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    Properties20of20water-20bio 1-20spoor20version2021

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    Water has unique properties that make it essential for life on Earth. It is polar and can form hydrogen bonds between molecules. This allows water to act as a universal solvent, dissolving many substances. Water's polarity and hydrogen bonding give it high surface tension, capillary action, resistance to changes in temperature, a high heat of vaporization, and expansion upon freezing. These special properties are crucial for biological functions, regulating Earth's climate, and geological processes.

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    Properties20of20water-20bio 1-20spoor20version2021

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    api-260690009
    307 views15 pages
    Water has unique properties that make it essential for life on Earth. It is polar and can form hydrogen bonds between molecules. This allows water to act as a universal solvent, dissolving many substances. Water's polarity and hydrogen bonding give it high surface tension, capillary action, resistance to changes in temperature, a high heat of vaporization, and expansion upon freezing. These special properties are crucial for biological functions, regulating Earth's climate, and geological processes.

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    properties20of20water-20bio 1-20spoor20version2021

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    Water has unique properties that make it essential for life on Earth. It is polar and can form hydrogen bonds between molecules. This allows water to act as a universal solvent, dissolving many substances. Water's polarity and hydrogen bonding give it high surface tension, capillary action, resistance to changes in temperature, a high heat of vaporization, and expansion upon freezing. These special properties are crucial for biological functions, regulating Earth's climate, and geological processes.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    307 views15 pages

    Properties20of20water-20bio 1-20spoor20version2021

    Uploaded by

    api-260690009
    Water has unique properties that make it essential for life on Earth. It is polar and can form hydrogen bonds between molecules. This allows water to act as a universal solvent, dissolving many substances. Water's polarity and hydrogen bonding give it high surface tension, capillary action, resistance to changes in temperature, a high heat of vaporization, and expansion upon freezing. These special properties are crucial for biological functions, regulating Earth's climate, and geological processes.

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    of 15

    Properties of Water

    Biology 1
    Mr. Spoor

    1. Is the Universal Solvent

    It can dissolve
    many substances,
    like nutrients and
    wastes.

    Negative ion attracts


    positive pole of water

    Positive ion attracts


    negative pole of water

    2. Water has polarity

    This means that one side of the


    molecule is positive, one side is
    negative.

    3. Water has Polar Covalent Bonds


    Negative Pole
    Covalent
    Bond

    Positive Pole

    Covalent
    Bond

    Shared electrons (which are negative)


    spend more time around the O (oxygen).
    This makes the O side of water slightly (-)
    and Hs slightly (+).

    4. One water molecule is attracted to other


    water molecules by hydrogen bonds.
    +

    +
    -

    Hydrogen Bonds
    +
    -

    **Draw this in
    your notes**

    +
    -

    +
    +

    Waters Polarity and its


    Ability to Form Hydrogen
    Bonds:

    gives water unique properties


    which make water very
    important on Earth

    Since water is polar and can


    form hydrogen bonds:
    a. Water molecules are attracted to
    other water molecules by

    COHESION the attraction


    between molecules of the same
    substance

    b. Water molecules are attracted to


    other polar molecules by

    ADHESION the attraction


    between molecules of different
    substances

    5. Exhibits Surface Tension

    This allows the water


    strider to walk on water.

    Water
    molecules
    stick together
    (cohesion) on
    surface of
    water

    6. Capillary Action

    Water can climb thin


    tubes.
    Water is able to
    climb from roots all
    the way up to leaves
    at the top of a tree

    Adhesion to the
    roots
    Cohesion to
    neighboring water
    molecules, pulling
    them along.

    7. Resistance to Changes
    of Temperature
    Water

    can absorb a lot of


    heat without getting hot,
    and can lose a lot of heat
    without getting cold.

    Resistance to temperature change


    allows organisms to maintain constant

    body temperature, AND keeps the Earth at


    a fairly constant temperature.
    Remember about 2/3 of Earth is covered
    with water, and up to 60% of a humans
    weight is water!

    8. High Heat of
    Vaporization

    It takes a lot of heat energy to change


    liquid water to water vapor, because
    hydrogen bonds must be broken.
    Evaporation of sweat takes heat
    energy from the body, allowing sweat
    to cool us.

    9. Expands as it freezes
    Hydrogen
    bonds lock into
    place, and
    push water
    molecules
    farther apart.
    Ice is less
    dense than
    water

    Low Density- Importance of


    Expansion upon Freezing
    a. Ice Floats!
    Life at the
    bottom of lakes
    does not get
    crushed
    Ice also serves
    as an insulator
    b. Ice breaks rocks
    into soil

    So why is water so important?


    Almost every solution is made of
    water.
    Acids and bases are made of water
    We are mostly water.

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