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Materials

Materials. One per person: Rulers Scissors COACH book. Creating your foldable. Fold your paper in half “hot dog” style. Draw 7 lines 1.5 inches apart. Cut along the line one the OUTSIDE fold ONLY making 8 tabs. Vocabulary. Polarity Surface Tension Cohesion Adhesion.

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Materials

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  1. Materials One per person: • Rulers • Scissors • COACH book

  2. Creating your foldable • Fold your paper in half “hot dog” style. • Draw 7 lines 1.5 inches apart. • Cut along the line one the OUTSIDE fold ONLY making 8 tabs.

  3. Vocabulary • Polarity • Surface Tension • Cohesion • Adhesion • Universal Solvent • Buoyancy • Specific Heat Use COACH pages 132-135 to find the definitions.

  4. In your notebook… • At the top of page 11, write: PROPERTIES OF WATER • Fold your foldable in half (long-way) and tape into your notebook.

  5. Sinkin’ Lincoln Materials: 2 pennies, 2 medicine droppers, water, and soap water. Directions: • Predict the number of drops of water you can drop on the penny. • Using the medicine dropper, drop as many drops of plain water on the surface of a clean dry penny. Record the number of drops that the penny held before overflowing. • Look at the penny from the side. Make a sketch of the penny with water on it. • Predict the number of drops of soapy water you can drop on the penny. • Using the other medicine dropper, drop as many drops of soapy water on the 2nd clean dry penny. Record the number of drops that the penny held before overflowing. • Look at the penny from the side. Make a sketch of the penny with water on it. Cleanup: Dry the pennies. Clean up any spills. Pour out the SOAPY WATER and throw away the cup. DO NOT throw away the clear cups nor pour out the water. Return SOAPY WATER PIPETS to the cup and leave the PLAIN WATER PIPETS in the cup.

  6. Sinkin’ Lincoln Analysis: • Surface tension is created by forces between molecules. Are the forces cohesive or adhesive? Explain your answer. • What did the soap do to the surface tension of the water? Explain your answer. • How does surface tension explain the pain a swimmer feels when he jumps off the diving board and does a belly buster?

  7. Water, The Universal Solvent In your own words, define: (HINT: Think back to chemistry!) SOLUTE SOLVENT SOLUTION

  8. Water, The Universal SolventWill the substance dissolve in water?

  9. Water, The Universal Solvent • Did all of the substances dissolve in water? If no, which substances did not dissolve in water? • Water is a polar molecule. What does this mean? • What can we determine about the polarity of the substances based on the solubility of each substance? • Does water’s polarity help it to act as a universal solvent? Why or why not? • How does water’s ability to be a universal solvent help us in our everyday life?

  10. Passengers in a Boat Materials: • Metric ruler • Calculator • Foil • Balance Beam • Tub of water

  11. Passengers in a Boat Directions: • Use the piece of aluminum foil to create a boat. • Measure the mass of your boat. Record the mass in the data table. • Fill your water container (a beaker or plastic shoebox) 2/3 full of water. Place your boat on the water to see if it will float. If the boat does not float, reshape the boat until you can get it to float. • Make a sketch of your boat. • Measure the mass of one penny. Record the mass in the data table. • Estimate the maximum number of pennies that your boat will hold. • Add pennies to your boat one at a time until the boat sinks (be sure not to place all pennies in one location). Record the number of pennies the boat held before sinking. • Remove the pennies and the boat. Dry them. • Multiply the mass of one penny by the maximum number of pennies that will allow the boat to remain floating. Record this number in the data table. Cleanup: Dry all materials. Clean up any water spills.

  12. Passengers in a Boat Analysis: (no need to write the question, answer in complete sentences) • What is buoyancy and how does it relate to this lab? • Does the mass of the boat affect the buoyancy? Why or why not? • How are the concepts of buoyancy and density used to design boats that will float on water?

  13. Polarity (VIDEO) Discovery Streaming Simply Science: Water’s Structure Segment: The Shape of Water (3:28)

  14. Surface Tension a force that acts on the particles at the surface of a liquid • Complete the handout with a partner. • Tape this on the LEFT side of your notebook • Label the RIGHT side of your notebook SURFACE TENSION • Answer the following question in a complete sentence: How can we make a paper clip float on top of a glass of water?

  15. Surface Tension • Carefully place one paper clip at a time on the surface of the water. • Answer the following questions in complete sentences in your notebook. Skip a line after the last question and between each of these questions. • Can more than one float at the same time? If so, how many? • What happens to the paper clips if the surface tension breaks? • Draw a picture of what you observed. • Explain what surface tension is in your own words and what you learned from today’s activity.

  16. Cohesion and Adhesion Cohesion the tendency of water molecules to form weak bonds and stick together Adhesion the tendency of water to stick to other substances

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