Question 1

In the best Lewis structure for CN -,what is the formal charge on the N atom?

Accepted Answer

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

Question 2

Identify the chemical formula for ozone.

Accepted Answer

A)  O3 
B)  O2 
C)  O 
D)  O2- 
E)  O- 
A)  O3 
B)  O2 
C)  O 
D)  O2- 
E)  O-

Question 3

The electronegativity is 2.1 for H and 2.5 for I.Based on these electronegativities,HI would be expected to

Accepted Answer

A)  be ionic and contain H- ions. 
B)  be ionic and contain H+ ions. 
C)  have polar covalent bonds with a partial negative charges on the H atoms. 
D)  have polar covalent bonds with a partial positive charges on the H atoms. 
A)  be ionic and contain H- ions. 
B)  be ionic and contain H+ ions. 
C)  have polar covalent bonds with a partial negative charges on the H atoms. 
D)  have polar covalent bonds with a partial positive charges on the H atoms.

Question 4

The Lewis structure of sulfuric acid contains

Accepted Answer

A)  2 double bonds, 4 single bonds, and 8 lone pairs. 
B)  4 double bonds, and two single bonds. 
C)  2 double bonds and 4 single bonds. 
D)  6 single bonds and 4 lone pairs. 
E)  2 double bonds, 4 single bonds, and 4 lone pairs. 
A)  2 double bonds, 4 single bonds, and 8 lone pairs. 
B)  4 double bonds, and two single bonds. 
C)  2 double bonds and 4 single bonds. 
D)  6 single bonds and 4 lone pairs. 
E)  2 double bonds, 4 single bonds, and 4 lone pairs.

Question 5

Choose the bond below that is most polar.

Accepted Answer

A)  H-Cl 
B)  H-P 
C)  H-F 
D)  H-Si 
E)  As-H 
A)  H-Cl 
B)  H-P 
C)  H-F 
D)  H-Si 
E)  As-H

Question 6

Identify the bond with the highest bond energy.

Accepted Answer

A)  C≡O 
B)  C≡C 
C)  C≡N 
D)  N≡N 
A)  C≡O 
B)  C≡C 
C)  C≡N 
D)  N≡N

Question 7

Place the following in order of increasing bond length. C-O C-C C-N

Accepted Answer

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

Question 8

Which of the following represents the Lewis structure for N?

Accepted Answer

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

Question 9

Draw the best Lewis structure for FO4⁻ and determine the formal charge on fluorine.

Accepted Answer

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

Question 10

How many of the following elements can form compounds with an expanded octet? P Kr As B

Accepted Answer

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

Question 11

Use Lewis theory to determine the chemical formula for the compound formed between Ba and F.

Accepted Answer

A)  BaF 
B)  Ba2F3 
C)  Ba3F2 
D)  BaF2 
E)  Ba2F 
A)  BaF 
B)  Ba2F3 
C)  Ba3F2 
D)  BaF2 
E)  Ba2F

Question 12

Identify the weakest bond.

Accepted Answer

A)  single covalent bond 
B)  double covalent bond 
C)  triple covalent bond 
D)  All of the above bonds are the same strength. 
A)  single covalent bond 
B)  double covalent bond 
C)  triple covalent bond 
D)  All of the above bonds are the same strength.

Question 13

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Accepted Answer

A)  AlN 
B)  MgO 
C)  LiCl 
D)  CaS 
E)  RbCl 
A)  AlN 
B)  MgO 
C)  LiCl 
D)  CaS 
E)  RbCl

Question 14

Which compound has the shortest carbon-carbon bond length?

Accepted Answer

A)  CH3CH3 
B)  CH2CH2 
C)  HCCH 
D)  All bond lengths are the same. 
A)  CH3CH3 
B)  CH2CH2 
C)  HCCH 
D)  All bond lengths are the same.

Question 15

Which molecule or compound below contains a pure covalent bond?

Accepted Answer

A)  Li2CO3 
B)  SCl6 
C)  Br2 
D)  PI3 
E)  LiBr 
A)  Li2CO3 
B)  SCl6 
C)  Br2 
D)  PI3 
E)  LiBr

Question 16

Which of the following processes is exothermic?

Accepted Answer

A)  Br2(g) → 2Br(g) 
B)  F(g) + e⁻ → F⁻(g) 
C)  Li(g) → Li(g) 
D)  KI(g) → K⁺(g) + I⁻(g) 
E)  None of the above is exothermic. 
A)  Br2(g) → 2Br(g) 
B)  F(g) + e⁻ → F⁻(g) 
C)  Li(g) → Li(g) 
D)  KI(g) → K⁺(g) + I⁻(g) 
E)  None of the above is exothermic.

Question 17

Choose the compound below that should have the lowest melting point according to the ionic bonding model.

Accepted Answer

A)  LiF 
B)  LiCl 
C)  CsI 
D)  KBr 
E)  RbBr 
A)  LiF 
B)  LiCl 
C)  CsI 
D)  KBr 
E)  RbBr

Question 18

Choose the best Lewis structure for BeF2.

Accepted Answer

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

Question 19

Identify the compound with atoms that have an incomplete octet.

Accepted Answer

A)  ICl5 
B)  CO2 
C)  BF3 
D)  Cl2 
E)  CCl4 
A)  ICl5 
B)  CO2 
C)  BF3 
D)  Cl2 
E)  CCl4

Question 20

Which of the following processes is exothermic?

Accepted Answer

A)  the second ionization energy of Mg 
B)  the sublimation of Li 
C)  the breaking the bond of Cl2 
D)  the formation of KI from its constituent elements in their standard state 
E)  None of the above is exothermic 
A)  the second ionization energy of Mg 
B)  the sublimation of Li 
C)  the breaking the bond of Cl2 
D)  the formation of KI from its constituent elements in their standard state 
E)  None of the above is exothermic

Exam 9: Chemical Bonding I: Lewis Theory

In the best Lewis structure for CN -,what is the formal charge on the N atom?

Identify the chemical formula for ozone.

The electronegativity is 2.1 for H and 2.5 for I.Based on these electronegativities,HI would be expected to

The Lewis structure of sulfuric acid contains

Choose the bond below that is most polar.

Identify the bond with the highest bond energy.

Place the following in order of increasing bond length. C-O C-C C-N

Which of the following represents the Lewis structure for N?

Draw the best Lewis structure for FO4⁻ and determine the formal charge on fluorine.

How many of the following elements can form compounds with an expanded octet? P Kr As B

Use Lewis theory to determine the chemical formula for the compound formed between Ba and F.

Identify the weakest bond.

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Which compound has the shortest carbon-carbon bond length?

Which molecule or compound below contains a pure covalent bond?

Which of the following processes is exothermic?

Choose the compound below that should have the lowest melting point according to the ionic bonding model.

Choose the best Lewis structure for BeF2.

Identify the compound with atoms that have an incomplete octet.

Which of the following processes is exothermic?

Matter, measurement, and Problem Solving

Atoms and Elements

Molecules,compounds,and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding Ii: Molecular Shapes,valence Bond Theory,

Liquids,solids,and Intermolecular Forces

Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

In the best Lewis structure for CN^-,what is the formal charge on the N atom?

Draw the best Lewis structure for FO₄⁻ and determine the formal charge on fluorine.

Choose the best Lewis structure for BeF₂.