewis structure that has all atoms with a formal charge of zero?
I. POCl3
II. PF3
III. SO3
IV. SOF2

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   IV only
E)   both I and IVF) A) and E)
G) B) and E)

Question 15

Hydrogen cyanide (HCN)  and hydrogen isocyanide (HNC)  have the same elemental composition except H is bonded to carbon in one and to nitrogen in the other. Which statement regarding the Lewis structures of these molecules is not correct?

Accepted Answer

A)   Both have 10 valence electrons.
B)   The formal charges are zero for all the atoms in only one of these molecules.
C)   The most electronegative element has a formal charge of -1 in one of these molecules.
D)   The Lewis structures predict that HCN is the more stable molecule.
E)   The formal charges sum to zero in both molecules.F) D) and E)
G) A) and E)

Question 16

How many valence electrons does aluminum have?

Accepted Answer

A)   1
B)   2
C)   3
D)   11
E)   13F) D) and E)
G) B) and E)

Question 17

Electronegativity increases from left to right across a period because of ________

Accepted Answer

A)   increased shielding of valence electrons by the core electrons.
B)   an increase in the number of protons in the nucleus.
C)   a decrease in the effective nuclear charge (Zeff) .
D)   an increase in the shielding of core electrons by the valence electrons.
E)   a decrease in the ionization potential.F) A) and C)
G) A) and B)

Question 18

Which of the following compounds is likely to have the least reactive hydrogen?

Accepted Answer

A)   H--Br (141 pm) 
B)   H--I (161 pm) 
C)   H--Cl (127 pm) 
D)   H--F (92 pm) 
E)   H2S (134m) F) A) and B)
G) C) and D)

Question 19

Which of the following bonds is the weakest?

Accepted Answer

A)   C--O
B)   C=O
C)   O=O
D)  O?OE) C) and D)
F) A) and B)

Question 20

In comparing the length and strength of single, double, and triple bonds between the same pair of atoms, the ______

Accepted Answer

A)   shorter bond will be the stronger bond.
B)   shorter bond will be the weaker bond.
C)   longer bond can be either weaker or stronger than the other.
D)   bond length and bond strength are not related.
E)   longer bond will be the stronger bond.F) A) and E)
G) A) and D)

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

What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (CH2O) ?

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Which one of the following molecules violates the octet rule?

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Which of the following bonds is considered to be ionic: C__O, Ca__l, S__N, and Si__O. Explain why.

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In comparing the length and strength of single, double, and triple bonds between the same pair of atoms, the ______

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The formal charge on the sulfur atom in the Lewis structure for sulfur dioxide (SO2) that minimizes the formal charges is ________

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Indicate which molecule contains the largest number of nonbonding electrons.

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Which one of the molecules below has 10 electrons around the central atom in a Lewis structure that has all atoms with a formal charge of zero? I. POCl3 II. PF3 III. SO3 IV. SOF2

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Which of the following compounds is likely to have the least reactive hydrogen?

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Electronegativity increases from left to right across a period because of ________

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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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Nitrite (NO2-) is an important nutrient in the eutrophic zone of the ocean. Which of the following is the correct set of resonance structures for this ion?

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Draw the Lewis structure for the nitrate anion, NO3-. Include resonance structures if necessary.

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Identify the molecule below that contains a double bond.

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Which of the following bonds is the weakest?

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Which of the following is the longest bond? The number in parentheses is the bond energy.

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Rank the following species in order of increasing nitrogen-oxygen bond energy: NO+, NO2-, NO3-.

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

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How many valence electrons does aluminum have?

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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: H__H, H__Br, H__Cl.

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Hydrogen cyanide (HCN) and hydrogen isocyanide (HNC) have the same elemental composition except H is bonded to carbon in one and to nitrogen in the other. Which statement regarding the Lewis structures of these molecules is not correct?

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What is the total number of electrons assigned to the oxygen atom in the Lewis structure of formaldehyde (CH₂O) ?

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Which of the following bonds is considered to be ionic: CO, Cal, SN, and SiO. Explain why.

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Ca__Cl is considered...
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The formal charge on the sulfur atom in the Lewis structure for sulfur dioxide (SO₂) that minimizes the formal charges is ________

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Which one of the molecules below has 10 electrons around the central atom in a Lewis structure that has all atoms with a formal charge of zero? I. POCl₃ II. PF₃ III. SO₃ IV. SOF₂

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Nitrite (NO₂^-) is an important nutrient in the eutrophic zone of the ocean. Which of the following is the correct set of resonance structures for this ion?

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Draw the Lewis structure for the nitrate anion, NO₃^-. Include resonance structures if necessary.

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Two other structures should b...
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Rank the following species in order of increasing nitrogen-oxygen bond energy: NO⁺, NO₂^-, NO₃^-.

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In order from larges...
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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: HH, HBr, H__Cl.

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