1. 0:56
0:55
0:54
0:53
0:57
0:58
1:02
1:01
1:00
0:59
0:52
0:51
0:44
0:43
0:42
0:41
0:45
0:46
0:50
0:49
0:48
0:47
1:03
1:04
1:19
1:18
1:17
1:16
1:20
1:21
1:25
1:24
1:23
1:22
1:15
1:14
1:08
1:07
1:06
1:05
1:09
1:10
1:13
1:12
1:11
0:40
0:39
0:09
0:08
0:07
0:06
0:10
0:11
0:15
0:14
0:13
0:12
0:05
0:04
0:00
0:00
0:00
0:00
0:00
0:00
0:03
0:02
0:01
0:00
0:16
0:17
0:32
0:31
0:30
0:29
0:33
0:34
0:38
0:37
0:36
0:35
0:28
0:27
0:21
0:20
0:19
0:18
0:22
0:23
0:26
0:25
0:24
1:26
1:27
2:30
2:29
2:28
2:27
2:31
2:32
2:36
2:35
2:34
2:33
2:26
2:25
2:18
2:17
2:16
2:15
2:19
2:20
2:24
2:23
2:22
2:21
2:37
2:38
2:53
2:52
2:51
2:50
2:54
2:55
2:59
2:58
2:57
2:56
2:49
2:48
2:42
2:41
2:40
2:39
2:43
2:44
2:47
2:46
2:45
2:14
2:13
1:43
1:42
1:41
1:40
1:44
1:45
1:49
1:48
1:47
1:46
1:39
1:38
1:31
1:30
1:29
1:28
1:32
1:33
1:37
1:36
1:35
1:34
3:00
1:50
2:06
2:05
2:04
2:03
2:07
2:08
2:12
2:11
2:10
2:09
1:51
2:02
1:55
1:54
1:53
1:52
2:01
1:56
2:00
1:57
1:59
1:58
Hw: Take home quiz Review book pg 62 #’s Skip #’s 6,8,12,16, Questions and answers must be written to receive credit. Late quizzes are a Zero
Do Now
Determine the type of bonding in the following molecules: KF I2 HF

2. A Question of Shape and Bond Type
Polar Molecules
A Question of Shape
and Bond Type

3. Electronegativity Difference
Sample Molecules
Consider the following molecules:
HCl
CCl4
H2O
CO2
CS2
Steps to determine if a molecule is polar or nonpolar
First determine their bond types.
If a molecule has nonpolar bonds, it can’t be a polar molecule.
Molecule
Electronegativity
Electronegativity Difference
Metal
Nonmetal
HCl
CCl4
H2O
CO2
CS2
Polar
Polar
2.1
3.2
1.1
2.6
3.2
0.6
Polar
2.1
3.4
1.3
Polar
2.6
3.4
0.8
Nonpolar
2.6
2.6
0.0
WRITE
DOWN

4. Electron Dot Diagrams . . . . Draw electron dot diagrams
WRITE
DOWN
Draw electron dot diagrams
HCl,
CCl4 ,
H2O, and
CO2 .
The electron dot diagram gives you some idea of the shape of the molecule. . Cl C H . Cl . O C H . O
WRITE
DOWN

5. The Shape of the Molecules
HCl
CCl4
H2O
CO2

6. Charge Distribution
WRITE
DOWN
The electronegativity tells the relative charge of each atom.
HCl
CCl4
H2O
CO2
The more electronegative atom is slightly negative. + −
Molecule
Electronegativity
Metal
Nonmetal
HCl
CCl4
H2O
CO2 − − + −
2.6
2.1
3.2
3.4 − − + + + − −
WRITE
DOWN

7. Symmetry and Polarity × × × × × × × × × polar nonpolar polar nonpolar
WRITE
DOWN
If the charge is distributed asymetrically, the molecule is polar.
If a dividing line can separate the regions of positive and negative charge, the charge is distributed asymetrically. The molecule is polar
HCl
CCl4
H2O
CO2 × ×
polar − + × + −
nonpolar × × × ×
polar − + × − +
nonpolar ×