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BIM May 30 th

BIM May 30 th. Drinking with the Fishes. How does the fact that ice floats affect life in a lake? . Water, water, everywhere, Nor any drop to drink. – Samuel Coleridge, The Rime of the Ancient Mariner, 1798 . The Water Cycle. What does water do for YOU? “Ugly bags of mostly water”.

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BIM May 30 th

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  1. BIM May 30th Drinking with the Fishes

  2. How does the fact that ice floats affect life in a lake?

  3. Water, water, everywhere, Nor any drop to drink. – Samuel Coleridge, The Rime of the Ancient Mariner, 1798

  4. The Water Cycle

  5. What does water do for YOU?“Ugly bags of mostly water”   Humans can survive for weeks without food but we can only survive 3 or 4 days without water.

  6. Osmosis: water in and out of cells

  7. Pathway of water through plant: • Enters from soil into cell walls and intercellular spaces of root hairs and roots • Crosses differentially permeable membrane and cytoplasm of endodermis, then into xylem • Flows through xylem to leaves and diffuses out through stomata

  8. Pushing and Pulling Water “Evapotranspiration”

  9. Pathway into plant pipes…the “Push”

  10. The “Pull”: Opening and Closing Stomata

  11. The Cohesion-Tension Theorythe “Pull” • The Cohesion-Tension Theory - Transpiration generates tension to pull water columns through plants from roots to leaves.

  12. Why isn’t xylem huge? • Adhesion – water molecules stick to other polar molecules by hydrogen bonding • Cohesion – water molecules stick to other water molecules by hydrogen bonding

  13. What is Acid Rain?

  14. Acids and Bases Lemon Juice Vinegar Ammonia Drano Vitamin C Baking Powder Oven Cleaner Baking Soda

  15. Acids and Bases Ammonia Lemon Juice Oven Cleaner Baking Powder Drano Vinegar Baking Soda Vitamin C

  16. Robert Boyle (1627-1691) (another Father of chemistry)

  17. Boyle’s thoughts on acids and bases… “Acids taste sour, are corrosive to metals, change litmus red, and become less acidic when mixed with bases. Bases feel slippery, change litmus blue, and become less basic when mixed with acids.”

  18. Litmus Test! 1300 A.D. by Spanish alchemists

  19. Acids and bases • Pure water • [H+] of 10–7 mol/L • Considered to be neutral • Neither acidic nor basic pH is the negative logarithm of hydrogen ion concentration of solution

  20. Acid • Any substance that dissociates in water to increase the [H+] (and lower the pH) • The stronger an acid is, the more hydrogen ions it produces and the lower its pH • Base • Substance that combines with H+ dissolved in water, and thus lowers the [H+]

  21. What is Acid Rain?

  22. Water Pollution

  23. 520 B.C.

  24. Haiti, 2010 quake: over 3000 dead from cholera outbreak

  25. Other Slides

  26. Changes in States of Matter (H20)

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