Question 1

Identify the diatomic element from the given choices.

Accepted Answer

A) Phosphorus 
B) Helium 
C) Nitrogen 
D) Silicon 
E) Sodium 
A) Phosphorus 
B) Helium 
C) Nitrogen 
D) Silicon 
E) Sodium

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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 4

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 5

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 6

How many total valence electrons does the polyatomic ion NH4+ possess?

Accepted Answer

A) 8 
B) 9 
C) 10 
D) 11 
E) 7 
A) 8 
B) 9 
C) 10 
D) 11 
E) 7

Question 7

Covalent bonds result from the ________ electrons between two atoms.

Accepted Answer

A) transfer of 
B) equal sharing of 
C) unequal sharing of 
D) Transfer of,equal sharing of,and unequal sharing of are correct. 
E) Equal sharing of and unequal sharing of are correct. 
A) transfer of 
B) equal sharing of 
C) unequal sharing of 
D) Transfer of,equal sharing of,and unequal sharing of are correct. 
E) Equal sharing of and unequal sharing of are correct.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

How many lone pairs of electrons need to be added to the Lewis structure of carbonic acid shown below?

Accepted Answer

A) 0 
B) 3 
C) 4 
D) 6 
E) 7 
A) 0 
B) 3 
C) 4 
D) 6 
E) 7

Question 10

Electronegativity ________ down a column of the periodic table as the atomic radius increases.

Accepted Answer

The answer of Electronegativity ________ down a column of the...

Question 11

Which atom(s)in the structure below has(have)a partial negative charge (δ-)?

Accepted Answer

A) Carbon 
B) Fluorine 
C) Hydrogen 
D) Nitrogen 
E) Nitrogen and fluorine 
A) Carbon 
B) Fluorine 
C) Hydrogen 
D) Nitrogen 
E) Nitrogen and fluorine

Question 12

Which Lewis structure is incorrect?

Accepted Answer

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

Question 13

What is another name for an unshared pair of electrons in a covalent compound?

Accepted Answer

A) Lone pair of electrons 
B) Nonbonded electron pair 
C) Bonding pair of electrons 
D) Lone pair of electrons or nonbonded electron pair 
A) Lone pair of electrons 
B) Nonbonded electron pair 
C) Bonding pair of electrons 
D) Lone pair of electrons or nonbonded electron pair

Question 14

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

Accepted Answer

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

Question 15

Which choice would be named dinitrogen pentoxide?

Accepted Answer

A) N2O5 
B) N5O2 
C) N3O2 
D) N2O3 
E) NO 
A) N2O5 
B) N5O2 
C) N3O2 
D) N2O3 
E) NO

Question 16

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 17

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 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

Dibromomethane (CH2Br2)is a nonpolar molecule.

Accepted Answer

A) True 
 B)False

Exam 4: Covalent Compounds

Identify the diatomic element from the given choices.

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

What are the bond angles in a tetrahedral geometry?

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

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

How many total valence electrons does the polyatomic ion NH4+ possess?

Covalent bonds result from the ________ electrons between two atoms.

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

How many lone pairs of electrons need to be added to the Lewis structure of carbonic acid shown below?

Electronegativity ________ down a column of the periodic table as the atomic radius increases.

Which atom(s)in the structure below has(have)a partial negative charge (δ-)?

Which Lewis structure is incorrect?

What is another name for an unshared pair of electrons in a covalent compound?

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

Which choice would be named dinitrogen pentoxide?

Which bond is the MOST polar?

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

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

Dibromomethane (CH2Br2)is a nonpolar 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

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

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

How many total valence electrons does the polyatomic ion NH₄⁺ possess?

Which atom(s)in the structure below has(have)a partial negative charge (δ^-)?

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

Dibromomethane (CH₂Br₂)is a nonpolar molecule.