pre-ap biology water properties (2.2) part 1. earth 2/3rds covered by water
TRANSCRIPT
Pre-AP Biology
Water Properties (2.2)Part 1
Earth2/3rds 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 moleculesSee the central molecule bonding to the 4
outside molecules?
Cohesion
Water needs to get to the leaves for Photosynthesis.
Cohesion of water helps.
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-?
Surface Tension
Earth and Temperature
States of Water on EarthSolid, 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.
HeatTotal amount of kinetic energy in a substance
There is so much energy moving through the metal, it glows.
TemperatureIntensity of all the heat in a substance
Which is showing the most intensity? Least?
Ice versus WaterIt is about molecule movement.
Evaporative Cooling
Expansion of water as it freezesLook at the distance between water molecules.
Which one looks more dense as a whole?
Water Floating
Life below the water
Pre-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?
HydrophobicWater “fearing” substances
See how they do not interact/mix?
Salt is hydrophilic in water.
Dissociation of Water
pH scaleThe “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 SourceBurning fossil fuels such as oil or gas
The effect of acid rain on plantsSee the dead trees?
Acid Rain and Concrete