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01 17-2012-lesson


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01 17-2012-lesson

  1. 1. Conclusions – page 101 <ul><li>Surface Tension: the tendency of a liquid to reduce its surface </li></ul><ul><li>If the number of paperclips was very different from your prediction, explain what accounts for the difference? </li></ul><ul><li>Explain your results in terms of surface tension. </li></ul><ul><li>How do insects walk on water? </li></ul>
  2. 2. Density of Water - Page 102 Observing Floating Ice <ul><li>Materials: </li></ul><ul><ul><li>Ice cube </li></ul></ul><ul><ul><li>Cup of Water </li></ul></ul><ul><li>Procedures: </li></ul><ul><ul><li>Obtain an ice cube. </li></ul></ul><ul><ul><li>Place it in the cup of water. </li></ul></ul><ul><ul><li>Note the proportion of the ice cube that is above the water. </li></ul></ul>
  3. 3. Density of Water: - page 103 Observing Floating Ice <ul><li>Results </li></ul><ul><ul><li>How much of the ice cube was above water? </li></ul></ul><ul><ul><li>Why does ice float? Use density in your explanation. </li></ul></ul><ul><ul><li>How would life in a lake be affected if ice sank and lakes froze from the bottom up? </li></ul></ul>
  4. 4. Capillarity of Water – page 104 <ul><li>Question: How far will water travel up a strip of paper? </li></ul><ul><li>Materials: </li></ul><ul><ul><li>Strip of paper towel </li></ul></ul><ul><ul><li>Ruler </li></ul></ul><ul><ul><li>Cup of Water </li></ul></ul><ul><ul><li>Timer </li></ul></ul><ul><ul><li>Pencil </li></ul></ul>
  5. 5. Capillarity of Water <ul><li>Procedures: </li></ul><ul><ul><li>Obtain a strip of paper towel. </li></ul></ul><ul><ul><li>Wrap the paper towel around the pencil so that it is the same height as the cup. </li></ul></ul><ul><ul><li>Place 2 cm of water in the cup. </li></ul></ul><ul><ul><li>Place the pencil above the cup so that the water just touches the edge of the paper towel. </li></ul></ul><ul><ul><li>Note how far the water has traveled every two minutes. </li></ul></ul>
  6. 6. Capillarity of Water <ul><li>Results: </li></ul><ul><li>Distance Traveled </li></ul>Time (minutes) Distance (cm) 2 4 6 8 10
  7. 7. Capillarity of Water <ul><li>Analysis: </li></ul><ul><ul><li>Create a graph for your results. </li></ul></ul><ul><li>Discussion: </li></ul><ul><ul><li>Explain how the properties of water enabled the water to move up the paper. </li></ul></ul><ul><ul><li>How does water move from the roots to the top leaves of an oak tree? </li></ul></ul><ul><ul><li>Explain how the properties of water are important to living organisms. </li></ul></ul>