wednesday, september 19 th
DESCRIPTION
Wednesday, September 19 th. Do Now: Get out your bonding notes (with the polar bear and penguin pictures). Quiz Tomorrow!! Atoms, Ions, Isotopes, pH, Bonding, Water. Turn in your pH lab and worksheet (stapled together). The Extraordinary Properties of Water. H. H. The Molecules. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/1.jpg)
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
![Page 3: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/3.jpg)
The Molecules• A water molecule (H2O), is made
up of three atoms --- one oxygen and two hydrogen.H
HO
![Page 4: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/4.jpg)
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
![Page 5: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/5.jpg)
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
![Page 6: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/6.jpg)
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
![Page 7: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/7.jpg)
What are the
Properties of
Water?
![Page 8: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/8.jpg)
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
![Page 9: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/9.jpg)
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
![Page 11: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/11.jpg)
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.
![Page 12: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/12.jpg)
Adhesion Causes Capillary Action
Which gives water the ability to “climb”
structures
![Page 13: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/13.jpg)
Adhesion Also Causes Water to
Form spheres & hold onto
plant leaves
Attach to a silken
spider web
![Page 14: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/14.jpg)
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.
![Page 15: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/15.jpg)
Water is Less Dense as a Solid
•Which is ice and which is water?
![Page 16: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/16.jpg)
Water is Less Dense as a Solid
Water Ice
![Page 17: Wednesday, September 19 th](https://reader036.vdocuments.us/reader036/viewer/2022062310/56815f35550346895dce04d6/html5/thumbnails/17.jpg)
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