Name
Date
Chemistry – ___
Notes Chapter 8 Study Guide
1.
Know all vocabulary from Chapter 8.
2.
The electrons involved in the formation of a chemical bond are called: valence electrons
3.
The electrostatic attraction between positively charged nuclei and negatively charged electrons permits two atoms to be held together by a(n) : chemical bond
4.
If two covalently bonded atoms are identical, the bond is: nonpolar covalent
5.
In which of these compounds is the bond between the atoms NOT a nonpolar covalent bond? a.
I
2 c.
Cl
2 b.
HBr
6.
To draw a Lewis structure, it is necessary to know: d.
O
2
______________________
______________________
______________________
7.
The substance whose Lewis structure shows three covalent bonds (not a triple bond) is: a.
H
2
O. b.
BH
3
. c.
d.
CF
CH
2
4
Cl
.
2
.
8.
According to VSEPR theory, the electrostatic repulsion between electron pairs surrounding an atom causes: a.
an electron sea to form. b.
positive ions to form. c.
these pairs to be separated as far as possible. d.
light to reflect.
9.
According to VSEPR theory, the structure of the PH
3
, is: trigonal pyramidal.
10.
What causes the high temperature necessary to boil water? hydrogen bonding.
11.
When the molecules H
2
O, CH
4
, and NH
3
are arranged in order of increasing bond angle, the correct sequence is: a.
H
2
O, CH
4
, NH
3 b.
H
2
O, NH
3
, CH
4 c.
NH
3
, H
2
O, CH
4 d.
CH
4
, NH
3
, H
2
O
12.
Which of the following molecules has the smallest angle between adjacent bonds? a.
CO
2 b.
CCl
4 c.
d.
H
2
S
NH
3
13.
Which of the following molecules or ions is nonplanar, i.e., has at least one atom that is not in the same plane as the others? a.
BF
3 b.
BeH
2 c.
d.
NH
SO
3
3
14.
Identify the molecular geometry of CF
2
O. a.
linear b.
trigonal planar c.
bent d.
15.
The electronegativity difference between hydrogen and carbon is: tetrahedral a.
1.6 b.
4.1 c.
3.5 d.
0.4
16.
Which element is most electronegative? a.
H b.
C
17.
Honors, only: What is the hybridization of the carbon in CH
4
? c.
F d.
Cl a.
b.
s sp c.
sp 2 d.
sp 3
18.
Honors, only: What is the hybridization of the sulfur in SH
4
? a.
sp b.
sp 2 c.
sp d.
sp
3
3 d d 2

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1.
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2.
Handouts
3.
Assignments
4.
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5.
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A couple of images that may help you to clarify concepts: ionic vs. non-polar covalent vs. polar covalent
+
-

Answers
1.
Know all vocabulary from Chapter 8. Done! ;)
2.
The electrons involved in the formation of a chemical bond are called: valence electrons
3.
The electrostatic attraction between positively charged nuclei and negatively charged electrons permits two atoms to be held together by a(n) : chemical bond
4.
If two covalently bonded atoms are identical, the bond is: nonpolar covalent
5.
In which of these compounds is the bond between the atoms NOT a nonpolar covalent bond? a.
I
2 c.
Cl
2 b.
HBr
7.
To draw a Lewis structure, it is necessary to know: d.
O
2
the types of atoms in the molecule.
the number of valence electrons for each atom.
the number of atoms in the molecule.
7.
The substance whose Lewis structure shows three covalent bonds (not a triple bond) is: a.
H
2
O. b.
BH
3
. c.
CF
2
Cl
2
. d.
CH
4
.
8.
According to VSEPR theory, the electrostatic repulsion between electron pairs surrounding an atom causes: a.
an electron sea to form. b.
positive ions to form. c.
these pairs to be separated as far as possible. d.
light to reflect.
9.
According to VSEPR theory, the structure of the PH
3
, is: trigonal pyramidal.
10.
What causes the high temperature necessary to boil water? hydrogen bonding.
11.
When the molecules H
2
O, CH
4
, and NH
3
are arranged in order of increasing bond angle, the correct sequence is: a.
H
2
O, CH
4
, NH
3 b.
H
2
O, NH
3
, CH
4 c.
NH
3
, H
2
O, CH
4 d.
CH
4
, NH
3
, H
2
O
12.
Which of the following molecules has the smallest angle between adjacent bonds? a.
b.
CO
CCl
2
4 c.
H
2
S d.
NH
3
13.
Which of the following molecules or ions is nonplanar, i.e., has at least one atom that is not in the same plane as the others? a.
b.
BF
3
BeH
2 c.
NH
3 d.
SO
3
14.
Identify the molecular geometry of CF
2
O. a.
linear c.
bent b.
trigonal planar d.
15.
The electronegativity difference between hydrogen and carbon is: tetrahedral a.
1.6 b.
4.1 c.
3.5 d.
0.4
16.
Which element is most electronegative? a.
H b.
C
17.
Honors, only: What is the hybridization of the carbon in CH
4
? c.
F d.
Cl a.
s b.
sp c.
sp 2 d.
sp 3
18.
Honors, only: What is the hybridization of the sulfur in SH
4
? a.
sp b.
sp 2 c.
sp d.
sp
3
3 d d 2