Chemistry: Matter and Change

Chapter 8: Covalent Bonding

Standardized Test Practice

1
When two or more atoms join together by sharing their outermost electrons, ________.
A)an ionic compound is formed
B)a molecular compound is formed
C)a mixture is formed
D)a solution is formed
2
How many sigma and how many pi bonds are present in the ethene molecule (C2H4)?
A)4 sigma and 2 pi
B)5 sigma and 2 pi
C)4 sigma and 1 pi
D)5 sigma and 1 pi
3
Which of the following statements is true?

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A)Nitrogen's triple bond is shorter than oxygen's double bond, so it is stronger.
B)Nitrogen's triple bond is longer than oxygen's double bond, so it Is weaker.
C)Nitrogen's triple bond is longer than oxygen's double bond, so it is stronger.
D)Nitrogen's triple bond is shorter than oxygen's double bond so it is weaker.
4
What is the molecular compound name for hydrazine, N2H4?

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A)dinitrogen hydride
B)dinitrogen tetrahydride
C)trinitrogen pentahydride
D)trinitrogen quatrohydride
5
What is the correct name for H2SO3 in an aqueous solution?

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A)sulfuric acid
B)sulfurous acid
C)hydrosulfuric acid
D)hydrosulfic acid
6
Explain why the molecular compounds in the table are not normally referred to by their molecular names.

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A)The molecular names are too complex and hard to say.
B)The common names existed long before the present-day naming system was developed.
C)The common names give more information about the molecular structures of the compounds.
D)The common names follow a strict set of naming rules.
7
When a hydrogen atom is part of a molecular structure, it is always a ________ atom.
A)terminal
B)ionic
C)central
D)1-
8
When two or more Lewis structures can be used to represent a single molecule, these multiple structures are ______________.
A)resonance structures
B)isomeric structures
C)polar structures
D)liquid structures
9
In the Lewis structure for the polyatomic ion SO42-, how many lone pairs of electrons surround each oxygen atom?

H2SO4 yields 2H+(aq) + SO42-(aq)
A)1
B)2
C)3
D)4
10
What hybridization is present in an octahedral molecular geometry?

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A)sp2
B)sp3
C)sp3d
D)sp3d2
11
Why does the lone pair in the trigonal pyramidal molecular shape take up more space than the other three shared pairs?

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A)The lone pair contains more electrons.
B)There is stronger repulsion between the lone pair and the bonding pairs than between two bonding pairs.
C)The lone pair has a greater mass.
D)There is less repulsion between the lone pair and the bonding pairs than between two bonding pairs.
12
What is the hybridization in the tetrahedral molecular shape?

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A)sp
B)sp2
C)sp3
D)Sp3d
13
Which element has the highest electronegativity?
A)N
B)O
C)F
D)Ne
14
Nitrogen has an electronegativity of 3.04, oxygen an electronegativity of 3.44. Where on the graph would the molecule NO be found?

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A)Between HCl and AlP
B)Between AlP and N2
C)Between HF and HCl
D)Between CaO and MgO
15
Carbon has an electronegativity of 2.55, oxygen an electronegativity of 3.44. What is the bond character of CO?

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A)mostly ionic
B)polar covalent
C)mostly covalent
D)nonpolar covalent
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