Question 1

Dibromomethane (CH2Br2)is a nonpolar molecule.

Accepted Answer

A) True 
 B)False

Question 2

The molecule below is a polar molecule.

Accepted Answer

A) True 
 B)False

Question 3

The structures shown below are resonance structures of sulfur dioxide.   and

Accepted Answer

A) True 
 B)False

Question 4

What is the total number of bonding electrons in the structure below?

Accepted Answer

A) 5 
B) 10 
C) 20 
D) 30 
A) 5 
B) 10 
C) 20 
D) 30

Question 5

A bond formed between the elements hydrogen and bromine would be considered an ionic bond.

Accepted Answer

A) True 
 B)False

Question 6

The structures shown below are resonance structures of sulfur dioxide.   and

Accepted Answer

A) True 
 B)False

Question 7

A molecule is a discrete group of atoms held together by covalent bonds.

Accepted Answer

A) True 
 B)False

Question 8

The shapes around the left and right carbon atoms in the structure below are tetrahedral and linear, respectively.

Accepted Answer

A) True 
 B)False

Question 9

What are the bond angles in a tetrahedral geometry?

Accepted Answer

A) 180° 
B) 120° 
C) 109.5° 
D) 90° 
E) 60° 
A) 180° 
B) 120° 
C) 109.5° 
D) 90° 
E) 60°

Question 10

Carbon usually forms four bonds in stable molecules. However unstable carbon compounds with less than four bonds are known. The methyl carbanion shown below is an example. The molecular shape around the carbon atom in this structure is _____.

Accepted Answer

The answer of Carbon usually forms four bonds in stable...

Question 11

Which bond has the polarity incorrectly labeled?

Accepted Answer

A)  $\delta$ + H-Cl  $\delta$ - 
B)  $\delta$ + O-C  $\delta$ - 
C)  1$\delta$ + Cl-   $\delta$ - 
D)  $\delta$ - Cl-Br  $\delta$ + 
E)  $\delta$ - F-O  $\delta$ + 
A)  $\delta$ + H-Cl  $\delta$ - 
B)  $\delta$ + O-C  $\delta$ - 
C)  1$\delta$ + Cl-   $\delta$ - 
D)  $\delta$ - Cl-Br  $\delta$ + 
E)  $\delta$ - F-O  $\delta$ +

Question 12

How many covalent bonds are generally formed by atoms with five valence electrons?

Accepted Answer

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

Question 13

In Lewis structures, fluorine atoms generally do not obey the octet rule.

Accepted Answer

A) True 
 B)False

Question 14

What is the chemical formula for dinitrogen tetroxide?

Accepted Answer

A) N4O2 
B) O4N2 
C) N2O4 
D) O2N4 
E) NO2 
A) N4O2 
B) O4N2 
C) N2O4 
D) O2N4 
E) NO2

Question 15

A diatomic molecule contains I. atoms of two different elements bonded together with a covalent bond.
II. two atoms of the same element bonded together with a covalent bond.
III. two lone pairs of electrons.

Accepted Answer

A) I only 
B) II only 
C) III only 
D) I or II only 
E) I and III only 
A) I only 
B) II only 
C) III only 
D) I or II only 
E) I and III only

Question 16

What is the molecular shape around the nitrogen atom in the structure shown below?

Accepted Answer

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

Question 17

Which molecule or ion has only two resonance structures to describe its bonding?

Accepted Answer

A) CO32- 
B) NO3- 
C) HCO31- 
D) SO3 
A) CO32- 
B) NO3- 
C) HCO31- 
D) SO3

Question 18

Which bond is the most polar?

Accepted Answer

A) C-N 
B) C-O 
C) C-C 
D) C-Cl 
E) C-F 
A) C-N 
B) C-O 
C) C-C 
D) C-Cl 
E) C-F

Question 19

Resonance structures for a substance differ only in the location of multiple bonds and the position of lone electron pairs.

Accepted Answer

A) True 
 B)False

Question 20

There can be a no more than two resonance structures for a molecule.

Accepted Answer

A) True 
 B)False

Exam 4: Covalent Compounds

Dibromomethane (CH2Br2)is a nonpolar molecule.

The molecule below is a polar molecule.

The structures shown below are resonance structures of sulfur dioxide. and

What is the total number of bonding electrons in the structure below?

A bond formed between the elements hydrogen and bromine would be considered an ionic bond.

The structures shown below are resonance structures of sulfur dioxide. and

A molecule is a discrete group of atoms held together by covalent bonds.

The shapes around the left and right carbon atoms in the structure below are tetrahedral and linear, respectively.

What are the bond angles in a tetrahedral geometry?

Carbon usually forms four bonds in stable molecules. However unstable carbon compounds with less than four bonds are known. The methyl carbanion shown below is an example. The molecular shape around the carbon atom in this structure is _____.

Which bond has the polarity incorrectly labeled?

How many covalent bonds are generally formed by atoms with five valence electrons?

In Lewis structures, fluorine atoms generally do not obey the octet rule.

What is the chemical formula for dinitrogen tetroxide?

A diatomic molecule contains I. atoms of two different elements bonded together with a covalent bond. II. two atoms of the same element bonded together with a covalent bond. III. two lone pairs of electrons.

What is the molecular shape around the nitrogen atom in the structure shown below?

Which molecule or ion has only two resonance structures to describe its bonding?

Which bond is the most polar?

Resonance structures for a substance differ only in the location of multiple bonds and the position of lone electron pairs.

There can be a no more than two resonance structures for a molecule.

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

Dibromomethane (CH₂Br₂)is a nonpolar molecule.