properties of water lab what happened in this lab?
TRANSCRIPT
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Properties of Water Lab
What happened in this lab?
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Station One
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Penny & Water
Properties shown:
• Adhesion: Water sticks to the penny:
• Cohesion: Water sticks to water to
give the bubble effect and allow so
much water to fit in a tiny space.
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Station Two
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Wax Paper & Water & OilProperties of water shown:
• Water is polar and wax is nonpolar (remember like
only dissolves like) so the water just sits on the wax
paper like a bead, when you drag them together
they form a big bubble (cohesion: water sticking to
water)
• Oil is non-polar and so is wax, like dissolves like, so
the oil dissolves through the paper, does not show
the same properties as the water.
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Station Three
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Paper Clip in Water & Add Soap
Properties of water shown:
Paper clip floats because cohesion (water
sticking to water) allows for surface tension
to form.
Paper clip sinks because the soap is non-
polar and breaks the hydrogen bonds in
water. (no more surface tension).
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Station Four
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Ice in Water & Alcohol
Properties of water shown:
• Ice floats in water because it is less dense than water.
• Ice sinks in alcohol because it is more dense than
alcohol.
• Fish can survive in the water because ice floats in
water and insulates the bottom of the pond. (high
specific heat: hydrogen bonds resist extreme changes
in temp).
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Station Five
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Capillary Tube & Red Water
Properties of water shown:
Adhesion: The water rises up in the tube by
sticking to the sides of the tube. This is how a
tree moves water from the ground to its
leaves.
Cohesion: As the water sticks to the sides of
the tube, it pulls more water with it
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Station Six
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Water & Alcohol with Sugar & Salt
Properties of water shown:
Water is a solvent and it is polar so it
dissolves the sugar and the salt very well.
Alcohol is less polar than water so it is not
as good as a solvent as water is, so the
solutes do not dissolve in alcohol.