Weird Water Properties Answer Key
1. Frozen water or ice is
unusual in that it _floats liquid water.
Water vapor is : more
These two abnormalities make our planet habitable and its weather
paterns so intricate.
"Water is an apparently simple molecule (H2O) with a highly
complex character. As a gas it is one of lightest known,
as a liquid it is much denser than
expected and as a solid it is much lighter than
from "Water Structure and Science" by
is known as the universal
Toy for scientists... no seriously the answer is Solvent.
(Although, ice is
relatively poor as a solvent and freezing water can be used to purify
From Wikipedia, the free encyclopedia
The Universal Solvent may refer to:
can take a peek at this intriguing article: The most "Universal Solvent"
Finally, water at higher pressures and temperatures can disolve
4. At four
degrees centigrade (4°
C) water expands on Both warming and cooling
This explains why our planet is not a just a ball of ice, but as you
can imagine ii makes modeling water difficult.
Hot and cold water have
different properties. Which of these is NOT true:
as cold liquid water is
A . the speed
within it increases true, which should
be the reverse
conducts heat better true also very odd
C. gasses become
liquid water is heated:
D. it shrinks false
it expands (cold water can shrink when heated see question 4)
E. it becomes
easier to compress true
"As cold liquid water is heated it shrinks, it
becomes less easy to compress,
index increases, the speed of sound
within it increases, gases become less soluble
and it is easier to heat
and conducts heat
better. In contrast as hot liquid water is heated it expands, it
becomes easier to compress,
index reduces, the speed of sound
within it decreases, gases become more soluble
and it is harder to heat
and a poorer conductor of heat.
With increasing pressure, cold water molecules move faster
but hot water molecules move slower.
again from "Water Structure and Science" by
Viscosity measures a fluid's
internal flow resistance. Water flows relatively easily in comparison
to olive oil.
C , what happens to water's
viscous flow as pressure increases? It:
B. Becomes even
lower than normal
Which is unusual since
normally under pressure most liquids begin to act more like solids. See
and his colleagues in South Korea ran across Warm Ice
or frozen water at room temperature, serendipitously. What had they inadvertently done to crystalize water
at their ambient
couple of million or so volts to the sample with a scanning
tunneling microscope (STM).
8. In stratiform
and cumulus clouds,
airplanes often run into this form of water which consequently causes
problems with lift.
a ice cube. Obviously,
when the temperature increases it melts. However, it is possible
to liquefy water ice without
changing the temperature by:
Increasing the atmospheric pressure.
10. This means it is very
hard to heat up. In
what phase does water have the highest specific heat, twice as high as
its other forms?
Most people have seen broken water pipes caused
by subzero temperatures. So they know that water unlike most other
liquids expands when frozen. How would increasing atmospheric pressure
affect the ratio of the expanded ice to original liquid form?
Freezing water at one bar increases its volume by
aproximately 9 percent. However, counter intuitively, when the
pressure is increased, say to 200 MPa and hence lowering the freezing
temperature to -20 C, water then expands by almost 17% in
Ask your students if this following statement is true or what they think about it.
the water that will ever be is,
Some water demostrations
"National Geographic, October 1993
|The atraction of water molecules
Needed: ping pong
Place two dry ping pong balls next to each other. Move one ball away.
The other ball will remain in place.
Next , wet the balls repeat experiment. The balls should move in tandem.
|Static charge and ionized water.
and a wter tap or faucet.
Turn on a small stream of water in the sink. Bring the balloon near.
Nothing should happen. Now charge the balloon with say the hair on your
head. Repeat. Note:If you use distilled water you should see no difference from the charged nd uncharged balloon
Needed:a petri dish
& stand, small laser, water and a very strong magnet. Aim the
laser at very oblique angle at the water suface so that it almost
skims the water. Place the magnet under the dish. Normally, this should
change the surface of the water and thus the trajectory of the laser
beam. Becareful to avoid vibrations and hence waves.
|Melting ice on the water level in a glass.
glass, water and ice.
no mater how many times I see this simple demonstration I
am always amazed at the result. First half fill a glass of water, add
ice, draw a line at the water level. Wait till the ice has melted. You
may ask the class where they think the water level will be when
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