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Exploring Water Properties in Pre-AP Biology: Earth's Vital Molecule and Its Unique Characteristics

Discover the essential properties of water in biology with a focus on its abundance on Earth, polar covalent bonding, hydrogen bonding, and cohesion. Explore how water supports life processes like photosynthesis, adhesion, and surface tension. Learn about the states of water, including solid, liquid, and gas, and the concept of evaporation requiring a significant amount of energy. Delve into topics like heat, temperature, ice versus water density, evaporative cooling, and the expansion of water upon freezing. Understand the roles of water as a solvent and its interaction with hydrophobic and hydrophilic substances. Explore water dissociation, the pH scale, and buffering mechanisms like bicarbonate in blood. Dive into the impact of acid rain from burning fossil fuels on plants and concrete structures.

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Exploring Water Properties in Pre-AP Biology: Earth's Vital Molecule and Its Unique Characteristics

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  1. Pre-AP Biology Water Properties (2.2) Part 1

  2. Earth2/3rds covered by water

  3. Organisms are mostly water

  4. Polar covalent bonding of water molecule See how each end(pole) has an electrical charge?

  5. Hydrogen bonding between water moleculesSee the central molecule bonding to the 4 outside molecules?

  6. Cohesion

  7. Water needs to get to the leaves for Photosynthesis.Cohesion of water helps.

  8. AdhesionSee the water molecules binding to the Na+ or Cl-?Which atoms of water are are attracted to the Na+?How about to the Cl-?

  9. Surface Tension

  10. Earth and Temperature

  11. States of Water on EarthSolid, Liquid, and Gas

  12. 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.

  13. HeatTotal amount of kinetic energy in a substanceThere is so much energy moving through the metal, it glows.

  14. TemperatureIntensity of all the heat in a substanceWhich is showing the most intensity? Least?

  15. Ice versus WaterIt is about molecule movement.

  16. Evaporative Cooling

  17. Expansion of water as it freezesLook at the distance between water molecules.Which one looks more dense as a whole?

  18. Water Floating

  19. Life below the water

  20. Pre-AP Biology Water Properties (2.2) Part 2

  21. Water dissolving “pulling apart” the salt See the water forming “shells” around the Na+ and Cl-?Which molecule is the solvent? The solute?

  22. HydrophobicWater “fearing” substancesSee how they do not interact/mix?

  23. Salt is hydrophilic in water.

  24. Dissociation of Water

  25. pH scaleThe “H” in pH is for HydrogenMeasuring the concentration of Hydrogen ions (H+) within a substance

  26. Buffering by Bicarbonate in bloodFind Bicarbonate in the red blood cells

  27. Acid Rain SourceBurning fossil fuels such as oil or gas

  28. The effect of acid rain on plantsSee the dead trees?

  29. Acid Rain and Concrete

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