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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

BIM May 30th

Drinking with the Fishes

water water everywhere nor any drop to drink samuel coleridge the rime of the ancient mariner 1798
Water, water, everywhere, Nor any drop to drink.

– Samuel Coleridge, The Rime of the Ancient Mariner, 1798

what does water do for you ugly bags of mostly water
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.

pathway of water through plant
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
the cohesion tension theory the pull
The Cohesion-Tension Theorythe “Pull”
  • The Cohesion-Tension Theory - Transpiration generates tension to pull water columns through plants from roots to leaves.
slide15

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
acids and bases
Acids and Bases

Lemon Juice

Vinegar

Ammonia

Drano

Vitamin C

Baking Powder

Oven Cleaner

Baking Soda

acids and bases1
Acids and Bases

Ammonia

Lemon Juice

Oven Cleaner

Baking Powder

Drano

Vinegar

Baking Soda

Vitamin C

boyle s thoughts on acids and bases
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.”

litmus test
Litmus Test!

1300 A.D. by Spanish alchemists

acids and bases2
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

slide24

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+]