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Essential Question
What’s so great about water?
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Properties of Water
• Single most abundant compound in most living things.
• Water expands as it freezes = meaning ice is less dense then liquid water.
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Polarity of water
• 8 protons in nucleus of oxygen• 1 proton in nucleus of hydrogen• Molecule has a bent shape• Oxygen end of molecule
Has a slight negative
Charge• Polar molecule = because there is an uneven
distribution of electrons between the oxygen and hydrogn atoms.
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Water• Attraction between
the hydrogen atom on one water molecule and the oxygen atom on another=Hydrogen Bond
• Water is extremely cohesive -> molecules on surface draw inward allowing drops on smooth surface to form a bead
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Water• Water has
adhesion easily seen when measuring volume in a graduated cylinder.
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Solutions
Solutions=> ALL components are evenly distributed throughout the solution.
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SoluteSubstance that
is dissolved
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Solvent
Water
The substance in which the solute dissolves
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Suspension• Mixture of
water and nondissolved material
• Blood in HUMAN body is mostly water which contains many dissolved compounds
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Water is for life:
Every HUMAN body cell needs water because many of the body’s processes,
including chemical reactions, take place in water.
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What happens to life when the drinking water is unclean?
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Water in plant life:• Tracheids-plant cells
that transport water within plant. Connected end-to-end like a straw.
• Xylem-transport subsytem that carries water upward from roots to parts of plant
• Phloem-second transport subsystem transporting solutions of nutrients and carbs produced during photosynthesis.
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Transpiration
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