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Water Properties (2.2) Part 1Pre-AP Biology Water Properties (2.2) Part 1
Earth 2/3rds covered by water
Organisms are mostly water
Polar covalent bonding of water molecule See how each end(pole) has an electrical charge?
Hydrogen bonding between water molecules See the central molecule bonding to the 4 outside molecules?
Water needs to get to the leaves for PhotosynthesisWater needs to get to the leaves for Photosynthesis. Cohesion of water helps.
Adhesion See the water molecules binding to the Na+ or Cl-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-?
Earth and Temperature
States of Water on Earth Solid, Liquid, and Gas
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.
Heat Total amount of kinetic energy in a substance There is so much energy moving through the metal, it glows.
Temperature Intensity of all the heat in a substance Which is showing the most intensity? Least?
Ice versus Water It is about molecule movement.
Expansion of water as it freezes Look at the distance between water molecules. Which one looks more dense as a whole?
Life below the water
Water Properties (2.2) Part 2Pre-AP Biology Water Properties (2.2) Part 2
Water dissolving “pulling apart” the salt See the water forming “shells” around the Na+ and Cl-? Which molecule is the solvent? The solute?
Hydrophobic Water “fearing” substances See how they do not interact/mix?
Salt is hydrophilic in water.
Dissociation of Water
pH scale The “H” in pH is for Hydrogen Measuring the concentration of Hydrogen ions (H+) within a substance
Buffering by Bicarbonate in blood Find Bicarbonate in the red blood cells
Acid Rain Source Burning fossil fuels such as oil or gas
The effect of acid rain on plants See the dead trees?
Acid Rain and Concrete
Slide show: Modified from Kim Foglia
Pre-AP Biology Water Properties (2.2) Part 1. Earth 2/3rds covered by water.
Chapter 3: WATER AND THE FITNESS OF THE ENVIRONMENT.
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