Question 1

An exothermic reaction should have ________ chemical bonds and decompose to a molecule with ________ bonds.

Accepted Answer

weak,strong

Question 2

Given that the average bond energies for C-H and C-Br bonds are 413 and 276 kJ/mol,respectively,the heat of atomization of bromoform (CHBr3)is ________ kJ/mol.

Accepted Answer

A) 1241 
B) 689 
C) -689 
D) 1378 
E) -1378 
A) 1241 
B) 689 
C) -689 
D) 1378 
E) -1378 A

Question 3

Using the table of average bond energies below,the △H for the reaction is ________ kJ. H3C-O-H (g)→ C≡O (g)+ 2H2 (g)
Bond: C-O C=O C≡O C-H H-H O-H
D (kJ/mol): 358 799 1072 413 436 463

Accepted Answer

A) +276 
B) -276 
C) +116 
D) +735 
E) -116 
A) +276 
B) -276 
C) +116 
D) +735 
E) -116 C

Question 4

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

Accepted Answer

A) NI3 
B) SO2 
C) ICl5 
D) SiF4 
E) CO2 
A) NI3 
B) SO2 
C) ICl5 
D) SiF4 
E) CO2

Question 5

How many covalent bonds are in the Lewis Structure of CH3CHCl2.?

Accepted Answer

A) 6 
B) 8 
C) 7 
D) 5 
E) 4 
A) 6 
B) 8 
C) 7 
D) 5 
E) 4

Question 6

The ________ ion has eight valence electrons.

Accepted Answer

A) Sc3+ 
B) Ti3+ 
C) V3+ 
D) Cr3+ 
E) Mn3+ 
A) Sc3+ 
B) Ti3+ 
C) V3+ 
D) Cr3+ 
E) Mn3+

Question 7

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

Accepted Answer

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

Question 8

Given the electronegativities below,which covalent single bond is most polar?
Element: H C N O
Electronegativity: 2.1 2.5 3.0 3.5

Accepted Answer

A) C-H 
B) N-H 
C) O-H 
D) O-C 
E) O-N 
A) C-H 
B) N-H 
C) O-H 
D) O-C 
E) O-N

Question 9

Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration?
O Sr Na Se Br

Accepted Answer

A) O, Se 
B) Sr 
C) Na 
D) Br 
E) Sr, O, Se 
A) O, Se 
B) Sr 
C) Na 
D) Br 
E) Sr, O, Se

Question 10

In the Lewis structure of HCO3-,the formal charge on H is ________,and the formal charge on C is ________.

Accepted Answer

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

Question 11

The formal charge on sulfur in SO42- is ________,where the Lewis structure of the ion is:

Accepted Answer

A) -2 
B) 0 
C) +2 
D) +4 
E) -4 
A) -2 
B) 0 
C) +2 
D) +4 
E) -4

Question 12

Ni2+ ions are represented by the electron configuration ________.

Accepted Answer

A) [Ar]3d8 
B) [Ar]3d10 
C) [Ar]3d6 
D) [Ar]4s23d6 
E) [Kr]4d8 
A) [Ar]3d8 
B) [Ar]3d10 
C) [Ar]3d6 
D) [Ar]4s23d6 
E) [Kr]4d8

Question 13

Of the bonds below,________ is the least polar.

Accepted Answer

A) C-O 
B) N-O 
C) C-F 
D) S-O 
E) K-Br 
A) C-O 
B) N-O 
C) C-F 
D) S-O 
E) K-Br

Question 14

Which of the following Lewis structures would be an expansion to the octet rule?

Accepted Answer

A) SiF4 
B) CF4 
C) CCl4 
D) PO43- 
E) NF3 
A) SiF4 
B) CF4 
C) CCl4 
D) PO43- 
E) NF3

Question 15

Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration?
O Sr Na Se Br

Accepted Answer

A) Br 
B) Sr 
C) Na 
D) O, Se 
E) Sr, O, Se 
A) Br 
B) Sr 
C) Na 
D) O, Se 
E) Sr, O, Se

Question 16

Determining lattice energy from Born-Haber cycle data requires the use of ________.

Accepted Answer

A) the octet rule 
B) Coulomb's law 
C) Periodic law 
D) Hess's law 
E) Avogadro's number 
A) the octet rule 
B) Coulomb's law 
C) Periodic law 
D) Hess's law 
E) Avogadro's number

Question 17

The electron configuration that corresponds to the Lewis symbol,:   : is ________.

Accepted Answer

The answer of The electron configuration that corresponds to the...

Question 18

Which halogen,bromine or iodine,will form the more polar bond with phosphorus?

Accepted Answer

The answer of Which halogen,bromine or iodine,will form the more...

Question 19

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

Accepted Answer

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

Question 20

There can be three equivalent best resonance structures of ________.

Accepted Answer

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

Exam 8: Basic Concepts of Chemical Bonding

An exothermic reaction should have ________ chemical bonds and decompose to a molecule with ________ bonds.

Given that the average bond energies for C-H and C-Br bonds are 413 and 276 kJ/mol,respectively,the heat of atomization of bromoform (CHBr3)is ________ kJ/mol.

Using the table of average bond energies below,the △H for the reaction is ________ kJ. H3C-O-H (g)→ C≡O (g)+ 2H2 (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol): 358 799 1072 413 436 463

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

How many covalent bonds are in the Lewis Structure of CH3CHCl2.?

The ________ ion has eight valence electrons.

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

Given the electronegativities below,which covalent single bond is most polar? Element: H C N O Electronegativity: 2.1 2.5 3.0 3.5

Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

In the Lewis structure of HCO3-,the formal charge on H is ________,and the formal charge on C is ________.

The formal charge on sulfur in SO42- is ________,where the Lewis structure of the ion is:

Ni2+ ions are represented by the electron configuration ________.

Of the bonds below,________ is the least polar.

Which of the following Lewis structures would be an expansion to the octet rule?

Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

Determining lattice energy from Born-Haber cycle data requires the use of ________.

The electron configuration that corresponds to the Lewis symbol,: : is ________.

Which halogen,bromine or iodine,will form the more polar bond with phosphorus?

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

There can be three equivalent best resonance structures of ________.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

An exothermic reaction should have chemical bonds and decompose to a molecule with bonds.

Given that the average bond energies for C-H and C-Br bonds are 413 and 276 kJ/mol,respectively,the heat of atomization of bromoform (CHBr₃)is ________ kJ/mol.

Using the table of average bond energies below,the △H for the reaction is ________ kJ. H₃C-O-H (g)→ C≡O (g)+ 2H₂ (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol): 358 799 1072 413 436 463

How many covalent bonds are in the Lewis Structure of CH₃CHCl₂.?

In the Lewis structure of HCO₃^-,the formal charge on H is ,and the formal charge on C is .

The formal charge on sulfur in SO₄^2- is ________,where the Lewis structure of the ion is:

Ni²⁺ ions are represented by the electron configuration ________.

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