pre-ap biology water properties (2.2) part 1. earth 2/3rds covered by water
TRANSCRIPT
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Pre-AP Biology
Water Properties (2.2)Part 1
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Earth2/3rds covered by water
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Organisms are mostly water
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Polar covalent bonding of water molecule See how each end(pole) has an electrical
charge?
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Hydrogen bonding between water moleculesSee the central molecule bonding to the 4
outside molecules?
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Cohesion
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Water needs to get to the leaves for Photosynthesis.
Cohesion of water helps.
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Adhesion See the water molecules binding to the Na+ or Cl-?
Which atoms of water are are attracted to the Na+?How about to the Cl-?
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Surface Tension
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Earth and Temperature
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States of Water on EarthSolid, Liquid, and Gas
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All four Hydrogen bonds have to break at the same time to allow water to evaporate
in a gas. That requires a lot of Energy.
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HeatTotal amount of kinetic energy in a substance
There is so much energy moving through the metal, it glows.
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TemperatureIntensity of all the heat in a substance
Which is showing the most intensity? Least?
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Ice versus WaterIt is about molecule movement.
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Evaporative Cooling
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Expansion of water as it freezesLook at the distance between water molecules.
Which one looks more dense as a whole?
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Water Floating
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Life below the water
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Pre-AP Biology
Water Properties (2.2)Part 2
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Water dissolving “pulling apart” the salt See the water forming “shells” around the Na+ and Cl-?
Which molecule is the solvent? The solute?
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HydrophobicWater “fearing” substances
See how they do not interact/mix?
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Salt is hydrophilic in water.
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Dissociation of Water
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pH scaleThe “H” in pH is for Hydrogen
Measuring the concentration of Hydrogen ions (H+) within a substance
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Buffering by Bicarbonate in blood Find Bicarbonate in the red blood cells
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Acid Rain SourceBurning fossil fuels such as oil or gas
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The effect of acid rain on plantsSee the dead trees?
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Acid Rain and Concrete