Question 1

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) A) and C)

Question 2

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

Question 3

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

Accepted Answer

A)  H2S
B)  HCN
C)  BF3
D)  H2CO
E)  SO3F) All of the above
G) A) and D)

Question 4

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

Question 5

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

Accepted Answer

A)   3? 
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G) C) and D)

Question 6

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

Question 7

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) C) and E)
G) A) and C)

Question 8

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

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

Question 10

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) A) and B)
G) C) and D)

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) B) and D)
G) A) and C)

Question 12

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

Question 13

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) A) and C)
G) None of the above

Question 14

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) B) and E)
G) B) and C)

Question 15

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) C) and D)
G) C) and E)

Question 16

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 C)
G) A) and E)

Question 17

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

Question 18

The total number of lone pairs in NCl3 is

Accepted Answer

A)  6.
B)  8.
C)  9.
D)  10.
E)  13.F) B) and D)
G) B) and C)

Question 19

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) C) and D)
G) A) and D)

Question 20

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

Exam 6: Molecular Shape

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

Correct AnswerverifiedShow Answer

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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Ammonia's unusually high melting point is the result of

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

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The total number of lone pairs in NCl3 is

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

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Predict the molecular geometry and polarity of the CS2 molecule.

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

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

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

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

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

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

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

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

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

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

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

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

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

Correct Answer
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The total number of lone pairs in NCl₃ is

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

Correct Answer
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Predict the molecular geometry and polarity of the CS₂ molecule.

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

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

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

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

Correct Answer
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