Question 1

Considering the electronegativity values indicated for each element, which covalent bond has the least degree of polarity?

Accepted Answer

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

Question 2

The Lewis structure for BH3 contains an atom that does not follow the octet rule.

Accepted Answer

A) True 
 B)False

Question 3

A molecule that contains only one polar bond is a polar molecule.

Accepted Answer

A) True 
 B)False

Question 4

Atoms with seven valence electrons typically form one covalent bond.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Which of the following molecule(s)is(are)polar?

Accepted Answer

A) CO2 
B) CH4 
C) CBr4 
D) CHBr3 
E) More than one of the above molecules are polar. 
A) CO2 
B) CH4 
C) CBr4 
D) CHBr3 
E) More than one of the above molecules are polar.

Question 7

To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper, a solid line is used for the two bonds in the plane of the paper; a _____ is used to show a bond that extends in front of the plane; and a _____ is used to show a bond that extends behind the plane.

Accepted Answer

The answer of To represent the three-dimensional geometry of a...

Question 8

Which Lewis structure is incorrect?

Accepted Answer

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

Question 9

In the Lewis structure of a molecule, oxygen atoms typically have _____ lone pair(s)of electrons.

Accepted Answer

The answer of In the Lewis structure of a molecule,...

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Which element may have more than eight valence electrons around it when present in a covalent compound?

Accepted Answer

A) C 
B) B 
C) N 
D) P 
E) O 
A) C 
B) B 
C) N 
D) P 
E) O

Question 12

A Lewis structure shows the connectivity between atoms in a molecule, as well as where all the bonding and nonbonding valence electrons reside.

Accepted Answer

A) True 
 B)False

Question 13

The chemical formula for phosphorus pentachloride is _____.

Accepted Answer

The answer of The chemical formula for phosphorus pentachloride is...

Question 14

Bonding is the joining of two atoms in a stable arrangement.

Accepted Answer

A) True 
 B)False

Question 15

In general, a _____ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.

Accepted Answer

The answer of In general, a _____ bond will be...

Question 16

How many valence electrons are in a molecule of formaldehyde (CH2O)?

Accepted Answer

A) 16 
B) 12 
C) 10 
D) 8 
E) 0 
A) 16 
B) 12 
C) 10 
D) 8 
E) 0

Question 17

What is the molecular shape around the phosphorus atom in PH3?

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 18

What is the Lewis structure for chloroethylene (C2H3Cl)?

Accepted Answer

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

Question 19

Which of the statements concerning compounds is incorrect?

Accepted Answer

A) Compounds are formed when atoms of two or more different elements are chemically bonded. 
B) Ionic compounds are composed of cations and anions. 
C) Covalent compounds are composed of metals and nonmetals. 
D) Covalent compounds are composed of individual molecules. 
A) Compounds are formed when atoms of two or more different elements are chemically bonded. 
B) Ionic compounds are composed of cations and anions. 
C) Covalent compounds are composed of metals and nonmetals. 
D) Covalent compounds are composed of individual molecules.

Question 20

Rank the atoms Br, Cl, and F in order of increasing electronegativity.

Accepted Answer

A) F < Br < Cl 
B) Cl < Br < F 
C) Br < Cl < F 
D) F < Cl < Br 
E) Cl < F < Br 
A) F < Br < Cl 
B) Cl < Br < F 
C) Br < Cl < F 
D) F < Cl < Br 
E) Cl < F < Br

Exam 4: Covalent Compounds

Considering the electronegativity values indicated for each element, which covalent bond has the least degree of polarity?

The Lewis structure for BH3 contains an atom that does not follow the octet rule.

A molecule that contains only one polar bond is a polar molecule.

Atoms with seven valence electrons typically form one covalent bond.

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

Which of the following molecule(s)is(are)polar?

To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper, a solid line is used for the two bonds in the plane of the paper; a _____ is used to show a bond that extends in front of the plane; and a _____ is used to show a bond that extends behind the plane.

Which Lewis structure is incorrect?

In the Lewis structure of a molecule, oxygen atoms typically have _____ lone pair(s)of electrons.

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

Which element may have more than eight valence electrons around it when present in a covalent compound?

A Lewis structure shows the connectivity between atoms in a molecule, as well as where all the bonding and nonbonding valence electrons reside.

The chemical formula for phosphorus pentachloride is _____.

Bonding is the joining of two atoms in a stable arrangement.

In general, a _____ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.

How many valence electrons are in a molecule of formaldehyde (CH2O)?

What is the molecular shape around the phosphorus atom in PH3?

What is the Lewis structure for chloroethylene (C2H3Cl)?

Which of the statements concerning compounds is incorrect?

Rank the atoms Br, Cl, and F in order of increasing electronegativity.

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 BH₃ contains an atom that does not follow the octet rule.

To represent the three-dimensional geometry of a tetrahedron on a two-dimensional piece of paper, a solid line is used for the two bonds in the plane of the paper; a _ is used to show a bond that extends in front of the plane; and a _ is used to show a bond that extends behind the plane.

How many valence electrons are in a molecule of formaldehyde (CH₂O)?

What is the molecular shape around the phosphorus atom in PH₃?

What is the Lewis structure for chloroethylene (C₂H₃Cl)?