Question 1

Double bonds and triple bonds are never polar bonds.

Accepted Answer

A) True 
 B)False

Question 2

Carbon tetrachloride has ________ valence electrons.

Accepted Answer

A) 4 (four) 
B) 8 (eight) 
C) 24 (twenty-four) 
D) 32 (thirty-two) 
E) 40 (forty) 
A) 4 (four) 
B) 8 (eight) 
C) 24 (twenty-four) 
D) 32 (thirty-two) 
E) 40 (forty)

Question 3

Nonpolar molecules may contain polar bonds.

Accepted Answer

A) True 
 B)False

Question 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

When writing Lewis structures,the symbol below is placed between resonance structures.

Accepted Answer

A) True 
 B)False

Question 7

Which statement concerning chemical bonds is FALSE?

Accepted Answer

A) A covalent bond involves the sharing of electrons between two nonmetal atoms. 
B) An ionic bond is the attraction between oppositely charged ions. 
C) A nonpolar bond is a covalent bond in which electrons are not shared equally between the atoms. 
D) Electronegativity is a measure of the attraction an atom has for the electrons it shares in a bond. 
A) A covalent bond involves the sharing of electrons between two nonmetal atoms. 
B) An ionic bond is the attraction between oppositely charged ions. 
C) A nonpolar bond is a covalent bond in which electrons are not shared equally between the atoms. 
D) Electronegativity is a measure of the attraction an atom has for the electrons it shares in a bond.

Question 8

How many covalent bonds are generally formed by an oxygen atom?

Accepted Answer

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

Question 9

Atoms with three valence electrons generally form five bonds.

Accepted Answer

A) True 
 B)False

Question 10

A N-O bond is more polar than a P-O bond.

Accepted Answer

A) True 
 B)False

Question 11

The Lewis structure of formaldehyde is shown below. Which statement concerning this structure is INCORRECT?

Accepted Answer

A) Two electrons are being shared between the carbon atom and the oxygen atom. 
B) The oxygen atom has four valence electrons that are not being shared with another atom. 
C) The oxygen and carbon atoms each have an octet of electrons in their valence shells. 
D) The hydrogen atoms have filled valence shells. 
A) Two electrons are being shared between the carbon atom and the oxygen atom. 
B) The oxygen atom has four valence electrons that are not being shared with another atom. 
C) The oxygen and carbon atoms each have an octet of electrons in their valence shells. 
D) The hydrogen atoms have filled valence shells.

Question 12

Which of the following elements will generally form only one covalent bond?

Accepted Answer

A) Sulfur 
B) Carbon 
C) Hydrogen 
D) Argon 
E) Nitrogen 
A) Sulfur 
B) Carbon 
C) Hydrogen 
D) Argon 
E) Nitrogen

Question 13

The Lewis structure shown below is not a valid Lewis structure. What statement best describes the error in the structure?

Accepted Answer

A) The nitrogen atoms violate the octet rule. 
B) The chlorine atoms violate the octet rule. 
C) The structure contains an incorrect number of valence electrons. 
D) Chlorine atoms and nitrogen atoms do not typically form bonds with each other. 
A) The nitrogen atoms violate the octet rule. 
B) The chlorine atoms violate the octet rule. 
C) The structure contains an incorrect number of valence electrons. 
D) Chlorine atoms and nitrogen atoms do not typically form bonds with each other.

Question 14

Which is the correct Lewis structure for OBr-?

Accepted Answer

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

Question 15

Some covalent compounds are solids,some are liquids,and some are gases at room temperature.

Accepted Answer

A) True 
 B)False

Question 16

In the valence shell electron pair repulsion (VSEPR)theory,a group is defined as an atom or a lone pair of electrons.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is classified as a group in the valence shell electron pair repulsion (VSEPR)theory?

Accepted Answer

A) An atom 
B) A lone pair of electrons 
C) A valence electron 
D) Either an atom or a valence electron 
E) Either an atom or a lone pair of electrons 
A) An atom 
B) A lone pair of electrons 
C) A valence electron 
D) Either an atom or a valence electron 
E) Either an atom or a lone pair of electrons

Question 18

Which molecule's Lewis structure contains an atom that violates the octet rule?

Accepted Answer

A) H2O 
B) BeH2 
C) PCl3 
D) H2Se 
A) H2O 
B) BeH2 
C) PCl3 
D) H2Se

Question 19

Which choice would be named carbon tetrachloride?

Accepted Answer

A) CCl 
B) C4Cl 
C) CCl4 
D) CCl3 
E) C3Cl 
A) CCl 
B) C4Cl 
C) CCl4 
D) CCl3 
E) C3Cl

Question 20

C-H bonds are considered to be nonpolar,because the electronegativity difference between carbon and hydrogen is small.

Accepted Answer

A) True 
 B)False

Exam 4: Covalent Compounds

Double bonds and triple bonds are never polar bonds.

Carbon tetrachloride has ________ valence electrons.

Nonpolar molecules may contain polar bonds.

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 ________.

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

When writing Lewis structures,the symbol below is placed between resonance structures.

Which statement concerning chemical bonds is FALSE?

How many covalent bonds are generally formed by an oxygen atom?

Atoms with three valence electrons generally form five bonds.

A N-O bond is more polar than a P-O bond.

The Lewis structure of formaldehyde is shown below. Which statement concerning this structure is INCORRECT?

Which of the following elements will generally form only one covalent bond?

The Lewis structure shown below is not a valid Lewis structure. What statement best describes the error in the structure?

Which is the correct Lewis structure for OBr-?

Some covalent compounds are solids,some are liquids,and some are gases at room temperature.

In the valence shell electron pair repulsion (VSEPR)theory,a group is defined as an atom or a lone pair of electrons.

Which of the following is classified as a group in the valence shell electron pair repulsion (VSEPR)theory?

Which molecule's Lewis structure contains an atom that violates the octet rule?

Which choice would be named carbon tetrachloride?

C-H bonds are considered to be nonpolar,because the electronegativity difference between carbon and hydrogen is small.

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

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

Which is the correct Lewis structure for OBr^-?