Question 1

When both of the electrons in a molecular bond originate from the same atom,the bond is called a(n)

Accepted Answer

A)  sigma bond. 
B)  coordinate covalent bond. 
C)  pi bond. 
D)  metallic bond. 
E)  ionic bond. 
A)  sigma bond. 
B)  coordinate covalent bond. 
C)  pi bond. 
D)  metallic bond. 
E)  ionic bond. B

Question 2

According to VSEPR theory,which of the following is the correct molecular geometry around the carbon atom in formaldehyde?

Accepted Answer

A)  Linear 
B)  Bent 
C)  Trigonal-planar 
D)  Tetrahedral 
E)  Octahedral 
A)  Linear 
B)  Bent 
C)  Trigonal-planar 
D)  Tetrahedral 
E)  Octahedral C

Question 3

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl3.

Accepted Answer

A)  The electron-pair geometry is linear,the molecular geometry is linear. 
B)  The electron-pair geometry is trigonal-planar,the molecular geometry is trigonal-planar. 
C)  The electron-pair geometry is trigonal-planar,the molecular geometry is bent. 
D)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
E)  The electron-pair geometry is tetrahedral,the molecular geometry is trigonal-pyramidal. 
A)  The electron-pair geometry is linear,the molecular geometry is linear. 
B)  The electron-pair geometry is trigonal-planar,the molecular geometry is trigonal-planar. 
C)  The electron-pair geometry is trigonal-planar,the molecular geometry is bent. 
D)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
E)  The electron-pair geometry is tetrahedral,the molecular geometry is trigonal-pyramidal. E

Question 4

Based on electron-pair geometries,which of the following molecules has the smallest bond angle between any two adjacent atoms?

Accepted Answer

A)  CH4 
B)  H2O 
C)  BH3 
D)  PH3 
E)  SF6 
A)  CH4 
B)  H2O 
C)  BH3 
D)  PH3 
E)  SF6

Question 5

The central atom in SF6 is surrounded by

Accepted Answer

A)  six single bonds and no lone pairs of electrons. 
B)  six single bonds and one lone pair of electrons. 
C)  six single bonds and two lone pairs of electrons. 
D)  five single bonds,one double bond,and one lone pair of electrons. 
E)  four single bonds,two double bonds,and no lone pairs of electrons. 
A)  six single bonds and no lone pairs of electrons. 
B)  six single bonds and one lone pair of electrons. 
C)  six single bonds and two lone pairs of electrons. 
D)  five single bonds,one double bond,and one lone pair of electrons. 
E)  four single bonds,two double bonds,and no lone pairs of electrons.

Question 6

Which of the following molecules or ions are isoelectronic: SO3,NF3,NO3-,CO32-?

Accepted Answer

A)  SO3 and NF3 
B)  NF3 and CO32- 
C)  SO3,NF3 and CO32- 
D)  SO3,NO3- and CO32- 
E)  SO3,NF3,NO3-,and CO32- 
A)  SO3 and NF3 
B)  NF3 and CO32- 
C)  SO3,NF3 and CO32- 
D)  SO3,NO3- and CO32- 
E)  SO3,NF3,NO3-,and CO32-

Question 7

Which of the following molecules is nonpolar?

Accepted Answer

A)  sulfur dioxide,SO2 
B)  hydrogen fluoride,HF 
C)  phosphorus trifluoride,PF3 
D)  boron trifluoride,BF3 
E)  iodine trichloride,ICl3 
A)  sulfur dioxide,SO2 
B)  hydrogen fluoride,HF 
C)  phosphorus trifluoride,PF3 
D)  boron trifluoride,BF3 
E)  iodine trichloride,ICl3

Question 8

Choose which central atom in the following molecules is most electronegative.

Accepted Answer

A)  PH3 
B)  CH4 
C)  H2S 
D)  H2O 
E)  NH3 
A)  PH3 
B)  CH4 
C)  H2S 
D)  H2O 
E)  NH3

Question 9

In molecules,as bond order increases,

Accepted Answer

A)  both bond length and bond energy increase. 
B)  both bond length and bond energy decrease. 
C)  bond length increases and bond energy is unchanged. 
D)  bond length is unchanged and bond energy increases. 
E)  bond length decreases and bond energy increases. 
A)  both bond length and bond energy increase. 
B)  both bond length and bond energy decrease. 
C)  bond length increases and bond energy is unchanged. 
D)  bond length is unchanged and bond energy increases. 
E)  bond length decreases and bond energy increases.

Question 10

Which is the best Lewis structure of CH2FCO2H (connectivity correct as given)?

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of these is acceptable 
A)    
B)    
C)    
D)    
E)  none of these is acceptable

Question 11

Which of the following is the correct Lewis dash formula for carbon diselenide?

Accepted Answer

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

Question 12

The correct Lewis structure for Cl2CO is (the 2 Cl's and the O are bound to the C and not to each other):

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of these 
A)    
B)    
C)    
D)    
E)  none of these

Question 13

Which of the following elements is able to form a molecular structure that exceeds the octet rule?

Accepted Answer

A)  C 
B)  N 
C)  O 
D)  F 
E)  Cl 
A)  C 
B)  N 
C)  O 
D)  F 
E)  Cl

Question 14

Which of the following groups of molecules contains no ionic compounds?

Accepted Answer

A)  HCN,NO2,and Ca(NO3)2 
B)  PCl5,LiBr,and Zn(OH)2 
C)  KOH,CCl4,and SF4 
D)  NaH,CaF2,and NaNH2 
E)  CH2O,H2S,and NH3 
A)  HCN,NO2,and Ca(NO3)2 
B)  PCl5,LiBr,and Zn(OH)2 
C)  KOH,CCl4,and SF4 
D)  NaH,CaF2,and NaNH2 
E)  CH2O,H2S,and NH3

Question 15

What is the formal charge of the oxygen atom in the Lewis structure for cyanate shown below?

Accepted Answer

A)  0 
B)  −2 
C)  +1 
D)  −1 
E)  2 
A)  0 
B)  −2 
C)  +1 
D)  −1 
E)  2

Question 16

Which of the following bonds would be the most polar?

Accepted Answer

A)  N--C 
B)  N--Si 
C)  N--P 
D)  N--Al 
E)  N--Ga 
A)  N--C 
B)  N--Si 
C)  N--P 
D)  N--Al 
E)  N--Ga

Question 17

What is the bond angle in a trigonal planar molecule or ion?

Accepted Answer

A)  109° 
B)  180° 
C)  90° 
D)  72° 
E)  120° 
A)  109° 
B)  180° 
C)  90° 
D)  72° 
E)  120°

Question 18

Which of the following is the Lewis electron dot structure for carbon monoxide?

Accepted Answer

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

Question 19

What are the approximate H−N−H bond angles in NH4+?

Accepted Answer

A)  109.5° 
B)  120° 
C)  109.5° and 120° 
D)  90° 
E)  90° and 120° 
A)  109.5° 
B)  120° 
C)  109.5° and 120° 
D)  90° 
E)  90° and 120°

Question 20

Which of the following molecules or ions will have a Lewis structure most like that of phosphorus trichloride,PCl3?

Accepted Answer

A)  ClO3- 
B)  SO3 
C)  CO32- 
D)  BF3 
E)  Cl2CO 
A)  ClO3- 
B)  SO3 
C)  CO32- 
D)  BF3 
E)  Cl2CO

Exam 9: Bonding and Molecular Structure

When both of the electrons in a molecular bond originate from the same atom,the bond is called a(n)

According to VSEPR theory,which of the following is the correct molecular geometry around the carbon atom in formaldehyde?

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl3.

Based on electron-pair geometries,which of the following molecules has the smallest bond angle between any two adjacent atoms?

The central atom in SF6 is surrounded by

Which of the following molecules or ions are isoelectronic: SO3,NF3,NO3-,CO32-?

Which of the following molecules is nonpolar?

Choose which central atom in the following molecules is most electronegative.

In molecules,as bond order increases,

Which is the best Lewis structure of CH2FCO2H (connectivity correct as given)?

Which of the following is the correct Lewis dash formula for carbon diselenide?

The correct Lewis structure for Cl2CO is (the 2 Cl's and the O are bound to the C and not to each other):

Which of the following elements is able to form a molecular structure that exceeds the octet rule?

Which of the following groups of molecules contains no ionic compounds?

What is the formal charge of the oxygen atom in the Lewis structure for cyanate shown below?

Which of the following bonds would be the most polar?

What is the bond angle in a trigonal planar molecule or ion?

Which of the following is the Lewis electron dot structure for carbon monoxide?

What are the approximate H−N−H bond angles in NH4+?

Which of the following molecules or ions will have a Lewis structure most like that of phosphorus trichloride,PCl3?

Basic Concepts of Chemistry

Lets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of nitrogen trichloride,NCl₃.

The central atom in SF₆ is surrounded by

Which of the following molecules or ions are isoelectronic: SO₃,NF₃,NO₃^-,CO₃^2-?

Which is the best Lewis structure of CH₂FCO₂H (connectivity correct as given)?

The correct Lewis structure for Cl₂CO is (the 2 Cl's and the O are bound to the C and not to each other):

What are the approximate H−N−H bond angles in NH₄⁺?

Which of the following molecules or ions will have a Lewis structure most like that of phosphorus trichloride,PCl₃?