Life depends on the unique properties of water - PowerPoint PPT Presentation

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Life depends on the unique properties of water

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Ex: Water strider; movement of water through the trunks of tall trees. Adhesion ... Measure of the average energy of random motion of the particles in a substance ... – PowerPoint PPT presentation

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Title: Life depends on the unique properties of water


1
Life depends on the unique properties of water
  • Concept 4.4

2
Polarity of Water and H bonds
3
Cohesion
  • COHESION means to stick together
  • Ex Water strider movement of water through the
    trunks of tall trees.

4
Adhesion
  • Water molecules are also attracted to certain
    other molecules

5
(No Transcript)
6
Temperature Moderation
  • Thermal Energy
  • The total amount of energy associated with the
    random movement of atoms and molecules
  • Temperature
  • Measure of the average energy of random motion of
    the particles in a substance
  • Example - sweating

7
Low Density of Ice
8
Ability to dissolve other substances
  • SOLUTE - Dissolved substance.
  • SOLVENT - Dissolving substance.

9
pH
  • Acid - A compound that releases hydrogen ions
    (H) in water
  • Base - A compound that produces hydroxide ions
    (OH-) in water.
  • The degree of acidity or alkalinity is called the
    pH scale

10
pH Scale
11
Buffers
  • Substances that cause a solution to resist
    changes in pH
  • Example Blood cells
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