Question 1

Three possible structures of C2H2Cl2 are shown below.Which of these molecules are polar?

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  2 and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  2 and 3

Question 2

The nitrogen atom in cyanide ion,CN-,is surrounded by

Accepted Answer

A)  one single bond and three lone pairs of electrons. 
B)  one double bond and one lone pair of electrons. 
C)  one double bond and two lone pairs of electrons. 
D)  one triple bond and one lone pair of electrons. 
E)  one triple bond and no lone pairs of electrons. 
A)  one single bond and three lone pairs of electrons. 
B)  one double bond and one lone pair of electrons. 
C)  one double bond and two lone pairs of electrons. 
D)  one triple bond and one lone pair of electrons. 
E)  one triple bond and no lone pairs of electrons.

Question 3

What is the molecular geometry around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and four single bonds.

Accepted Answer

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

Question 4

Using bond-energy data,what is   is ∆S1U1B1rS1U1B0H for the following reaction?

Accepted Answer

A)  130 kJ/mol-rxn 
B)  -411 kJ/mol-rxn 
C)  -130 kJ/mol-rxn 
D)  1236 kJ/mol-rxn 
E)  411 kJ/mol-rxn 
A)  130 kJ/mol-rxn 
B)  -411 kJ/mol-rxn 
C)  -130 kJ/mol-rxn 
D)  1236 kJ/mol-rxn 
E)  411 kJ/mol-rxn

Question 5

Which of the following are possible Lewis structures for C2H6O?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  2 and 3 
E)  1,2,and 3 
A)  1 
B)  2 
C)  3 
D)  2 and 3 
E)  1,2,and 3

Question 6

Which of the following molecules or ions are likely to be free radicals: N2O,NO,and NO2?

Accepted Answer

A)  N2O only 
B)  NO only 
C)  NO2 only 
D)  N2O and NO 
E)  NO and NO2 
A)  N2O only 
B)  NO only 
C)  NO2 only 
D)  N2O and NO 
E)  NO and NO2

Question 7

What is the O-C-N bond angle in OCN-?

Accepted Answer

A)  90S1U1P1$\circ$S1S1P0 
B)  107S1U1P1$\circ$S1S1P0 
C)  109.5S1U1P1$\circ$S1S1P0 
D)  120S1U1P1$\circ$S1S1P0 
E)  180S1U1P1$\circ$S1S1P0 
A)  90S1U1P1$\circ$S1S1P0 
B)  107S1U1P1$\circ$S1S1P0 
C)  109.5S1U1P1$\circ$S1S1P0 
D)  120S1U1P1$\circ$S1S1P0 
E)  180S1U1P1$\circ$S1S1P0

Question 8

All of the following Lewis structures of nitrogen oxides are possible EXCEPT

Accepted Answer

A)  N2O. 
B)  N2O4. 
C)  N2O3. 
D)  N2O5. 
E)  All of the above are correct structures. 
A)  N2O. 
B)  N2O4. 
C)  N2O3. 
D)  N2O5. 
E)  All of the above are correct structures.

Question 9

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 10

Linus Pauling noticed that the energy of a polar bond is often greater than expected.He attributed the greater bond energy to

Accepted Answer

A)  a coulombic attraction between atoms with partially positive and negative charges. 
B)  the greater bond lengths of the heteronuclear bonds. 
C)  one of the many unexplainable phenomena that scientists encounter. 
D)  the ability of heteronuclear species to form double and triple bonds. 
E)  the greater number of valence electrons found in heteronuclear molecules. 
A)  a coulombic attraction between atoms with partially positive and negative charges. 
B)  the greater bond lengths of the heteronuclear bonds. 
C)  one of the many unexplainable phenomena that scientists encounter. 
D)  the ability of heteronuclear species to form double and triple bonds. 
E)  the greater number of valence electrons found in heteronuclear molecules.

Question 11

Use VSEPR theory to predict the molecular geometry of BrF5.

Accepted Answer

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

Question 12

Use Lewis structures to predict the bond order for a carbon-oxygen bond in CO2?

Accepted Answer

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

Question 13

In the Lewis structure of SF6,how many lone pairs are around the central atom?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 14

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,SO2.

Accepted Answer

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

Question 15

If a molecule has a positive and negative end,the molecule is said to have a(n)________ moment.

Accepted Answer

The answer of If a molecule has a positive and...

Question 16

Which of the following molecules is nonpolar?

Accepted Answer

A)  sulfur dioxide,SO2 
B)  phosphorus trifluoride,PF3 
C)  hydrogen fluoride,HF 
D)  phosphorus pentafluoride,PF5 
E)  nitrogen trifluoride,NF3 
A)  sulfur dioxide,SO2 
B)  phosphorus trifluoride,PF3 
C)  hydrogen fluoride,HF 
D)  phosphorus pentafluoride,PF5 
E)  nitrogen trifluoride,NF3

Question 17

What is the molecular geometry around oxygen atom O2?

Accepted Answer

A)  linear 
B)  trigonal pyramidal 
C)  trigonal planar 
D)  T-shaped 
E)  tetrahedral 
A)  linear 
B)  trigonal pyramidal 
C)  trigonal planar 
D)  T-shaped 
E)  tetrahedral

Question 18

The molecule H2S has

Accepted Answer

A)  2 bonding pairs and 3 lone pairs 
B)  2 bonding pairs and 2 lone pairs 
C)  3 bonding pairs and 1 lone pair 
D)  3 bonding pairs and 3 lone pairs 
E)  none of these 
A)  2 bonding pairs and 3 lone pairs 
B)  2 bonding pairs and 2 lone pairs 
C)  3 bonding pairs and 1 lone pair 
D)  3 bonding pairs and 3 lone pairs 
E)  none of these

Question 19

Which of the following bonds would be the most polar?

Accepted Answer

A)  N-N 
B)  N-P 
C)  N-C 
D)  N-As 
E)  N-Ge 
A)  N-N 
B)  N-P 
C)  N-C 
D)  N-As 
E)  N-Ge

Question 20

Which of the following species has the shortest carbon-nitrogen bond?

Accepted Answer

A)  CH3CN 
B)  CH3N2 
C)  CH2NH 
D)  CH3CONH2 
E)  NO3- 
A)  CH3CN 
B)  CH3N2 
C)  CH2NH 
D)  CH3CONH2 
E)  NO3-

Exam 9: Bonding and Molecular Structure

Three possible structures of C2H2Cl2 are shown below.Which of these molecules are polar?

The nitrogen atom in cyanide ion,CN-,is surrounded by

What is the molecular geometry around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and four single bonds.

Using bond-energy data,what is is ∆rH for the following reaction?

Which of the following are possible Lewis structures for C2H6O?

Which of the following molecules or ions are likely to be free radicals: N2O,NO,and NO2?

What is the O-C-N bond angle in OCN-?

All of the following Lewis structures of nitrogen oxides are possible EXCEPT

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

Linus Pauling noticed that the energy of a polar bond is often greater than expected.He attributed the greater bond energy to

Use VSEPR theory to predict the molecular geometry of BrF5.

Use Lewis structures to predict the bond order for a carbon-oxygen bond in CO2?

In the Lewis structure of SF6,how many lone pairs are around the central atom?

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,SO2.

If a molecule has a positive and negative end,the molecule is said to have a(n)________ moment.

Which of the following molecules is nonpolar?

What is the molecular geometry around oxygen atom O2?

The molecule H2S has

Which of the following bonds would be the most polar?

Which of the following species has the shortest carbon-nitrogen bond?

Basic Concepts of Chemistry

Mathlets 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 Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of 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

Three possible structures of C₂H₂Cl₂ are shown below.Which of these molecules are polar?

The nitrogen atom in cyanide ion,CN^-,is surrounded by

Using bond-energy data,what is is ∆_rH for the following reaction?

Which of the following are possible Lewis structures for C₂H₆O?

Which of the following molecules or ions are likely to be free radicals: N₂O,NO,and NO₂?

What is the O-C-N bond angle in OCN^-?

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

Use VSEPR theory to predict the molecular geometry of BrF₅.

Use Lewis structures to predict the bond order for a carbon-oxygen bond in CO₂?

In the Lewis structure of SF₆,how many lone pairs are around the central atom?

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,SO₂.

What is the molecular geometry around oxygen atom O₂?

The molecule H₂S has