Question 1

What statement about the ammonia molecule, NH3, is FALSE?

Accepted Answer

A)  The molecule contains three polar bonds.
B)  The molecule itself is not polar.
C)  The molecule has a trigonal pyramidal shape.
D)  The nitrogen atom has one nonbonding pair of electrons.
E)  The pull of the electrons in the N?H bonds is toward the nitrogen atom.F) A) and B)
G) C) and E)

Question 2

Which of the following Lewis structures represent resonance forms of ozone, O3? 3?   A) A and B B) B and C C) C and D D) A and C E) A and D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A and B
B)  B and C
C)  C and D
D)  A and C
E)  A and DF) None of the above
G) All of the above

Question 3

Which compound contains a central atom with an exception to the octet rule known as an expanded octet?

Accepted Answer

A)  BeH2
B)  NO
C)  PF5
D)  CH4
E)  BF3F) None of the above
G) A) and B)

Question 4

How many bonding electrons are in CO2?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  8F) D) and E)
G) B) and E)

Question 5

Which statement about compounds is FALSE?

Accepted Answer

A)  Compounds consist of atoms of two or more different elements that are chemically bonded together.
B)  The elements in a compound cannot be separated or recovered by a physical process.
C)  Ionic compounds are composed of cations and anions.
D)  Covalent compounds are composed of metals and nonmetals.
E)  Intermolecular forces are attractive forces between molecules of a compound, and are responsible for the compound?s physical properties.F) B) and E)
G) A) and B)

Question 6

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N3−, what is the formula of sodium azide?

Accepted Answer

A)  NaN3
B)  Na3N3
C)  Na3(N3) 3
D)  Na3N
E)  Na(N3) 3F) D) and E)
G) C) and D)

Question 7

What is the name of the ion NH4+?

Accepted Answer

A)  nitrogen tetrahydrate
B)  nitrogen hydrate
C)  mononitrogen tetrahydrogen
D)  ninhydrin
E)  ammoniumF) A) and B)
G) A) and C)

Question 8

Draw the Lewis structures of F2, O2 and N2.Which statement is true?

Accepted Answer

A)  All three molecules have a single bond between the atoms.
B)  Both O2 and N2 have double bonds connecting the atoms.
C)  Fluorine has the shortest bond between the two atoms.
D)  The bond between the nitrogen atoms in N2 is stronger than the bond in F2 and O2.
E)  All three molecules have triple bonds between the atoms.F) C) and D)
G) C) and E)

Question 9

Because the C-H bond in methane is polar, the CH4 molecule will also be polar.

Accepted Answer

A) True 
 B)False

Question 10

A molecule of deoxyribose, an essential part of DNA, contains five carbon atoms, ten hydrogen atoms, and four oxygen atoms.How would the formula of deoxyribose be represented?

Accepted Answer

A)  5C10H4O
B)  C5H10O4
C)  C5H10O4
D)  C5H10O4
E)  All formulas are acceptable.F) A) and E)
G) A) and D)

Question 11

In the molecule AX2, the central atom A has two lone pairs of electrons in addition to the two bond pairs in the A-X bonds.What is the shape of this molecule?

Accepted Answer

A)  bent, bond angle close to 109.5o
B)  bent, bond angle close to 120o
C)  linear
D)  trigonal planar
E)  trigonal pyramidalF) B) and C)
G) A) and B)

Exam 3: Structure and Properties of Ionic and Covalent Compounds

In the molecule AX₂, the central atom A has two lone pairs of electrons in addition to the two bond pairs in the A-X bonds.What is the shape of this molecule?

Correct Answer
verified

Which compound contains a central atom with an exception to the octet rule known as an expanded octet?

Correct Answer
verified

Draw the Lewis structures of F₂, O₂ and N₂.Which statement is true?

Correct Answer
verified

A molecule of deoxyribose, an essential part of DNA, contains five carbon atoms, ten hydrogen atoms, and four oxygen atoms.How would the formula of deoxyribose be represented?

Correct Answer
verified

How many bonding electrons are in CO₂?

Correct Answer
verified

What is the name of the ion NH₄+_?

Correct Answer
verified

Which statement about compounds is FALSE?

Correct Answer
verified

What statement about the ammonia molecule, NH₃, is FALSE?

Correct Answer
verified

Because the C-H bond in methane is polar, the CH₄ molecule will also be polar.

Correct Answer
verified

Which of the following Lewis structures represent resonance forms of ozone, O₃?

Correct Answer
verified

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N₃−_, what is the formula of sodium azide?

Correct Answer
verified

Exam 3: Structure and Properties of Ionic and Covalent Compounds

In the molecule AX2, the central atom A has two lone pairs of electrons in addition to the two bond pairs in the A-X bonds.What is the shape of this molecule?

Correct AnswerverifiedShow Answer

Which compound contains a central atom with an exception to the octet rule known as an expanded octet?

Correct AnswerverifiedShow Answer

Draw the Lewis structures of F2, O2 and N2.Which statement is true?

Correct AnswerverifiedShow Answer

A molecule of deoxyribose, an essential part of DNA, contains five carbon atoms, ten hydrogen atoms, and four oxygen atoms.How would the formula of deoxyribose be represented?

Correct AnswerverifiedShow Answer

How many bonding electrons are in CO2?

Correct AnswerverifiedShow Answer

What is the name of the ion NH4+?

Correct AnswerverifiedShow Answer

Which statement about compounds is FALSE?

Correct AnswerverifiedShow Answer

What statement about the ammonia molecule, NH3, is FALSE?

Correct AnswerverifiedShow Answer

Because the C-H bond in methane is polar, the CH4 molecule will also be polar.

Correct AnswerverifiedShow Answer

Which of the following Lewis structures represent resonance forms of ozone, O3?

Correct AnswerverifiedShow Answer

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N3−, what is the formula of sodium azide?

Correct AnswerverifiedShow Answer

In the molecule AX₂, the central atom A has two lone pairs of electrons in addition to the two bond pairs in the A-X bonds.What is the shape of this molecule?

Correct Answer
verified

Correct Answer
verified

Draw the Lewis structures of F₂, O₂ and N₂.Which statement is true?

Correct Answer
verified

Correct Answer
verified

How many bonding electrons are in CO₂?

Correct Answer
verified

What is the name of the ion NH₄+_?

Correct Answer
verified

Correct Answer
verified

What statement about the ammonia molecule, NH₃, is FALSE?

Correct Answer
verified

Because the C-H bond in methane is polar, the CH₄ molecule will also be polar.

Correct Answer
verified

Which of the following Lewis structures represent resonance forms of ozone, O₃?

Correct Answer
verified

Vehicle airbags inflate when the ionic compound sodium azide rapidly decomposes to the elements sodium and nitrogen.If the azide ion is a polyatomic ion with the formula N₃−_, what is the formula of sodium azide?

Correct Answer
verified