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Water!. Marine Science 2010. Why Water is Your Friend…. Water has several properties which make life possible Transparency Cohesion & Adhesion Temperature buffer Solvent ability. Covalent Bonds. In covalent bonds, atoms share electrons Vs. ionic where electrons are stolen.

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Water

Water!

Marine Science 2010


Why water is your friend
Why Water is Your Friend…

  • Water has several properties which make life possible

    • Transparency

    • Cohesion & Adhesion

    • Temperature buffer

    • Solvent ability


Covalent bonds
Covalent Bonds

  • In covalent bonds, atoms share electrons

    • Vs. ionic where electrons are stolen


Unique properties bonding
Unique Properties: Bonding

  • An H2O molecule consists of 2 H atoms and 1 O atom covalently bonded together.

  • Our Moon orbits Earth, simply because Earth has more mass, thus more gravitational pull.

  • Now, apply that same concept to H2O: All the electrons orbit oxygen since it has more mass.



Hydrogen bonds
Hydrogen Bonds

  • So, since the water molecule has a negative and a positive end, it is called a polar molecule.

  • Since opposite charges attract, water will also bond with itself. This is called a hydrogen bond


Polarity leads to more unique properties
Polarity Leads to More Unique Properties…

  • Cohesion

  • Adhesion

  • High Heat Capacity

  • Density

  • Solvent Ability


Cohesion
Cohesion

  • Water’s tendency to stick to itself

    • Ex: surface tension


Adhesion
Adhesion

  • Water’s tendency to stick to other materials

    • Ex: the meniscus

    • Ex: capillary action


Heat capacity
Heat Capacity

  • It takes a lot of energy to raise or lower the temp. of water

    • Water resists temperature change

      • Helps moderate climates

      • Allows organisms to maintain homeostasis


H 2 o as a temp buffer
H2O as a Temp Buffer

  • Water’s temp buffering effect causes the oceans to be a stable environment

    • Very important for the early evolution of life when conditions on land were severe and ever-changing


Ice life
Ice & Life

  • Ice is less dense than liquid water; it floats.

    • If it sank, lakes and oceans would freeze solid, and early life, existing totally within them, would have been extinguished.


Ice fishing
Ice Fishing

  • While not crucial to life, ice fishing is a recreation enjoyed by millions.

  • It can be dangerous, however, and should be attempted with great caution.

  • http://www.youtube.com/watch?v=3zf-a5AD7gM


The universal solvent
The Universal Solvent

  • Because of its polarity, water’s charged areas can pull apart ionic or polar compounds


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