Question 1

In which one of the following is the best Lewis structure a resonance structure?

Accepted Answer

A)   SO3
B)   BF3
C)   I3-
D)   SCO (C = central atom) 
E)   SO32-F) C) and D)
G) All of the above

Question 2

Which one of the following molecules has a zero dipole moment?

Accepted Answer

A)   SO2
B)   HCl
C)   CS2
D)   CO
E)   Cl2OF) A) and D)
G) A) and C)

Question 3

According to VSEPR theory, a molecule with the general formula AX2E3 will have a _____ molecular shape.

Accepted Answer

A)   bent
B)   linear
C)   trigonal planar
D)   T-shaped
E)   trigonal pyramidalF) A) and E)
G) A) and C)

Question 4

According to VSEPR theory, a molecule with the general formula AX6 will have a ______ molecular shape.

Accepted Answer

A)   tetrahedral
B)   trigonal planar
C)   trigonal bipyramidal
D)   hexagonal
E)   octahedralF) C) and E)
G) C) and D)

Question 5

In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

Accepted Answer

A) True 
 B)False

Question 6

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

Accepted Answer

A)   90°
B)   109°
C)   120°
D)   180°
E)   between 120 and 180°F) B) and E)
G) C) and D)

Question 7

Which one of the following molecules and ions will have a planar geometry?

Accepted Answer

A)   PCl3
B)   BF4-
C)   XeF4
D)   BrF5
E)   H3O+F) A) and B)
G) A) and C)

Question 8

Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure.

Accepted Answer

A)   
B)   
C)   
D)   
E)   None of these choices are correct.F) B) and E)
G) C) and D)

Question 9

What is the molecular shape of BeH2 as predicted by the VSEPR theory?

Accepted Answer

A)   linear
B)   bent
C)   angular
D)   trigonal
E)   None of these choices are correct.F) A) and B)
G) A) and C)

Question 10

According to VSEPR theory, a molecule with the general formula AX2E2 will have a _____ molecular shape.

Accepted Answer

A)   linear
B)   bent
C)   trigonal planar
D)   tetrahedral
E)   see-sawF) A) and B)
G) C) and E)

Question 11

The molecule AX2, where A and X are different elements, will have a dipole moment if the molecule is bent.

Accepted Answer

A) True 
 B)False

Question 12

How many faces and how many vertexes (corners) , respectively, are there in a trigonal bipyramid?

Accepted Answer

A)   4 and 4
B)   5 and 5
C)   5 and 6
D)   6 and 5
E)   6 and 8F) A) and E)
G) A) and C)

Question 13

Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

Accepted Answer

A)   120° only
B)   90° only
C)   180° only
D)   60° and 90° only
E)   90°, 120°, and 180°F) All of the above
G) A) and B)

Question 14

Select the correct Lewis structure for nitrogen trifluoride, NF3.

Accepted Answer

A)   3. 
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B)     
C)     
D)     
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C)   3. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   3. 
A)     
B)     
C)     
D)     
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E)   3. 
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G) D) and E)

Question 15

Which one of the following molecules contains a double bond?

Accepted Answer

A)   N2
B)   PCl5
C)   CH2O
D)   C2H2
E)   I2F) A) and E)
G) C) and E)

Question 16

In formaldehyde, CH2O, both the formal charge and the oxidation number of carbon are zero.

Accepted Answer

A) True 
 B)False

Question 17

What is the molecular symmetry around the carbons in CCl2CH2 as predicted by the VSEPR theory?

Accepted Answer

A)   linear
B)   trigonal planar
C)   V-shaped
D)   tetrahedral
E)   trigonal pyramidalF) D) and E)
G) B) and D)

Question 18

Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.

Accepted Answer

A)   
B)   
C)   
D)   
E)   None of these choices are correct.F) B) and C)
G) All of the above

Question 19

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

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

Question 20

The formal charge on Cl in the structure shown for the perchlorate ion is

Accepted Answer

A)   -2
B)   -1
C)   0
D)   +1
E)   +2F) A) and E)
G) None of the above

Exam 10: The Shapes of Molecules

According to VSEPR theory, a molecule with the general formula AX2E3 will have a _____ molecular shape.

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Which one of the following molecules has a zero dipole moment?

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In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

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Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

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Which one of the following molecules contains a double bond?

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Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.

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Select the correct Lewis structure for nitrogen trifluoride, NF3.

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What is the molecular shape of BeH2 as predicted by the VSEPR theory?

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How many faces and how many vertexes (corners) , respectively, are there in a trigonal bipyramid?

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Which one of the following Lewis structures is definitely incorrect?

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In formaldehyde, CH2O, both the formal charge and the oxidation number of carbon are zero.

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What is the molecular symmetry around the carbons in CCl2CH2 as predicted by the VSEPR theory?

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Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

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According to VSEPR theory, a molecule with the general formula AX6 will have a ______ molecular shape.

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Which one of the following molecules and ions will have a planar geometry?

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The formal charge on Cl in the structure shown for the perchlorate ion is

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According to VSEPR theory, a molecule with the general formula AX2E2 will have a _____ molecular shape.

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Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure.

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In which one of the following is the best Lewis structure a resonance structure?

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The molecule AX2, where A and X are different elements, will have a dipole moment if the molecule is bent.

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According to VSEPR theory, a molecule with the general formula AX₂E₃ will have a _____ molecular shape.

Correct Answer
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Select the correct Lewis structure for nitrogen trifluoride, NF₃.

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In formaldehyde, CH₂O, both the formal charge and the oxidation number of carbon are zero.

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What is the molecular symmetry around the carbons in CCl₂CH₂ as predicted by the VSEPR theory?

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Predict the ideal bond angles around nitrogen in N₂F₂ using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

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According to VSEPR theory, a molecule with the general formula AX₆ will have a ______ molecular shape.

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According to VSEPR theory, a molecule with the general formula AX₂E₂ will have a _____ molecular shape.

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The molecule AX₂, where A and X are different elements, will have a dipole moment if the molecule is bent.

Correct Answer
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