Question 1

The Lewis structure for N2Cl4 is _____.

Accepted Answer

Question 2

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  True

Question 3

Carbon tetrachloride has _____ valence electrons.

Accepted Answer

thirty-two or 32

Question 4

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 5

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 6

The symbol  $\delta$ - is given to the more electronegative atom in a polar bond.

Accepted Answer

A) True 
 B)False

Question 7

Unequal sharing of electrons in a covalent bond results in a polar bond.

Accepted Answer

A) True 
 B)False

Question 8

The Lewis structure for PH3 contains an atom that does not follow the octet rule.

Accepted Answer

A) True 
 B)False

Question 9

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 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

What is the correct chemical formula of selenium dioxide?

Accepted Answer

A) SO2 
B) SeO2 
C) Se2O 
D) OS2 
A) SO2 
B) SeO2 
C) Se2O 
D) OS2

Question 13

How many lone pairs of electrons are present in the Lewis structure of ammonia, NH3?

Accepted Answer

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

Question 14

Which atom has the lowest electronegativity?

Accepted Answer

A) Al 
B) S 
C) Se 
D) Rb 
E) F 
A) Al 
B) S 
C) Se 
D) Rb 
E) F

Question 15

Which of the statements concerning chemical bonds is false?

Accepted Answer

A) The sharing of electrons between two nonmetal atoms results in a covalent bond. 
B) The attraction between oppositely charged ions results in an ionic bond. 
C) The term nonpolar is used to describe a covalent bond in which electrons are not shared equally. 
D) A bond dipole is the separation of charge that results when atoms sharing electrons have different electronegativities. 
A) The sharing of electrons between two nonmetal atoms results in a covalent bond. 
B) The attraction between oppositely charged ions results in an ionic bond. 
C) The term nonpolar is used to describe a covalent bond in which electrons are not shared equally. 
D) A bond dipole is the separation of charge that results when atoms sharing electrons have different electronegativities.

Question 16

Predict the bond angles around the carbon atom in the structure of carbonic acid shown below. Don't forget to draw in lone pairs where needed to give octets.

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 17

Aspartic acid is an amino acid used to synthesize proteins. There are _____ atoms with a trigonal planar geometry in the aspartic acid structure shown here.

Accepted Answer

The answer of Aspartic acid is an amino acid used...

Question 18

Atoms with three valence electrons generally form five bonds.

Accepted Answer

A) True 
 B)False

Question 19

The formula for dinitrogen pentoxide is N5O2.

Accepted Answer

A) True 
 B)False

Question 20

How many nonbonded electron pairs are in the Lewis structure below?

Accepted Answer

A) 2 
B) 4 
C) 6 
D) 8 
E) 16 
A) 2 
B) 4 
C) 6 
D) 8 
E) 16

Exam 4: Covalent Compounds

The Lewis structure for N2Cl4 is _____.

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

Carbon tetrachloride has _____ valence electrons.

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

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

The symbol δ\deltaδ - is given to the more electronegative atom in a polar bond.

Unequal sharing of electrons in a covalent bond results in a polar bond.

The Lewis structure for PH3 contains an atom that does not follow the octet rule.

Which statement concerning chemical bonds is false?

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

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

What is the correct chemical formula of selenium dioxide?

How many lone pairs of electrons are present in the Lewis structure of ammonia, NH3?

Which atom has the lowest electronegativity?

Which of the statements concerning chemical bonds is false?

Predict the bond angles around the carbon atom in the structure of carbonic acid shown below. Don't forget to draw in lone pairs where needed to give octets.

Aspartic acid is an amino acid used to synthesize proteins. There are _____ atoms with a trigonal planar geometry in the aspartic acid structure shown here.

Atoms with three valence electrons generally form five bonds.

The formula for dinitrogen pentoxide is N5O2.

How many nonbonded electron pairs are in the Lewis structure below?

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

The Lewis structure for N₂Cl₄ is _____.

The symbol $\delta$ ^- is given to the more electronegative atom in a polar bond.

The Lewis structure for PH₃ contains an atom that does not follow the octet rule.

How many lone pairs of electrons are present in the Lewis structure of ammonia, NH₃?

The formula for dinitrogen pentoxide is N₅O₂.