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Capillary Action

Emma Jardine Dr. Fritz period 7. Capillary Action. What happens when a paper towel absorbs water?. Water molecules have a negative and positive end They are attracted to opposite charges on other molecules Water molecules can be attracted to each other and paper

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Capillary Action

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  1. Emma Jardine Dr. Fritz period 7 Capillary Action

  2. What happens when a paper towel absorbs water? • Water molecules have a negative and positive end • They are attracted to opposite charges on other molecules • Water molecules can be attracted to each other and paper • The water is attracted to the paper towel and spreads out

  3. Adhesive Forces • Adhesive forces are the attractive forces between unlike molecules • They are caused by forces acting between two substances • Adhesion causes the liquid to cling to the surface on which it rests

  4. Cohesive Forces • Cohesive forces are the intermolecular forces which cause a tendency in liquids to resist separation • These attractive forces exist between molecules of the same substance • This force tends to unite molecules of a liquid because the molecules' dislike for its surrounding

  5. Effects • When liquid is placed on a smooth surface, the relative strengths of the cohesive and adhesive forces acting on that liquid and determine the shape it will take • If the adhesive forces between a liquid and a surface are stronger, they will cause it to wet the surface • If the cohesive forces between the liquid are stronger, they will resist the adhesion and cause retain its shape

  6. Example Lab

  7. Materials • A glass of water • An empty glass • Paper towels

  8. Directions • 1. Fold the paper towel into a thin strip • 2.Place one end of the paper towel into the glass filled with water and the other into the empty glass • 3. Record what happens

  9. The Beginning • The paper towel starts to get wet

  10. Half An Hour Later • The second cup is starting to fill with water

  11. An Hour Later • The second cup is filling up with more water

  12. A Few Hours Later • The second cup has almost the same amount of water as the first cup

  13. The End Result • There is an even amount of water in each glass

  14. Why did this happen? • The water used capillary action to move along the tiny gaps in the fiber of the paper towels • This happens because of the adhesive force between the water and paper towel being stronger than the cohesive forces inside the water itself

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