Chemistry: Matter and Change

Chapter 8: Covalent Bonding

Chapter Test Practice

1
Hydrogen gains stability as the H2 molecule by forming the noble-gas configuration of ________.

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A)oxygen
B)helium
C)neon
D)xenon
2
What is the number of electrons in each of the molecules shown in the diagram?

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A)5
B)6
C)7
D)8
3
Explain why HCl is hydrochloric acid while HClO3 is chloric acid.
A)Chloric acid contains no hydrogen.
B)Chloric acid does not dissolve in water.
C)Chloric acid contains oxygen, and so is an oxyacid. Hydrogen in an oxyacid is not part of the name.
D)HCl is more commonly used, and so it is given the name hydrochloric acid over the less common HClO3
4
What is the correct name for HBr in an aqueous solution?

Binary Molecular Compound

Binary Acid

Contains only two different elements

Contains hydrogen and one other element

Second element uses name + -ide

Uses hydro + root of second element + -ic and acid


A)hydrobromic acid
B)hydrogen bromide
C)bromic acid
D)bromous acid
5
Of the models displayed, which shows all the valence electrons?

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A)molecular formula
B)space-filling model
C)Lewis structure
D)structural formula
6
In a coordinate covalent bond, ________.

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A)one atom donates both electrons to the bond.
B)each atom donates one electron to the bond.
C)atoms form a double bond.
D)atoms share more than one pair of electrons.
7
What hybridization is present in an trigonal bipyramedal molecular geometry?

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A)sp2
B)sp3
C)sp3d
D)sp3d2
8
In the trigonal planar molecular geometry, how many unshared pairs are present around the central atom?

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A)0
B)1
C)2
D)3
9
Hydrogen has an electronegativity of 2.20, fluorine an electronegativity of 3.98. What sort of bond do they form?

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A)mostly ionic
B)polar covalent
C)mostly covalent
D)nonpolar covalent
10
Which of the following properties does not refer to covalent network solids?

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A)brittle
B)hard
C)good conductors of heat
D)non-conductors of electricity
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