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5. Water Notes
 

5. Water Notes

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    5. Water Notes 5. Water Notes Presentation Transcript

    • Water Notes:
    • Water:
      Composed of two hydrogen atoms and one oxygen atoms
      H2O
      Polar Molecule
    • Polarity:
      Unevenly distributed charges due to unequal forces placed on bonding electrons
      Oxygen ends slightly negative
      Hydrogen end slightly positive
    • Results of Polarity:
      Allows water to form Hydrogen Bonds
    • Result of Polarity:
      Hydrophilic: All polar molecules attracted to water
    • Result of Polarity:
      Hydrophobic: Repels non-polar substances such as water
    • Stabilizes Temperature:
      Hydrogen bonds between molecules absorb heat energy, thus molecules do not move faster, therefore temperature does not rise as quickly
      Need more heat energy to change temperature
    • Cohesiveness:
      Hydrogen bonding locks molecules together
      Surface Tension: Cohesion at the water’s surface
    • Cohesiveness:
      Adhesion: when water attaches to non-water molecules
      COHESION
      ADHESION
    • Cohesiveness:
      Capillary Action: Movement of water up
    • Universal Solvent:
      Ions and polar molecules readily dissolve in water
      Substances such as salt are pulled apart by attraction of opposite charges due to polar structures
    • Density:
      Water has a density of 1g/mL
      One of the few substances that is less dense as a solid than liquid
      Due to hydrogen bonding and resultant pockets