Question 1

Draw all important resonance structures of the nitrate ion,NO3-

Accepted Answer

Question 2

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

Question 3

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-oxygen

Question 4

a.Draw and name three molecular shapes for molecules having the VSEPR formulas AX3,AX3E and AX3E2,respectively.
b.If the three X groups in the above formulas are identical,which of the three shapes would result in a molecule with a dipole moment?

Accepted Answer

(a)The three structures and th

Question 5

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 6

According to VSEPR theory,a molecule with the general formula AX4 will have a ______ molecular shape.

Accepted Answer

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

Question 7

What is the molecular shape of ClF2- as predicted by the VSEPR theory?

Accepted Answer

A) linear 
B) bent 
C) see-saw 
D) T-shaped 
E) L-shaped 
A) linear 
B) bent 
C) see-saw 
D) T-shaped 
E) L-shaped

Question 8

According to VSEPR theory,a molecule with the general formula AX5 will have a ______ molecular shape.

Accepted Answer

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

Question 9

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

Question 10

In which of the following does the nitrogen atom have a formal charge of -1?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 11

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 12

All possible resonance structures contribute equally to the resonance hybrid.

Accepted Answer

A) True 
 B)False

Question 13

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 14

Draw Lewis structures,showing all valence electrons,for:
a.N
b.Br-
 c.O2
 d.SO42-

Accepted Answer

Question 15

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 16

Predict the actual bond angles in SF3+ 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 17

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

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 18

The Lewis structure of NO2 violates the octet rule.

Accepted Answer

A) True 
 B)False

Question 19

Draw the Lewis structure of XeF4.Use this structure,in conjunction with VSEPR theory,to predict the shape of this molecule.Outline your reasoning.

Accepted Answer

The Lewis structure is shown alongside.T

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 10: The Shapes of Molecules

Draw all important resonance structures of the nitrate ion,NO3-

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

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.

a.Draw and name three molecular shapes for molecules having the VSEPR formulas AX3,AX3E and AX3E2,respectively. b.If the three X groups in the above formulas are identical,which of the three shapes would result in a molecule with a dipole moment?

Which of the following has no net dipole moment?

According to VSEPR theory,a molecule with the general formula AX4 will have a ______ molecular shape.

What is the molecular shape of ClF2- as predicted by the VSEPR theory?

According to VSEPR theory,a molecule with the general formula AX5 will have a ______ molecular shape.

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

In which of the following does the nitrogen atom have a formal charge of -1?

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

All possible resonance structures contribute equally to the resonance hybrid.

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

Draw Lewis structures,showing all valence electrons,for: a.N b.Br- c.O2 d.SO42-

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 actual bond angles in SF3+ using the VSEPR theory.

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

The Lewis structure of NO2 violates the octet rule.

Draw the Lewis structure of XeF4.Use this structure,in conjunction with VSEPR theory,to predict the shape of this molecule.Outline your reasoning.

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

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Draw all important resonance structures of the nitrate ion,NO₃^-

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

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.

a.Draw and name three molecular shapes for molecules having the VSEPR formulas AX₃,AX₃E and AX₃E₂,respectively. b.If the three X groups in the above formulas are identical,which of the three shapes would result in a molecule with a dipole moment?

According to VSEPR theory,a molecule with the general formula AX₄ will have a ______ molecular shape.

What is the molecular shape of ClF₂^- as predicted by the VSEPR theory?

According to VSEPR theory,a molecule with the general formula AX₅ will have a ______ molecular shape.

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

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

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

Draw Lewis structures,showing all valence electrons,for: a.N b.Br^- c.O₂ d.SO₄^2-

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

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

The Lewis structure of NO₂ violates the octet rule.

Draw the Lewis structure of XeF₄.Use this structure,in conjunction with VSEPR theory,to predict the shape of this molecule.Outline your reasoning.

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