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February 7

February 7. Water Lab Make-Up. Instructions. Follow the PowerPoint Click on the links to see the video demo for each topic Answer the questions Try some of these at home, if you can. . Properties of Water. Important Terms: Capillary Action Heat Capacity Polarity Adhesion Cohesion.

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February 7

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  1. February 7 Water Lab Make-Up

  2. Instructions • Follow the PowerPoint • Click on the links to see the video demo for each topic • Answer the questions • Try some of these at home, if you can.

  3. Properties of Water • Important Terms: • Capillary Action • Heat Capacity • Polarity • Adhesion • Cohesion

  4. Adhesion • Sticks to something else

  5. Cohesion • Sticks to itself

  6. Capillary Action • Capillary Action is the ability of a liquid to flow against gravity. • Make a hypothesis about what you think will happen. • Video: The Tissue Bridge Where is each occurring in the demo? • Adhesion? • Cohesion?

  7. How Water Works • Answer the viewing questions on the Properties of Water worksheet as you watch • Video: How Stuff Works – Water • ~35 min long • More difficult alternate: Look up the answers online

  8. Heat Capacity • Heat capacity is how much heat is needed to raise the temperature of a substance by 1˚ C • For example:

  9. Heat Capacity • Honolulu, Hawaii • High (Feb 5, 2014): 78 F (12:53 PM) • Low (Feb 5, 2014): 68 F (12:53 AM) • Past 10 days: ~10 degree difference • Yuma, AZ • High (Feb 5, 2014): 70 F (1:57 PM) • Low (Feb 5, 2014): 53 F (11:57 PM) • Past 10 days: ~20-30 degree difference

  10. Heat Capacity • Video: Balloons on Fire • Which has a greater heat capacity: • Air or water? • Why? • What evidence is there to back up your conclusion?

  11. Surface Tension • How many drops can you fit on a penny? • Video: Penny • What shape does the water make? • Try a penny smeared with dish soap • Video: Penny with Soap

  12. Surface Tension • Water Strider • (Yes, it’s that guy from Top Gear.) • In Spaaaaaaace • Where do you see adhesion? • Where do you see cohesion?

  13. Polarity • Water Bending • Rub a balloon on the cloth. Hold the balloon to a trickle of water. What happens? • Why does the water move towards the balloon (or PCV pipe)?

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