Question 1

Select the best Lewis structure for P2I4.

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) None of these structures is suitable for P2I4. 
A) a 
B) b 
C) c 
D) d 
E) None of these structures is suitable for P2I4. A

Question 2

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

Accepted Answer

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

Question 3

What is the molecular shape of the thiocyanate anion,SCN-,as predicted by the VSEPR theory? (Carbon is the central atom. )

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. A

Question 4

Select the correct Lewis structure for nitrogen trifluoride,NF3.

Accepted Answer

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

Question 5

According to VSEPR theory,a molecule with the general formula AX4E will have a _____ molecular shape.

Accepted Answer

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

Question 6

According to VSEPR theory,a molecule with the general formula AX6 will have a ______ molecular shape.

Accepted Answer

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

Question 7

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

Accepted Answer

A) SO3 
B) BF3 
C) I3- 
D) SCO (C = central atom) 
E) SO32- 
A) SO3 
B) BF3 
C) I3- 
D) SCO (C = central atom) 
E) SO32-

Question 8

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory.
(N is the central atom. )

Accepted Answer

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

Question 9

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 10

Which of the following atoms can expand its valence shell when bonding?

Accepted Answer

A) N 
B) C 
C) O 
D) P 
E) Al 
A) N 
B) C 
C) O 
D) P 
E) Al

Question 11

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

Accepted Answer

A) BF4- 
B) XeO3 
C) SiCl4 
D) NH3 
E) CH2Cl2 
A) BF4- 
B) XeO3 
C) SiCl4 
D) NH3 
E) CH2Cl2

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) None of these structures is suitable for SOCl2. 
A) a 
B) b 
C) c 
D) d 
E) None of these structures is suitable for SOCl2.

Question 14

Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold.
a.NH3
 b.O3 (Hint: O3 is not cyclic)
c.HCN
d.SO3

Accepted Answer

Question 15

According to VSEPR theory,a molecule with the general formula AX3 will have a ______ molecular shape.

Accepted Answer

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

Question 16

Explain what is meant by "dipole moment",and give an example of a molecule which has polar bonds but which does not itself have a dipole moment.

Accepted Answer

A dipole moment arises in a molecule whe

Question 17

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 18

Predict the ideal bond angles in IF2- using the molecular shape given by the VSEPR theory.

Accepted Answer

A) 60° 
B) 90° 
C) 109° 
D) 120° 
E) 180° 
A) 60° 
B) 90° 
C) 109° 
D) 120° 
E) 180°

Question 19

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 20

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.

Exam 10: The Shapes of Molecules

Select the best Lewis structure for P2I4.

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

What is the molecular shape of the thiocyanate anion,SCN-,as predicted by the VSEPR theory? (Carbon is the central atom. )

Select the correct Lewis structure for nitrogen trifluoride,NF3.

According to VSEPR theory,a molecule with the general formula AX4E will have a _____ molecular shape.

According to VSEPR theory,a molecule with the general formula AX6 will have a ______ molecular shape.

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

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (N is the central atom. )

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

Which of the following atoms can expand its valence shell when bonding?

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

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

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

Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold. a.NH3 b.O3 (Hint: O3 is not cyclic) c.HCN d.SO3

According to VSEPR theory,a molecule with the general formula AX3 will have a ______ molecular shape.

Explain what is meant by "dipole moment",and give an example of a molecule which has polar bonds but which does not itself have a dipole moment.

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

Predict the ideal bond angles in IF2- using the molecular shape given by 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

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

Select the best Lewis structure for P₂I₄.

What is the molecular shape of the thiocyanate anion,SCN^-,as predicted by the VSEPR theory? (Carbon is the central atom. )

Select the correct Lewis structure for nitrogen trifluoride,NF₃.

According to VSEPR theory,a molecule with the general formula AX₄E will have a _____ molecular shape.

According to VSEPR theory,a molecule with the general formula AX₆ will have a ______ molecular shape.

Predict the ideal bond angles around nitrogen in N₂F₂ using the molecular shape given by the VSEPR theory. (N is the central atom. )

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

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

Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold. a.NH₃ b.O₃ (Hint: O₃ is not cyclic) c.HCN d.SO₃

According to VSEPR theory,a molecule with the general formula AX₃ will have a ______ molecular shape.

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

Predict the ideal bond angles in IF₂^- using the molecular shape given by the VSEPR theory.

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