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

According to VSEPR theory, a molecule with the general formula AX2 will have a __________ molecular shape.

Accepted Answer

A) linear 
B) bent 
C) trigonal planar 
D) tetrahedral 
E) triangular 
A) linear 
B) bent 
C) trigonal planar 
D) tetrahedral 
E) triangular

Question 3

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl2.

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 4

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

Accepted Answer

A) NH 3 
B) CO 2 
C) SF 6 
D) O 2 
E) CO 3 2− 
A) NH 3 
B) CO 2 
C) SF 6 
D) O 2 
E) CO 3 2−

Question 5

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

Accepted Answer

A) SO 3 
B) BF 3 
C) I 3 − 
D) SCO (C = central atom) 
E) SO 3 2− 
A) SO 3 
B) BF 3 
C) I 3 − 
D) SCO (C = central atom) 
E) SO 3 2−

Question 6

In the hemoglobin molecule that carries oxygen molecules in blood, iron has 6 single bonds to surrounding atoms. What is the most likely geometry of these bonds to iron?

Accepted Answer

A) Planar 
B) Linear 
C) Tetrahedral 
D) Octahedral 
E) Trigonal pyramidal 
A) Planar 
B) Linear 
C) Tetrahedral 
D) Octahedral 
E) Trigonal pyramidal

Question 7

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. 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 8

Which of the following has no net dipole moment?

Accepted Answer

A) N 2O 
B) NF 3 
C) H 2Se 
D) TeO 3 
E) CH 3Cl 
A) N 2O 
B) NF 3 
C) H 2Se 
D) TeO 3 
E) CH 3Cl

Question 9

The best Lewis structure for sulfuric acid has zero formal charges, sulfur as the central atom, and no bonds between S and H. How many single and double bonds, respectively, are there in this Lewis structure?

Accepted Answer

A) 2 single, 4 double 
B) 4 single, 2 double 
C) 4 single, no double 
D) 6 single, no double 
E) 5 single, 1 double 
A) 2 single, 4 double 
B) 4 single, 2 double 
C) 4 single, no double 
D) 6 single, no double 
E) 5 single, 1 double

Question 10

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 11

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

Accepted Answer

A) more than 120° 
B) between 109° and 120° 
C) between 90° and 109° 
D) exactly 90° 
E) less than 90° 
A) more than 120° 
B) between 109° and 120° 
C) between 90° and 109° 
D) exactly 90° 
E) less than 90°

Question 12

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 13

Select the Lewis structure in which formal charges are minimized for the periodate anion, IO4−.

Accepted Answer

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

Question 14

What is the molecular shape of N2O as predicted by the VSEPR theory?

Accepted Answer

A) Trigonal pyramidal 
B) Trigonal planar 
C) Angular 
D) Bent 
E) Linear 
A) Trigonal pyramidal 
B) Trigonal planar 
C) Angular 
D) Bent 
E) Linear

Question 15

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

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

Question 16

According to VSEPR theory, a molecule with the general formula AX5E will have a __________ molecular shape.

Accepted Answer

A) tetrahedral 
B) trigonal bipyramidal 
C) square pyramidal 
D) octahedral 
E) see-saw 
A) tetrahedral 
B) trigonal bipyramidal 
C) square pyramidal 
D) octahedral 
E) see-saw

Question 17

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

Accepted Answer

A) more than 120° 
B) exactly 120° 
C) between 109° and 120° 
D) between 90° and 109° 
E) less than 90° 
A) more than 120° 
B) exactly 120° 
C) between 109° and 120° 
D) between 90° and 109° 
E) less than 90°

Question 18

According to VSEPR theory, a molecule with the general formula AX3E will have a __________ molecular shape.

Accepted Answer

A) bent 
B) trigonal planar 
C) trigonal pyramidal 
D) tetrahedral 
E) triangular 
A) bent 
B) trigonal planar 
C) trigonal pyramidal 
D) tetrahedral 
E) triangular

Exam 10: The Shapes of Molecules

Select the correct Lewis structure for nitrogen trifluoride, NF3.

According to VSEPR theory, a molecule with the general formula AX2 will have a __________ molecular shape.

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl2.

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

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

In the hemoglobin molecule that carries oxygen molecules in blood, iron has 6 single bonds to surrounding atoms. What is the most likely geometry of these bonds to iron?

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Which of the following has no net dipole moment?

The best Lewis structure for sulfuric acid has zero formal charges, sulfur as the central atom, and no bonds between S and H. How many single and double bonds, respectively, are there in this Lewis structure?

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.

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

Select the Lewis structure in which formal charges are minimized for the periodate anion, IO4−.

What is the molecular shape of N2O as predicted by the VSEPR theory?

Which one of the following Lewis structures is definitely incorrect?

According to VSEPR theory, a molecule with the general formula AX5E will have a __________ molecular shape.

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

According to VSEPR theory, a molecule with the general formula AX3E will have a __________ molecular shape.

Keys to the Study of 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

Select the correct Lewis structure for nitrogen trifluoride, NF₃.

According to VSEPR theory, a molecule with the general formula AX₂will have a __________ molecular shape.

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl₂.

Hydrazine, N₂H₄, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Predict the actual bond angle in SeCl₂using the VSEPR theory.

According to VSEPR theory, a molecule with the general formula AX₂E₃will have a __________ molecular shape.

Select the Lewis structure in which formal charges are minimized for the periodate anion, IO₄⁻.

What is the molecular shape of N₂O as predicted by the VSEPR theory?

According to VSEPR theory, a molecule with the general formula AX₅E will have a __________ molecular shape.

Predict the smallest actual bond angle in BrF₃using the VSEPR theory.

According to VSEPR theory, a molecule with the general formula AX₃E will have a __________ molecular shape.