Question 1

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

Accepted Answer

A)  SO2 
B)  HCl 
C)  CS2 
D)  CO 
E)  Cl2O 
A)  SO2 
B)  HCl 
C)  CS2 
D)  CO 
E)  Cl2O

Question 2

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

Question 3

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 4

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 pyramidal 
A)  bent 
B)  linear 
C)  trigonal planar 
D)  T-shaped 
E)  trigonal pyramidal

Question 5

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)  +2 
A)  -2 
B)  -1 
C)  0 
D)  +1 
E)  +2

Question 6

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° 
A)  120° only 
B)  90° only 
C)  180° only 
D)  60° and 90° only 
E)  90°, 120°, and 180°

Question 7

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

Question 8

Select the correct Lewis structure for nitrogen trifluoride, NF3.

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 9

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)  octahedral 
A)  tetrahedral 
B)  trigonal planar 
C)  trigonal bipyramidal 
D)  hexagonal 
E)  octahedral

Question 10

Which one of the following molecules contains a double bond?

Accepted Answer

A)  N2 
B)  PCl5 
C)  CH2O 
D)  C2H2 
E)  I2 
A)  N2 
B)  PCl5 
C)  CH2O 
D)  C2H2 
E)  I2

Question 11

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 pyramidal 
A)  linear 
B)  trigonal planar 
C)  V-shaped 
D)  tetrahedral 
E)  trigonal pyramidal

Question 12

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

Question 13

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- 
A)  SO3 
B)  BF3 
C)  I3- 
D)  SCO (C = central atom) 
E)  SO32-

Question 14

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

Question 15

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

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

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

Question 19

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 20

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-saw 
A)  linear 
B)  bent 
C)  trigonal planar 
D)  tetrahedral 
E)  see-saw

Exam 10: The Shapes of Molecules

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

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

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.

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

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

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

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

Select the correct Lewis structure for nitrogen trifluoride, NF3.

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

Which one of the following molecules contains a double bond?

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

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

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

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

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.)

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

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

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

Which one of the following Lewis structures is definitely incorrect?

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

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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

Select the correct Lewis structure for nitrogen trifluoride, NF₃.

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

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

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.)

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

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

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