Question 1

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

Accepted Answer

A) SO 2 
B) HCl 
C) CS 2 
D) CO 
E) Cl 2O 
A) SO 2 
B) HCl 
C) CS 2 
D) CO 
E) Cl 2O C

Question 2

Phosphoryl iodide is used in the preparation of organophosphorus derivatives and phosphate esters. Select the Lewis structure for POI3 that minimizes formal charges.

Accepted Answer

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

Question 3

In the following Lewis structure for ClO3F, chlorine has a formal charge of __________ and an oxidation number of __________.

Accepted Answer

A) 7; 7 
B) 7; −1 
C) 1; 1 
D) 1; −1 
E) 1; 7 
A) 7; 7 
B) 7; −1 
C) 1; 1 
D) 1; −1 
E) 1; 7 E

Question 4

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

Accepted Answer

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

Question 5

The Lewis structure of NO2 violates the octet rule.

Accepted Answer

A) True 
 B)False

Question 6

All possible resonance structures contribute equally to the resonance hybrid.

Accepted Answer

A) True 
 B)False

Question 7

Boron never achieves an octet in any of its compounds.

Accepted Answer

A) True 
 B)False

Question 8

Select the best Lewis structure for P2I4.

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 9

Which one of the following molecules contains a double bond?

Accepted Answer

A) N 2 
B) PCl 5 
C) CH 2O 
D) C 2H 2 
E) I 2 
A) N 2 
B) PCl 5 
C) CH 2O 
D) C 2H 2 
E) I 2

Question 10

Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory.

Accepted Answer

A) 90° 
B) 109° 
C) 120° 
D) 180° 
E) < 90° 
A) 90° 
B) 109° 
C) 120° 
D) 180° 
E) < 90°

Question 11

When resonance occurs, the bond lengths in a molecule fluctuate rapidly.

Accepted Answer

A) True 
 B)False

Question 12

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 13

Which of the following molecules has a net dipole moment?

Accepted Answer

A) BeCl 2 
B) SF 2 
C) KrF 2 
D) CO 2 
E) CCl 4 
A) BeCl 2 
B) SF 2 
C) KrF 2 
D) CO 2 
E) CCl 4

Question 14

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 15

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) NH 3 
B) NH 4 + 
C) I 2 
D) BH 4 − 
E) SF 6 
A) NH 3 
B) NH 4 + 
C) I 2 
D) BH 4 − 
E) SF 6

Question 16

Which one of the following molecules does not have a dipole moment?

Accepted Answer

A) CS 2 
B) H 2S 
C) CH 2Cl 2 
D) PH 3 
E) CH 2O 
A) CS 2 
B) H 2S 
C) CH 2Cl 2 
D) PH 3 
E) CH 2O

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

How many resonance structures are possible for NO3−?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 19

In the following Lewis structure for phosphate, phosphorus has a formal charge of __________ and an oxidation number of __________.

Accepted Answer

A) 0; −3 
B) 0; 5 
C) 5; −3 
D) 5; 5 
E) 3; 5 
A) 0; −3 
B) 0; 5 
C) 5; −3 
D) 5; 5 
E) 3; 5

Question 20

In order for a noncyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

Accepted Answer

A) True 
 B)False

Exam 10: The Shapes of Molecules

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

Phosphoryl iodide is used in the preparation of organophosphorus derivatives and phosphate esters. Select the Lewis structure for POI3 that minimizes formal charges.

In the following Lewis structure for ClO3F, chlorine has a formal charge of __________ and an oxidation number of __________.

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

The Lewis structure of NO2 violates the octet rule.

All possible resonance structures contribute equally to the resonance hybrid.

Boron never achieves an octet in any of its compounds.

Select the best Lewis structure for P2I4.

Which one of the following molecules contains a double bond?

Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory.

When resonance occurs, the bond lengths in a molecule fluctuate rapidly.

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

Which of the following molecules has a net dipole moment?

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

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

Which one of the following molecules does not have a dipole moment?

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

How many resonance structures are possible for NO3−?

In the following Lewis structure for phosphate, phosphorus has a formal charge of __________ and an oxidation number of __________.

In order for a noncyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

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

Phosphoryl iodide is used in the preparation of organophosphorus derivatives and phosphate esters. Select the Lewis structure for POI₃ that minimizes formal charges.

In the following Lewis structure for ClO₃F, chlorine has a formal charge of and an oxidation number of .

Select the Lewis structure for XeO₂F₂that correctly minimizes formal charges.

The Lewis structure of NO₂ violates the octet rule.

Select the best Lewis structure for P₂I₄.

Predict the ideal bond angles in GeCl₄using the molecular shape given by the VSEPR theory.

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

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

How many resonance structures are possible for NO₃⁻?

In the following Lewis structure for phosphate, phosphorus has a formal charge of and an oxidation number of .