Question 1

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

Question 2

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

Question 3

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 4

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

Question 5

Select the correct Lewis structure for nitrogen trifluoride, NF3.

Accepted Answer

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G) B) and C)

Question 6

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

Question 7

Which one of the following molecules contains a double bond?

Accepted Answer

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

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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 10

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

Question 11

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) A) and D)

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and C)
G) A) and D)

Question 17

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

Question 18

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 C)
G) None of the above

Question 19

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 B)
G) A) and D)

Question 20

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

Exam 10: The Shapes of Molecules

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

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Which one of the following Lewis structures is definitely incorrect?

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Select the correct Lewis structure for nitrogen trifluoride, NF3.

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

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

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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 AX2E2 will have a _____ molecular shape.

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

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

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

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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 molecules and ions will have a planar geometry?

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Which one of the following molecules contains a double bond?

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

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

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

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Select the correct Lewis structure for nitrogen trifluoride, NF₃.

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According to VSEPR theory, a molecule with the general formula AX₂E₃ 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.

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

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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 AX₂E₂ will have a _____ molecular shape.

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

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

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