wednesday, september 19 th do now: get out your bonding notes (with the polar bear and penguin...
TRANSCRIPT
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Wednesday, September 19th
•Do Now: Get out your bonding notes (with the polar bear and penguin pictures)Turn in your
pH lab and worksheet
(stapled together)
Quiz Tomorrow!!
Atoms, Ions,
Isotopes, pH,
Bonding, Water
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The Molecules• A water molecule (H2O), is made
up of three atoms --- one oxygen and two hydrogen.
H
HO
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The Molecules• In each water molecule, the oxygen
atom attracts more than its "fair share" of electrons = POLAR COVALENT
• The oxygen end “acts” negative• The hydrogen end “acts” positive
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Hydrogen Bonds Exist Between Water Molecules
• Formed between the Oxygen of one molecule and the Hydrogen of another molecule
• One hydrogen bond is weak , but many hydrogen bonds are strong
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Interaction Between Water Molecules
Negative Oxygen end of one water molecule is attracted to the
Positive Hydrogen end of another water molecule to form a
HYDROGEN BOND
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What are the
Properties of
Water?
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Properties of Water• Boiling Point = 100°C• Freezing Point = 0°C• Neutral pH = 7• Universal Solvent: dissolves
more substances that any other liquid
• Cohesive• Adhesive
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Cohesion• Attraction between particles of
the same substance ( why water is attracted to itself)
• Results in Surface tension (a measure of the strength of water’s surface)
• Produces a surface film on water that allows insects to walk on the surface of water
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Adhesion• Attraction between two different substances.• Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton. • Example: transpiration process which plants and trees remove water from the soil, and paper towels soak up water.
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Adhesion Causes Capillary Action
Which gives water the ability to “climb”
structures
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Adhesion Also Causes Water to
Form spheres & hold onto
plant leaves
Attach to a silken
spider web
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Water is Less Dense as a Solid
• Ice is less dense as a solid than as a liquid (ice floats)
• Liquid water has hydrogen bonds that are constantly being broken and reformed.
• Frozen water forms a crystal-like lattice whereby molecules are set at fixed distances.
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Water is Less Dense as a Solid
•Which is ice and which is water?
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Water is Less Dense as a Solid
Water Ice
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H2Olympics• Complete each task on your own.
• There may be more than one person to a station.
• If you spill water clean it up!
• When you are finished answer the questions on the back–#9: viscosity, colder–Omit #14