Question 1

Select the correct Lewis structure for nitrogen trifluoride, NF3.

Accepted Answer

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

Question 2

Bond angles of 180 $\degree$ only occur around atoms which display linear molecular geometry.

Accepted Answer

A) True 
 B)False

Question 3

Predict the actual bond angles in SF3+ using the VSEPR theory.

Accepted Answer

A)  more than 120 $\degree$ 
B)  exactly 120 $\degree$ 
C)  between 109 $\degree$ and 120 $\degree$ 
D)  between 90 $\degree$and 109 $\degree$ 
E)  less than 90 $\degree$ 
A)  more than 120 $\degree$ 
B)  exactly 120 $\degree$ 
C)  between 109 $\degree$ and 120 $\degree$ 
D)  between 90 $\degree$and 109 $\degree$ 
E)  less than 90 $\degree$

Question 4

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

Accepted Answer

A)  NH3 
B)  NH4+ 
C)  I2 
D)  BH4¯ 
E)  SF6 
A)  NH3 
B)  NH4+ 
C)  I2 
D)  BH4¯ 
E)  SF6

Question 5

The formal charges on Cl and O in the structure shown for the ClO¯ ion are, respectively:

Accepted Answer

A)  0 and -1 
B)  -1 and 0 
C)  1 and -2 
D)  -2 and 1 
E)  None of these choices is correct. 
A)  0 and -1 
B)  -1 and 0 
C)  1 and -2 
D)  -2 and 1 
E)  None of these choices is correct.

Question 6

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 7

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 8

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

Accepted Answer

A)  BrF3 
B)  H3O+ 
C)  PCl3 
D)  SO42¯ 
E)  SF4 
A)  BrF3 
B)  H3O+ 
C)  PCl3 
D)  SO42¯ 
E)  SF4

Question 9

Predict the smallest actual bond angle in BrF3 using the VSEPR theory.

Accepted Answer

A)  more than 120 $\degree$ 
B)  exactly 120 $\degree$ 
C)  between 109 $\degree$ and 120 $\degree$ 
D)  between 90 $\degree$ and 109 $\degree$ 
E)  less than 90 $\degree$ 
A)  more than 120 $\degree$ 
B)  exactly 120 $\degree$ 
C)  between 109 $\degree$ and 120 $\degree$ 
D)  between 90 $\degree$ and 109 $\degree$ 
E)  less than 90 $\degree$

Question 10

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 11

Which of the following has no net dipole moment?

Accepted Answer

A)  N2O 
B)  NF3 
C)  H2Se 
D)  TeO3 
E)  CH3Cl 
A)  N2O 
B)  NF3 
C)  H2Se 
D)  TeO3 
E)  CH3Cl

Question 12

Using SO2 as an example, describe the sort of experimental data which might suggest that no single Lewis structure is an accurate representation of its bonding.

Accepted Answer

In the SO₂ molecule, the two sulfur-oxyge

Question 13

What is the molecular shape of NH2Cl as predicted by the VSEPR theory?

Accepted Answer

A)  trigonal pyramidal 
B)  tetrahedral 
C)  T-shaped 
D)  see-saw 
E)  trigonal planar 
A)  trigonal pyramidal 
B)  tetrahedral 
C)  T-shaped 
D)  see-saw 
E)  trigonal planar

Question 14

Predict the ideal bond angles in FNO using the molecular shape given by the VSEPR theory.

Accepted Answer

A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  180 $\degree$ 
E)  between 120 and 180 $\degree$ 
A)  90 $\degree$ 
B)  109 $\degree$ 
C)  120 $\degree$ 
D)  180 $\degree$ 
E)  between 120 and 180 $\degree$

Question 15

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

Accepted Answer

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

Question 16

Select the best Lewis structure for P2I4.

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of these structures is suitable for P2I4. 
A)    
B)    
C)    
D)    
E)  None of these structures is suitable for P2I4.

Question 17

In neutral molecules, how many bonds are commonly formed by nitrogen? And how many by oxygen?

Accepted Answer

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

Question 18

Use VSEPR theory to predict the electron group arrangement around iodine, the central atom in the ion IF2¯.

Accepted Answer

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

Question 19

In carbon disulfide, how many lone pairs of electrons are on each sulfur atom?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 20

Predict the actual bond angle in SeCl2 using the VSEPR theory.

Accepted Answer

A)  more than 120 $\degree$ 
B)  between 109 $\degree$ and 120 $\degree$ 
C)  between 90 $\degree$and 109 $\degree$ 
D)  exactly 90 $\degree$ 
E)  less than 90 $\degree$ 
A)  more than 120 $\degree$ 
B)  between 109 $\degree$ and 120 $\degree$ 
C)  between 90 $\degree$and 109 $\degree$ 
D)  exactly 90 $\degree$ 
E)  less than 90 $\degree$

Exam 10: The Shapes of Molecules

Select the correct Lewis structure for nitrogen trifluoride, NF3.

Bond angles of 180 °\degree° only occur around atoms which display linear molecular geometry.

Predict the actual bond angles in SF3+ using the VSEPR theory.

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

The formal charges on Cl and O in the structure shown for the ClO¯ ion are, respectively:

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?

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

Predict the smallest actual bond angle in BrF3 using the VSEPR theory.

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

Which of the following has no net dipole moment?

Using SO2 as an example, describe the sort of experimental data which might suggest that no single Lewis structure is an accurate representation of its bonding.

What is the molecular shape of NH2Cl as predicted by the VSEPR theory?

Predict the ideal bond angles in FNO using the molecular shape given by the VSEPR theory.

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

Select the best Lewis structure for P2I4.

In neutral molecules, how many bonds are commonly formed by nitrogen? And how many by oxygen?

Use VSEPR theory to predict the electron group arrangement around iodine, the central atom in the ion IF2¯.

In carbon disulfide, how many lone pairs of electrons are on each sulfur atom?

Predict the actual bond angle in SeCl2 using the VSEPR theory.

Keys to the Study of Chemistry

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the correct Lewis structure for nitrogen trifluoride, NF₃.

Bond angles of 180 $\degree$ only occur around atoms which display linear molecular geometry.

Predict the actual bond angles in SF₃⁺ using the VSEPR theory.

The formal charges on Cl and O in the structure shown for the ClO^¯ ion are, respectively:

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

Predict the smallest actual bond angle in BrF₃ using the VSEPR theory.

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

Using SO₂ as an example, describe the sort of experimental data which might suggest that no single Lewis structure is an accurate representation of its bonding.

What is the molecular shape of NH₂Cl as predicted by the VSEPR theory?

Select the Lewis structure for XeO₂F₂ which correctly minimizes formal charges.

Select the best Lewis structure for P₂I₄.

Use VSEPR theory to predict the electron group arrangement around iodine, the central atom in the ion IF₂^¯.

Predict the actual bond angle in SeCl₂ using the VSEPR theory.