Question 1

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

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 2

What is the formal charge on atom N in the following Lewis structure?

Accepted Answer

A)  2 
B)  1 
C)  0 
D)  -1 
E)  -2 
A)  2 
B)  1 
C)  0 
D)  -1 
E)  -2

Question 3

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,XeF4.

Accepted Answer

A)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
B)  The electron-pair geometry is octahedral,the molecular geometry is tetrahedral. 
C)  The electron-pair geometry is tetrahedral,the molecular geometry is octahedral. 
D)  The electron-pair geometry is octahedral,the molecular geometry is square-planar. 
E)  The electron-pair geometry is square-planar,the molecular geometry is tetrahedral. 
A)  The electron-pair geometry is tetrahedral,the molecular geometry is tetrahedral. 
B)  The electron-pair geometry is octahedral,the molecular geometry is tetrahedral. 
C)  The electron-pair geometry is tetrahedral,the molecular geometry is octahedral. 
D)  The electron-pair geometry is octahedral,the molecular geometry is square-planar. 
E)  The electron-pair geometry is square-planar,the molecular geometry is tetrahedral.

Question 4

Which of the following statements is/are CORRECT?
1)Chemical reactions result in the gain,loss,or rearrangement of valence electrons.
2)For main group elements,the number of valence electrons equals eight minus the element's group number.
3)Core electrons are not involved in bonding or in chemical reactions.

Accepted Answer

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

Question 5

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 6

The central atom in N2O is a nitrogen atom.This nitrogen atom is surrounded by

Accepted Answer

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

Question 7

Which one of the following molecules is polar?

Accepted Answer

A)  CS2 
B)  SO2 
C)  XeF2 
D)  XeF4 
E)  SO3 
A)  CS2 
B)  SO2 
C)  XeF2 
D)  XeF4 
E)  SO3

Question 8

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 9

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 10

In the Lewis formula for sulfur dioxide,SO2,the number of lone pairs of electrons around the sulfur atom is

Accepted Answer

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

Question 11

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

Accepted Answer

A)  trigonal bipyramidal 
B)  see-saw or distorted tetrahedron 
C)  T-shaped 
D)  linear 
E)  trigonal planar 
A)  trigonal bipyramidal 
B)  see-saw or distorted tetrahedron 
C)  T-shaped 
D)  linear 
E)  trigonal planar

Question 12

Based on the following data,what is the Cl-Cl bond energy?

Accepted Answer

A)  432 kJ/mol 
B)  236 kJ/mol 
C)  -236 kJ/mol 
D)  -421 kJ/mol 
E)  421 kJ/mol 
A)  432 kJ/mol 
B)  236 kJ/mol 
C)  -236 kJ/mol 
D)  -421 kJ/mol 
E)  421 kJ/mol

Question 13

Atoms having equal or nearly equal electronegativities are expected to form

Accepted Answer

A)  no bonds 
B)  polar covalent bonds 
C)  nonpolar covalent bonds 
D)  ionic bonds 
E)  covalent bonds 
A)  no bonds 
B)  polar covalent bonds 
C)  nonpolar covalent bonds 
D)  ionic bonds 
E)  covalent bonds

Question 14

Which of the following are resonance structures for formate ion,HCO2-?

Accepted Answer

A)  1 and 2 
B)  2 and 3 
C)  3 and 4 
D)  1,3,and 4 
E)  2,3,and 4 
A)  1 and 2 
B)  2 and 3 
C)  3 and 4 
D)  1,3,and 4 
E)  2,3,and 4

Question 15

What is the formal charge on carbon in CH2Cl2?

Accepted Answer

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

Question 16

Which of the following compounds has polar covalent bonds: CCl4,Cl2,HCl,and KCl?

Accepted Answer

A)  CCl4 only 
B)  Cl2 only 
C)  HCl and KCl 
D)  Cl2 and KCl 
E)  CCl4 and HCl 
A)  CCl4 only 
B)  Cl2 only 
C)  HCl and KCl 
D)  Cl2 and KCl 
E)  CCl4 and HCl

Question 17

How many different molecules have the molecular formula C6H14?

Accepted Answer

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

Question 18

One might expect PCl3 to have a trigonal planar molecular geometry since its central atom is surrounded by three outer atoms.However,PCl3 has a trigonal pyramidal geometry.Explain.

Accepted Answer

The shape of a molecule is dependent upo

Question 19

What is the molecular geometry around carbon atom C3?

Accepted Answer

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

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

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

What is the formal charge on atom N in the following Lewis structure?

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,XeF4.

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

The central atom in N2O is a nitrogen atom.This nitrogen atom is surrounded by

Which one of the following molecules is polar?

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

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

In the Lewis formula for sulfur dioxide,SO2,the number of lone pairs of electrons around the sulfur atom is

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

Based on the following data,what is the Cl-Cl bond energy?

Atoms having equal or nearly equal electronegativities are expected to form

Which of the following are resonance structures for formate ion,HCO2-?

What is the formal charge on carbon in CH2Cl2?

Which of the following compounds has polar covalent bonds: CCl4,Cl2,HCl,and KCl?

How many different molecules have the molecular formula C6H14?

One might expect PCl3 to have a trigonal planar molecular geometry since its central atom is surrounded by three outer atoms.However,PCl3 has a trigonal pyramidal geometry.Explain.

What is the molecular geometry around carbon atom C3?

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

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

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of sulfur dioxide,XeF₄.

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

The central atom in N₂O is a nitrogen atom.This nitrogen atom is surrounded by

In the Lewis formula for sulfur dioxide,SO₂,the number of lone pairs of electrons around the sulfur atom is

Which of the following are resonance structures for formate ion,HCO₂^-?

What is the formal charge on carbon in CH₂Cl₂?

Which of the following compounds has polar covalent bonds: CCl₄,Cl₂,HCl,and KCl?

How many different molecules have the molecular formula C₆H₁₄?

One might expect PCl₃ to have a trigonal planar molecular geometry since its central atom is surrounded by three outer atoms.However,PCl₃ has a trigonal pyramidal geometry.Explain.

What is the molecular geometry around carbon atom C₃?

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