Covalent Bonding Chemistry Worksheet With Answers Page 6
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6Standardized Test Prep
Standardized Test Prep
1. c
Explain why the arrangement of electron pairs is
7.
2. d
Test-Taking Tip
tetrahedral in each molecule.
3. b
Connectors Sometimes two phrases in a true/
8.
H
S has two hydrogen atoms bonded to a sulfur
2
4. a
false question are connected by a word such as
atom. Why isn’t the molecule linear?
5. c
because. The word implies that one thing caused
What is the arrangement of electron pairs in PBr
?
9.
3
6.
another thing to happen. Statements that
H
Cl
Predict the molecular shape of a PBr
molecule.
3
include such words can be false even if both
H
C
H
Cl
N
Cl
H
S
H
H F
For Questions 10–12, identify the type of intermolecu-
H
parts of the statement are true by themselves.
lar bonding represented by the dotted lines in the
7. Each central atom has four pairs of
drawings.
electrons that, according to VSEPR
Select the choice that best answers each question or
H
O
10.
2
theory, assume a tetrahedral
completes each statement.
shape.
A bond in which two atoms share a pair of
1.
electrons is not
8. The two nonbonding pairs repel
a coordinate covalent bond.
a.
the bonding pairs; there are still
a polar covalent bond.
b.
four pairs of electrons around the
c.
an ionic bond.
BrCl (bromine chloride)
11.
sulfur atom.
d.
a nonpolar covalent bond.
9. The arrangement of electron pairs
How many valence electrons are in a molecule of
2.
phosphoric acid, H
PO
?
is tetrahedral. The electron dot
3
4
7
16
24
32
a.
b.
c.
d.
structure shows three bonding
3.
Which of these molecules can form a hydrogen
electron pairs and one non-bond-
bond with a water molecule?
ing electron pair; thus, the pre-
a.
N
b.
NH
c.
O
d.
CH
2
3
2
4
dicted molecular shape is
Which substance contains both covalent and
4.
pyramidal.
ionic bonds?
NH
NO
CH
OCH
LiF
CaCl
a.
b.
c.
d.
10. hydrogen bonding
CH
OH (methanol)
12.
4
3
3
3
2
3
5.
Which of these bonds is most polar?
11. primarily dispersion forces
a.
H⎯Cl
b.
H⎯Br
c.
H⎯F
d.
H⎯I
12. hydrogen bonding
Use the description and data table below to answer
13. True, True
Questions 6–9.
14. False, True
The table relates molecular shape to the number
15. True, False
of bonding and nonbonding electron pairs in
In Questions 13–15, a statement is followed by an
molecules.
explanation. Decide if each statement is true and
then decide if the explanation given as correct.
Non-
Arrangement
Bonding
bonding
of electron
Molecular
A carbon monoxide molecule has a triple cova-
13.
pairs
pairs
pairs
shape
Example
lent bond because carbon and oxygen atoms
4
0
tetrahedral
tetrahedral
CH
4
have an unequal number of valence electrons.
3
1
tetrahedral
pyramidal
NCl
3
Xenon has a lower boiling point than neon
14.
2
2
tetrahedral
bent
H
S
2
because dispersion forces between xenon atoms
1
3
tetrahedral
linear
HF
are stronger than those between neon atoms.
The nitrate ion has three resonance
15.
Draw the electron dot structure for each exam-
6.
structures because the nitrate ion has three
ple molecule.
single bonds.
251
Standardized Test Prep
Covalent Bonding
251
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