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Water Biology
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Vocabulary Adhesion Buffer Cohesion Hydrogen bond Neutralize Polar
Capillary action Surface tension Solvent Vocabulary
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Property #1: Water is Polar
POLARITY – It has area with a slight positive charge, and an area with a slight negative charge.
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Polarity This polarity gives us the property of Hydrogen Bonding.
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Polarity Hydrogen Bonding allows one water molecule to “stick” to another water molecule.
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Cohesion is the ability for water molecules to stick to themselves
Property #2: Cohesion Cohesion is the ability for water molecules to stick to themselves Beads of Water
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Meniscus in a graduated cylinder
Property #3: Adhesion Adhesion is the ability for water molecules to stick to other materials Meniscus in a graduated cylinder
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Property #4: Capillary action
Capillary action is one of the forces that draw water out of the roots of a plant and up into its stems and leaves. Cohesion holds the column of water together as it rises.
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Property #5: Surface tension
Water has the ability to support small objects. The hydrogen bonds between neighboring molecules cause a film to develop at the surface.
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Property #6: A Great Solvent
Remember… A solvent has the ability to dissolve other materials Water is a solvent for many things For example: The liquid part of your blood is 95% water Some items, such as fats and oils DO NOT dissolve in water.
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