Question 1

The central atom in _ _ does not violate the octet rule.

Accepted Answer

A)  SF4  
B)  CF4  
C)  KrF2  
D)  XeF4  
E)  ICl4- 
A)  SF4  
B)  CF4  
C)  KrF2  
D)  XeF4  
E)  ICl4-

Question 2

Calculate the bond energy of C- F given that the heat of atomization of CHFClBr is 1502 kJ/mol, and that the bond energies of C- H, C- Br, and C- Cl are 413, 276, and 328 kJ/mol, respectively.

Accepted Answer

OH_atomization= [D(C- H) + D(C- F) + D(C-

Question 3

For the questions that follow, consider the BEST Lewis structures of the following ox_yanions:  
-There can be four equivalent best resonance structures of .

Accepted Answer

A)  (i) 
B)  (ii) 
C)  (iii) 
D)  (iv) 
E)  (v) 
A)  (i) 
B)  (ii) 
C)  (iii) 
D)  (iv) 
E)  (v)

Question 4

The electron configuration of the S2- ion is .

Accepted Answer

A)  [Ne]3s23p6 
B)  [Ar]3s23p2 
C)  [Ar]3s23p6 
D)  [Ne]3s23p2 
E)  [Kr]3s22p- 6 
A)  [Ne]3s23p6 
B)  [Ar]3s23p2 
C)  [Ar]3s23p6 
D)  [Ne]3s23p2 
E)  [Kr]3s22p- 6

Question 5

What is the maximum number of double bonds that a carbon atom can form?

Accepted Answer

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

Question 6

For a given arrangement of ions, the lattice energy increases as ionic radius and as ionic charge .

Accepted Answer

A)  decreases, increases 
B)  decreases, decreases 
C)  increases, decreases 
D)  increases, increases 
E)  This cannot be predicted. 
A)  decreases, increases 
B)  decreases, decreases 
C)  increases, decreases 
D)  increases, increases 
E)  This cannot be predicted.

Question 7

How many single covalent bonds must a silicon atom form to have a complete octet in its valence shell?

Accepted Answer

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

Question 8

The central atom in _ violates the octet rule.

Accepted Answer

A)  NH3  
B)  AsF3  
C)  BF3  
D)  SeF2  
E)  CF4 
A)  NH3  
B)  AsF3  
C)  BF3  
D)  SeF2  
E)  CF4

Question 9

What is the electron configuration for the Co2+ ion?

Accepted Answer

A)  [Ar]4s23d9 
B)  [Ar]4s03d7 
C)  [Ar]4s13d6 
D)  [Ne]3s23p10 
E)  [Ar]4s03d5 
A)  [Ar]4s23d9 
B)  [Ar]4s03d7 
C)  [Ar]4s13d6 
D)  [Ne]3s23p10 
E)  [Ar]4s03d5

Question 10

In which of the molecules below is the carbon- carbon distance the shortest?

Accepted Answer

A)  H3C- CH3 
B)  H3C- CH2- CH3 
C)  H- C≡C- H 
D)  H2C=CH2 
E)  H2C=C=CH2 
A)  H3C- CH3 
B)  H3C- CH2- CH3 
C)  H- C≡C- H 
D)  H2C=CH2 
E)  H2C=C=CH2

Question 11

The ability of an atom in a molecule to attract electrons is best quantified by the .

Accepted Answer

A)  first ionization potential 
B)  diamagnetism 
C)  paramagnetism 
D)  electron change- to- mass ratio 
E)  electronegativity 
A)  first ionization potential 
B)  diamagnetism 
C)  paramagnetism 
D)  electron change- to- mass ratio 
E)  electronegativity

Question 12

Bond enthalpy is .

Accepted Answer

A)  always zero 
B)  always positive 
C)  sometimes positive, sometimes negative 
D)  always negative 
E)  unpredictable 
A)  always zero 
B)  always positive 
C)  sometimes positive, sometimes negative 
D)  always negative 
E)  unpredictable

Question 13

Bond enthalpy can be positive or negative.

Accepted Answer

A) True 
 B)False

Question 14

There are unpaired electrons in the Lewis symbol for an oxygen atom.

Accepted Answer

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

Question 15

How many equivalent resonance structures can be drawn for the molecule of SO3 without having to violate the octet rule on the sulfur atom?

Accepted Answer

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

Question 16

Electronegativity _ from left to right within a period and _ from top to bottom within a group.

Accepted Answer

A)  increases, increases 
B)  stays the same, increases 
C)  decreases, increases 
D)  increases, stays the same 
E)  increases, decreases 
A)  increases, increases 
B)  stays the same, increases 
C)  decreases, increases 
D)  increases, stays the same 
E)  increases, decreases

Question 17

Resonance structures differ by .

Accepted Answer

A)  placement of atoms only 
B)  placement of electrons only 
C)  number of electrons only 
D)  number and placement of electrons 
E)  number of atoms only 
A)  placement of atoms only 
B)  placement of electrons only 
C)  number of electrons only 
D)  number and placement of electrons 
E)  number of atoms only

Question 18

How many equivalent resonance forms can be drawn for CO32- - (carbon is the central atom)?

Accepted Answer

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

Question 19

In a reaction, if the bonds in the reactants are stronger than the bonds in the product, the reaction is .

Accepted Answer

The answer of In a reaction, if the bonds in...

Question 20

A valid Lewis structure of _ _ cannot be drawn without violating the octet rule.

Accepted Answer

A)  CF4  
B)  SO32-  
C)  NF3  
D)  SO2  
E)  BeH2 
A)  CF4  
B)  SO32-  
C)  NF3  
D)  SO2  
E)  BeH2

Exam 8: Basic Concepts of Chemical Bonding

The central atom in _ _ does not violate the octet rule.

Calculate the bond energy of C- F given that the heat of atomization of CHFClBr is 1502 kJ/mol, and that the bond energies of C- H, C- Br, and C- Cl are 413, 276, and 328 kJ/mol, respectively.

For the questions that follow, consider the BEST Lewis structures of the following ox_yanions: -There can be four equivalent best resonance structures of .

The electron configuration of the S2- ion is .

What is the maximum number of double bonds that a carbon atom can form?

For a given arrangement of ions, the lattice energy increases as ionic radius and as ionic charge .

How many single covalent bonds must a silicon atom form to have a complete octet in its valence shell?

The central atom in _ violates the octet rule.

What is the electron configuration for the Co2+ ion?

In which of the molecules below is the carbon- carbon distance the shortest?

The ability of an atom in a molecule to attract electrons is best quantified by the .

Bond enthalpy is .

Bond enthalpy can be positive or negative.

There are unpaired electrons in the Lewis symbol for an oxygen atom.

How many equivalent resonance structures can be drawn for the molecule of SO3 without having to violate the octet rule on the sulfur atom?

Electronegativity _ from left to right within a period and _ from top to bottom within a group.

Resonance structures differ by .

How many equivalent resonance forms can be drawn for CO32- - (carbon is the central atom)?

In a reaction, if the bonds in the reactants are stronger than the bonds in the product, the reaction is .

A valid Lewis structure of _ _ cannot be drawn without violating the octet rule.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The electron configuration of the S²^-ion is .

What is the electron configuration for the Co²⁺ion?

How many equivalent resonance structures can be drawn for the molecule of SO₃without having to violate the octet rule on the sulfur atom?

How many equivalent resonance forms can be drawn for CO₃²^-- (carbon is the central atom)?