Properties of Water - McAven Science.ppt

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					             Properties of Water
 What are some characteristics that make you different
  from everybody else? Maybe you can play basketball
really well, or have a freckle on the tip of your elbow, or
maybe you can draw better than anybody else you know.

It may seem strange, but each substance in the world has
 special characteristics that make it different from every
 other substance. Just like you, they have characteristics,
 or properties, that make them unique. Believe it or not,
   water has some of the most unique properties of all!
                       VOGO
Side 1                      Side 2
                            • Example
WORD                        • Picture
• Definition                • Sentence


                             Where can I find these words?
         Words:              Chapter 2 (pg. 44)


                              Density
         Adhesion
                              Polarity
         Buoyancy
                              Specific Heat
         Capillary Action
                              Surface Tension
         Cohesion
                              Universal Solvent
                      ADHESION
Definition:
• the ability of water molecules to attract to other
  substances.
     • Because water molecules are polar (having one positive end
       and one negative end) they attract other substances.
Example:
• raindrops sticking to a window or glass
• water sticking to paper towel
                 BUOYANCY
Definition:
• the ability of an object to float in water.


Example:
• floating in the ocean or a pool
• a boat
          CAPILLARY ACTION
Definition:
• the process that moves water through a
  narrow porous space

Example:
• water moving up a straw
• water moving up a plant stem
                  COHESION
Definition:
• the ability of water molecules to attract
  towards each other.
  – Because water molecules are polar (having one
    positive end and one negative end), they attract
    each other.
Example:
• water “dome”
• rain drops
                  DENSITY
Definition:
• the measure of mass of a substance per unit
  volume

Example:
• ice floating on water
                     POLARITY
Definition:
• when one molecule has opposite charges on each
  of its ends (one end is slightly positive, the other
  end is slightly negative).
Example:
Water (H2O) is a polar molecule because its hydrogen end is
 slightly positive and its oxygen end is slightly negative.
                          Specific Heat
• The amount of energy it takes to raise the
  temperature of a substance by one degree
  Celsius
• Water has a very high specific heat.

•   This means that compared to other substances, it takes a big change in
    energy to change the temperature of water.


• Example: The ocean does not drastically
  change temp.
            SURFACE TENSION
Definition:
• the force that acts on the particles at the
  surface of a material

Example:
• Water striders (bugs)
• painful belly flop
              UNIVERSAL SOLVENT
• Water is called the “universal solvent”


Definition:
  • this means that water can dissolve more things than any
    other substance.
Example:
  • water can dissolve: soap, sugar, salt, toothpaste, baking
    soda, etc.
                  Acting it out
• Students will be divided into pairs.
• Each pair will be given one of the properties of
  water to “act out.”


        Words:

        Adhesion           Density
        Buoyancy           Polarity
        Capillary Action   Specific Heat
        Cohesion           Surface Tension
                           Universal Solvent
              Assessment Statements
•    The water is sticking to the side of the glass.
     adhesion
2.   Water droplets combine together in the atmosphere to
     make rain drops.
     cohesion
3.   Salt dissolves in water.
     universal solvent
4.   When I dropped a rock in the river, it sank.
     buoyancy
5.   On the coast in the summer, the ocean takes a lot longer
     to heat up than the air and land.
     specific heat
6.   Water molecules have a positive end and a negative end.
     polarity
•   The suction cup will only stick to the window if I wet it first.
•   My mom used water to make Gatorade for the team. All of the
    powder dissolved completely in water.
•   Water striders are able to walk on water without sinking.
•   I tried to mix the oil with the water, but no matter what I did the
    two liquids would not mix.
•   The window was covered in rain. As the rain ran down the
    window, the drops came together to make larger drops of water.
•   Gina’s doctor suggested that she join a water aerobics class for
    exercise to keep from re-injuring her knee. He told her that the
    water takes the pressure off of her knee.
•   The paper towel soaked up the spill in a jiffy.
•   The log floated down the river.
•   The blue dye in the water traveled up to the petals of the white
    flower.
•   An iceberg floats on water in the Artic.

				
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posted:2/20/2014
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