Polarity

1
Unit 4

• Polarity
• Which of these substances ispolar or non-polar?
• H2O Ca(OH)2 C6H6
• Oil C2H5OH C17H35COOH

2

• Polarity results from unequal sharing of
  electrons
• In H2O
• H O H
• Bond angles?
• 104.5º

3
Water
4
Arrange 3 waters
5
Circle partial positive (d) and square partial
negative(d-)
6
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7
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8

• Acetic acid and water

9

• Ethanamine and water

H
H
H
C
H
C
N
H
H
H
10
Ions dissolving in water
11
Non-polar substances (hydrophobic attractions)

• Square non-polar portions and label partial
  charges in
• Longer hydrophobic chains ? stronger
  interactions. (goal is to cluster AWAY from
  water.)

d-
d-
d
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13
Hydrophobic Interactions
14
Polar Head
Nonpolar Tails
15
Phospholipids cluster to make membranes
16
Label

• Polar head groups
• Aqueous Environment
• Hydrophobic groups