Question 1

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

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

Question 2

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

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

Question 3

Name and outline the concept which is introduced when more than one valid Lewis structure can be drawn for a given molecule or ion.Use appropriate diagrams of the formate ion (HCO2-,carbon is the central atom)to illustrate.

Accepted Answer

The concept is resonance.In this situati

Question 4

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

Accepted Answer

A) CS2 
B) H2S 
C) CH2Cl2 
D) PH3 
E) CH2O 
A) CS2 
B) H2S 
C) CH2Cl2 
D) PH3 
E) CH2O

Question 5

What is the molecular shape of XeO2F2 as predicted by the VSEPR theory?

Accepted Answer

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

Question 6

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry.(The central atom is always first in the formula. )

Accepted Answer

A) PCl3 
B) BF3 
C) SO3 
D) BrF3 
E) CO32- 
A) PCl3 
B) BF3 
C) SO3 
D) BrF3 
E) CO32-

Question 7

According to VSEPR theory,a molecule with the general formula AX3E2 will have a _____ molecular shape.

Accepted Answer

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

Question 8

Predict the actual bond angles 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 9

In order for a non-cyclic 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

Question 10

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

Accepted Answer

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

Question 11

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

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

Question 12

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

Question 13

In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)

Accepted Answer

A) CO2 
B) ClO3- 
C) COCl2 
D) NO2+ 
E) HCN 
A) CO2 
B) ClO3- 
C) COCl2 
D) NO2+ 
E) HCN

Question 14

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 15

Predict the ideal bond angles in AsCl3 using the molecular shape given by the VSEPR theory.

Accepted Answer

A) 90° 
B) 109° 
C) 120° 
D) 180° 
E) between 110 and 120° 
A) 90° 
B) 109° 
C) 120° 
D) 180° 
E) between 110 and 120°

Question 16

What is the molecular shape of ClF4- as predicted by the VSEPR theory?

Accepted Answer

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

Question 17

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 18

According to VSEPR theory,a molecule with the general formula AX2E will have a ______ molecular shape.

Accepted Answer

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

Question 19

For the chlorate ion,ClO3-,draw two different valid Lewis structures,as follows:
a.a structure in which the octet rule is obeyed
b.a structure in which formal charges are minimized

Accepted Answer

Question 20

Draw Lewis structures,showing all valence electrons,for the following species:
a.S2-
 b.CO
c.SO2
 d.CH3OH

Accepted Answer

Exam 10: The Shapes of Molecules

Which one of the following Lewis structures is definitely incorrect?

Which one of the following Lewis structures is definitely incorrect?

Name and outline the concept which is introduced when more than one valid Lewis structure can be drawn for a given molecule or ion.Use appropriate diagrams of the formate ion (HCO2-,carbon is the central atom)to illustrate.

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

What is the molecular shape of XeO2F2 as predicted by the VSEPR theory?

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry.(The central atom is always first in the formula. )

According to VSEPR theory,a molecule with the general formula AX3E2 will have a _____ molecular shape.

Predict the actual bond angles in BrF3 using the VSEPR theory.

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

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

Which one of the following Lewis structures is definitely incorrect?

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

In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)

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

Predict the ideal bond angles in AsCl3 using the molecular shape given by the VSEPR theory.

What is the molecular shape of ClF4- as predicted by the VSEPR theory?

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 AX2E will have a ______ molecular shape.

For the chlorate ion,ClO3-,draw two different valid Lewis structures,as follows: a.a structure in which the octet rule is obeyed b.a structure in which formal charges are minimized

Draw Lewis structures,showing all valence electrons,for the following species: a.S2- b.CO c.SO2 d.CH3OH

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

Name and outline the concept which is introduced when more than one valid Lewis structure can be drawn for a given molecule or ion.Use appropriate diagrams of the formate ion (HCO₂^-,carbon is the central atom)to illustrate.

What is the molecular shape of XeO₂F₂ as predicted by the VSEPR theory?

According to VSEPR theory,a molecule with the general formula AX₃E₂ will have a _____ molecular shape.

Predict the actual bond angles in BrF₃ using the VSEPR theory.

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

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

Predict the ideal bond angles in AsCl₃ using the molecular shape given by the VSEPR theory.

What is the molecular shape of ClF₄^- as predicted by the VSEPR theory?

According to VSEPR theory,a molecule with the general formula AX₂E will have a ______ molecular shape.

For the chlorate ion,ClO₃^-,draw two different valid Lewis structures,as follows: a.a structure in which the octet rule is obeyed b.a structure in which formal charges are minimized

Draw Lewis structures,showing all valence electrons,for the following species: a.S^2- b.CO c.SO₂ d.CH₃OH