Essential Question

What’s so great about water?

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

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

Solvent

Water

The substance in which the solute dissolves

Suspension• Mixture of

water and nondissolved material

• Blood in HUMAN body is mostly water which contains many dissolved compounds

Water is for life:

Every HUMAN body cell needs water because many of the body’s processes,

including chemical reactions, take place in water.

What happens to life when the drinking water is unclean?

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