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Unique Properties of
WaterMrs. McAven
8th Grade ScienceRiverwood Middle School
The Properties of WaterCH.2 section 1•Read pgs. 46-51•On page 51 answer #’s 1-3 (ALL) in complete sentences.
CH. 2 section 2•Read pgs. 52-57•On page 57 answer #’s 1-2 (ALL) in complete sentences.
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!
VOGOSide 1
WORD• Definition
Side 2
• Example/Sentence• Picture
Words:
AdhesionBuoyancyCapillary ActionCohesion
Density PolaritySpecific HeatSurface TensionUniversal Solvent
Where can I find these words? Chapter 2 (pg. 44)
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:
AdhesionBuoyancyCapillary ActionCohesion
Density PolaritySpecific HeatSurface TensionUniversal Solvent
Assessment Statements1. The water is sticking to the side of the glass.
adhesion2. 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. density
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
1. The suction cup will only stick to the window if I wet it first.2. My mom used water to make Gatorade for the team. All of the
powder dissolved completely in water.3. Water striders are able to walk on water without sinking.4. I tried to mix the oil with the water, but no matter what I did the
two liquids would not mix.5. The window was covered in rain. As the rain ran down the
window, the drops came together to make larger drops of water.6. 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.
7. The paper towel soaked up the spill in a jiffy.8. The log floated down the river.9. The blue dye in the water traveled up to the petals of the white
flower.10. An iceberg floats on water in the Artic.
Water Properties Practice
Unique Properties of Water Mini Labs
1. Sink’n Lincoln2. Water bug3. Water Rope4. Iceberg5. Shipwreck
Sink’n Lincoln1. Predict how many drops of water you
can fit on a penny.
2. What was the actual number of drops you could fit on the penny?
3. What property of water allowed you to fit that many drops on the penny?
Water bug4. A paper clip is not lighter than water, yet it can stay on top of the water. Explain why this is.
5. Explain what the soap did to the surface tension of the water.
Water Rope
6. What is capillary action? How does this help plants?
Iceberg7. Why does ice float on top of water?
8. Rank the densities of the liquids from most dense to least dense.
9. If water’s density is 1.0 g/mL, what can be determined about the other liquids’ densities in the column?
Ship Wreck10. Does the density of the boat affect the buoyancy?
Buoyancy and the Titanic MythBusters: Water Displacement
How Stuff Works: WATER1.What is a dipole? How does water’s dipole molecular
structure affect its properties?2.Why is water essential to life on earth? Why do scientists
credit water with allowing life to form?3.How do plants transport water from the roots to the
leaves?4.How does the Hoover Dam generate electricity? What are
the environmental drawbacks of damming a river?5.Why does water resist compression?6.What is cloud seeding? How does cloud seeding encourage
rainfall?
How Stuff Works: WATER