Question 1

In which one of the following species is the central atom (the first atom in the formula)  likely to violate the octet rule?

Accepted Answer

A)  BF4−
B)  XeO3
C)  SiCl4
D)  NH3
E)  CH2Cl2F) B) and C)
G) None of the above

Question 2

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Accepted Answer

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

Question 3

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl4?

Accepted Answer

A)  90°
B)  109.5°
C)  120°
D)  145°
E)  180°F) A) and B)
G) B) and D)

Question 4

According to the VSEPR model, a molecule with the general formula AB3 with no lone pairs on the central atom will have a ______ molecular shape.

Accepted Answer

A)  linear
B)  bent
C)  trigonal planar
D)  tetrahedral
E)  trigonal pyramidalF) B) and D)
G) A) and E)

Question 5

According to the VSEPR model, which molecule is predicted to be linear?

Accepted Answer

A)  H2S
B)  HCN
C)  BF3
D)  H2CO
E)  SO3F) A) and D)
G) C) and D)

Question 6

Predict the molecular geometry and polarity of the CS2 molecule.

Accepted Answer

A)  linear, polar
B)  linear, nonpolar
C)  tetrahedral, nonpolar
D)  bent, nonpolar
E)  bent, polarF) C) and E)
G) A) and C)

Question 7

Ammonia's unusually high melting point is the result of

Accepted Answer

A)  dipole-dipole forces.
B)  London dispersion forces.
C)  hydrogen bonding.
D)  covalent bonding.
E)  ionic bonding.F) A) and D)
G) A) and E)

Question 8

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32−, is

Accepted Answer

A)  square planar.
B)  tetrahedral.
C)  pyramidal.
D)  trigonal planar.
E)  octahedral.F) A) and B)
G) B) and C)

Question 9

Which is the most reasonable prediction for the H-O-H bond angle in H2O?

Accepted Answer

A)  90°
B)  109.5°
C)  120°
D)  107°
E)  105°F) None of the above
G) B) and E)

Question 10

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

Accepted Answer

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

Question 11

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

Question 12

Place the following in order of increasing electronegativity. N As K Ca

Accepted Answer

A)  K 
B)  N 
C)  As 
D)  N 
E)  K < Ca < As < NF) C) and D)
G) None of the above

Question 13

Which of these choices is the best Lewis structure for ozone, O3?

Accepted Answer

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G) None of the above

Question 14

Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

Accepted Answer

A)  dipole-dipole forces.
B)  ion-dipole forces.
C)  dispersion forces.
D)  dipole-induced dipole forces.
E)  hydrogen bonding.F) A) and E)
G) B) and E)

Question 15

What is the molecular geometry of the thiocyanate anion, SCN−, as predicted by the VSEPR model? (Carbon is the central atom.)

Accepted Answer

A)  linear
B)  bent
C)  tetrahedral
D)  trigonal planar
E)  trigonal pyramidalF) C) and D)
G) A) and B)

Question 16

The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s) , ____ double bond(s) , and ____ lone pair(s) .

Accepted Answer

A)  2, 1, 10
B)  3, 0, 9
C)  2, 1, 8
D)  3, 0, 10
E)  2, 1, 9F) A) and D)
G) B) and D)

Question 17

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO2?

Accepted Answer

A)  1
B)  2
C)  3
D)  0
E)  4F) B) and E)
G) All of the above

Question 18

How many lone pairs of electrons need to be added to complete this Lewis structure?

Accepted Answer

A)  5
B)  10
C)  0
D)  1
E)  6F) None of the above
G) A) and B)

Question 19

The total number of lone pairs in NCl3 is

Accepted Answer

A)  6.
B)  8.
C)  9.
D)  10.
E)  13.F) None of the above
G) B) and E)

Question 20

How many total resonance structures can be drawn for the sulfate ion, SO42−?

Accepted Answer

A)  2
B)  3
C)  4
D)  5
E)  6F) B) and E)
G) A) and B)

Exam 6: Molecular Shape

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

Correct AnswerverifiedShow Answer

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO2?

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Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

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The total number of lone pairs in NCl3 is

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Which is the most reasonable prediction for the H-O-H bond angle in H2O?

Correct AnswerverifiedShow Answer

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the molecular geometry of the thiocyanate anion, SCN−, as predicted by the VSEPR model? (Carbon is the central atom.)

Correct AnswerverifiedShow Answer

According to the VSEPR model, a molecule with the general formula AB3 with no lone pairs on the central atom will have a ______ molecular shape.

Correct AnswerverifiedShow Answer

According to the VSEPR model, which molecule is predicted to be linear?

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Which of these choices is the best Lewis structure for ozone, O3?

Correct AnswerverifiedShow Answer

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl4?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32−, is

Correct AnswerverifiedShow Answer

Ammonia's unusually high melting point is the result of

Correct AnswerverifiedShow Answer

How many lone pairs of electrons need to be added to complete this Lewis structure?

Correct AnswerverifiedShow Answer

How many total resonance structures can be drawn for the sulfate ion, SO42−?

Correct AnswerverifiedShow Answer

Place the following in order of increasing electronegativity. N As K Ca

Correct AnswerverifiedShow Answer

The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s) , ____ double bond(s) , and ____ lone pair(s) .

Correct AnswerverifiedShow Answer

Predict the molecular geometry and polarity of the CS2 molecule.

Correct AnswerverifiedShow Answer

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What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO₂?

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Helium atoms do not combine to form He₂ molecules, yet He atoms do attract one another weakly through

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The total number of lone pairs in NCl₃ is

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Which is the most reasonable prediction for the H-O-H bond angle in H₂O?

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What is the molecular geometry of the thiocyanate anion, SCN⁻, as predicted by the VSEPR model? (Carbon is the central atom.)

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According to the VSEPR model, a molecule with the general formula AB₃ with no lone pairs on the central atom will have a ______ molecular shape.

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Which of these choices is the best Lewis structure for ozone, O₃?

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According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl₄?

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

Correct Answer
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According to the VSEPR model, the molecular geometry of the carbonate ion, CO₃²⁻, is

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How many total resonance structures can be drawn for the sulfate ion, SO₄²⁻?

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The Lewis structure for a chlorate ion, ClO₃^-, should show single bond(s) , double bond(s) , and lone pair(s) .

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Predict the molecular geometry and polarity of the CS₂ molecule.

Correct Answer
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