01 17-2012-lesson

Conclusions – page 101
Surface Tension: the tendency of a liquid to reduce its surface
If the number of paperclips was very different from your prediction, explain what accounts for the difference?
Explain your results in terms of surface tension.
How do insects walk on water?

Density of Water - Page 102 Observing Floating Ice
Materials:
Ice cube
Cup of Water
Procedures:
Obtain an ice cube.
Place it in the cup of water.
Note the proportion of the ice cube that is above the water.

Density of Water: - page 103 Observing Floating Ice
Results
How much of the ice cube was above water?
Why does ice float? Use density in your explanation.
How would life in a lake be affected if ice sank and lakes froze from the bottom up?

Capillarity of Water – page 104
Question: How far will water travel up a strip of paper?
Materials:
Strip of paper towel
Ruler
Cup of Water
Timer
Pencil

Capillarity of Water
Procedures:
Obtain a strip of paper towel.
Wrap the paper towel around the pencil so that it is the same height as the cup.
Place 2 cm of water in the cup.
Place the pencil above the cup so that the water just touches the edge of the paper towel.
Note how far the water has traveled every two minutes.

Results:
Distance Traveled
Time (minutes) Distance (cm) 2 4 6 8 10

Analysis:
Create a graph for your results.
Discussion:
Explain how the properties of water enabled the water to move up the paper.
How does water move from the roots to the top leaves of an oak tree?
Explain how the properties of water are important to living organisms.

01 17-2012-lesson

by Janelle Wilson on Jan 18, 2012

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01 17-2012-lesson — Presentation Transcript