water - unit 3
DESCRIPTION
Water - Unit 3. 2/3/ 14. Bellringer : Water Issues Start Unit #3 = Water Water Properties Notes. 4 th Period - Extra Credit Opportunity. We need to start the Water Unit!!! Part 1, Part 1 Questions and Part 2 (vampire E) Part 3 of the Kill-A-Watt Lab = Extra Credit. Water Issues. - PowerPoint PPT PresentationTRANSCRIPT
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Water - Unit 3
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2/3/14• Bellringer: Water Issues
• Start Unit #3 = Water
• Water Properties Notes
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4th Period - Extra Credit Opportunity
• We need to start the Water Unit!!!
• Part 1, Part 1 Questions and Part 2 (vampire E)
• Part 3 of the Kill-A-Watt Lab = Extra Credit
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Water Issues
Let’s see what we know …
1) What are the 2 biggest global water issues?2) Name the 5 Great Lakes3) Name 3 rivers within Illinois (or in the USA)4) What are the risks of drinking tap water in
Chicago?
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Water’s Properties1) Covalent 2) Polarity3) Hydrogen Bonds
a) Cohesionb) Adhesionc) Capillary Action
4) High Specific Heata) Moderates Global Temperatures
5) Solid water (ice) is less dense than liquid6) Transparent
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Covalent Bonding
• Oxygen and hydrogen atoms SHARE electrons
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– A water molecule has a slight positive end (H+) and a slight negative end (O-)
– Any unevenly charged molecule is considered “Polar”
– Most of water’s unique properties come from its polarity
1) Polarity
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O
-
-
-
-
-
-
-
-
H-
H-
Water (H2O)
Non-polar: Even distribution of electron charge
Polar: Unequal distribution of election charge
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2) HYDROGEN BONDS• The positive end (H+) of one water molecule bonds
with the negative end (O-) of another water molecule
• Each water molecule can form a maximum of 4 hydrogen bonds
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Hydrogen bond
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2a) Cohesion
• The attraction of water molecules to other water molecules (water “sticks” to itself)
• Responsible for surface tension
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The attraction to other substances (water “sticks” to other substances)
Water is adhesive to
any substance with which it can form hydrogen bonds.
2b) Adhesion
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2c) Capillary action Cohesion and Adhesion together… (stronger force than gravity!)
water taken up by roots
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It takes a LOT of heat to raise or lower the temperature of water
This results in… Global temperatures that compatible with LIFE
3) High Specific Heat
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3a) Moderates Temperatures on Earth
• Water stabilizes air temperatures by absorbing heat from warmer air and releasing heat to cooler air.
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• < 0o C = ICE
• 0o C – 100o C = LIQUID
• > 100o = GAS
3 States of Water
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4) Solid water (ice) is less dense than liquid
same mass but a larger volume
• Water molecules are spread out to their maximum distance when frozen
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Hydrogen bond
Ice
Hydrogen bonds are stable
Liquid water
Hydrogen bondsconstantly break and re-form
ICE
Because only the top
freezes, the living things
underneath don’t freeze to
death
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water expands as it solidifies, so water freezes from the top down
organisms can still live in the water underneath the ice during winter
Oceans and lakes don’t freeze solid because ice floats
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5) Transparency• The fact that water is clear allows light to
pass through it– Aquatic plants can receive sunlight and
photosynthesize
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2/4/14 5th/6th • Bellringer: Water Argument
• Water Properties Stations
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2/4/14 4th • Bellringer: High Specific Heat…
• Water Properties Stations
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Water Argument
• Two students are arguing because one says water uses covalent bonds and the other student says water uses hydrogen bonds. Luckily, you show up just in time to avoid a fight by explaining to them that they are both sort of right.
• Explain, specifically, what you say to them. (you may use a picture to assist in your explanation)
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High Specific Heat1) What does HIGH SPECIFIC HEAT mean?
2) How does water’s high specific heat help moderate global temperatures?
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Rotate through 5 Stations!
• Answer all questions before moving on to the next station…
• Some stations take more time than others, don’t switch until time is up..
• Clean up and put materials back for the next group…
• Work WITH your group. Not ahead or behind!
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2/5/14 4th
• Bellringer: Predict the Decade
• Discuss & Turn in Water Properties Lab
• Go to #205: Water History Research
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2/5/14 5th/6th
• Bellringer: Water Properties Matching
• Predict the Decade
• Go to #205: Water History Research
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Water Properties MatchingMatch the station from Tuesday with the correct water property
YOU MUST WRITE THIS OUT COMPLETELY
1) Drops of water creating a dome on a penny2) Paperclip floating on top of the water3) It takes a lot of energy to heat water4) Water going against gravity up a paper towel
A) Cohesion B) Adhesion C) Surface Tension D) High Specific Heat
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Predict the Decade
• Read the 10 major water-related events in American history.
• Predict which decade each event took place on your worksheet
• Hint: 3-4 events 1870 – 1920 4-5 events 1960 – 1980 3-4 events 1990 – Now
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2/6/14 4th
• Bellringer: Water Properties Review
• Discuss Water Lab from Tuesday
• LAB #205: Complete Water History…
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Water Properties MatchingMatch the station from Tuesday with the correct water property
YOU MUST WRITE THIS OUT COMPLETELY
1) Drops of water creating a dome on a penny2) Paperclip floating on top of the water3) It takes a lot of energy to heat water4) Water going against gravity up a paper towel
A) Cohesion B) Adhesion C) Surface Tension D) High Specific Heat
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2/6/14 5th /6th
• Bellringer: GOALS (Revisited)
• LAB #205: Complete Historical Scavenger Hunt
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2/7/14 4th
• Bellringer:….GOALS Revisited
• Turn in Bellringers
• Go to Room #205: Finish Research
• Extra Credit if you finish early!
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Goals Revisited1) Find 1-2 goals that you did not meet (or are off track) …Explain
why you didn’t reach these goals
2) Find 1-2 goals that you did meet (or are on track) …Explain why you did reach these goals
3) Make at least 6 second semester goals on your goal sheet (measurable)2+ Academic2+ Personal Improvement 2+ Work/Family/Relationships/Clubs
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2/7/14 5th/6th
• Bellringer: Chicago Riversal
• Turn in Bellringers & Water History Timeline
• Chicago River Review• Water Scarcity and Pollution Notes
• HW: USGS Water School Due Monday
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Chicago Riversal
1) Which direction did the Chicago River used to flow?
2) Which body of water did it go into?
3) Which direction does the Chicago River flow now?
4) Which body of water does it now go to?
5) Why was the flow reversed?
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2/10/14
• Bellringer: NO BELLRINGERS THIS WEEK• Discuss Week Plan
• Turn in USGS Activity (5th & 6th)
CONTINUE NOTES• Before the Faucet/After the Flush (video)• Scarcity and Pollution
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Sub (Mr. Washington) All week
Tuesday: Vocab Chart (use textbooks)
Wednesday: No School (Lincoln)
Thursday: Chicago River AssignmentFriday: Chicago River Assignment
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Chicago River Reversal
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Chicago River Reversal
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Fresh Water Issues
1. Scarcity
2. Pollution
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Scarcity: Location of the earth’s water
Reservoir Volume of water(106 km³)
Percentof total
Ocean 1370 97.25Ice caps & glaciers 29 2.05Groundwater 9.5 0.68Lakes 0.125 0.01Soil Moisture 0.065 0.005Atmosphere 0.013 0.001Streams & rivers 0.0017 0.0001Biosphere 0.0006 0.00004
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2/3 of Freshwater is “locked up” in glaciers
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Stepped ArtFig. 11-13, p. 248
1976 2006
Aral Sea
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Aral Sea: World’s Largest Saline Lake
• Since 1960, it has been shrinking and getting saltier because most of the water from the rivers that replenish it has been diverted to grow cotton and food crops.
• This shrunken and now salty lake has caused economic ruin, increasing health problems, and severe ecological disruption.
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3 Gorges Dam - China
• Generates electricity for millions of people, allows rural china to develop into 21st century, creates reservoir for water use
• Displaced 1.3 million people. • Flooded ancient archeological sites• Increases the risk of landslides• Ruins biodiversity of a unique river system
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Fig. 11-2, p. 238
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The Colorado River Story
• 1400 miles through 7 states• 14 dams and reservoirs• Electricity for 30 million people• Water for 15% of U.S. crops and livestock
• The Colorado River no longer reaches the Gulf of California
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Fig. 11-1, p. 238
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Fig. 11-11, p. 247
Flow
(bill
ion
cubi
c met
ers)
0
5
10
15
20
25
30
35
Year
1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Hoover Damcompleted (1935)
Glen CanyonDam completed(1963)
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Scarcity of fresh waterOn a global basis, fresh water is an increasingly scarce resource.
Why is this a RECENT issue?
1) Increasing population 2) Higher consumption per person 3) Changes in Global Climate
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Example of High Consumption per person
• Meat production use a lot of water when compared to growing food crops.
• More wealth = More beef
• This has caused substantial increase in water consumption.
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Competing water uses
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Competing water usesDeveloped Developing
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Competing water uses
• 1st World/Developed countries tend to use more water in their industrial production.
• 3rd World/Developing countries tend to use more water for agricultural uses.
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Problems caused by water scarcity1) 1 billion people have limited or no access to safe
drinking water
2) Lack of Agricultural yields (no water for crops)
3) Regional conflicts over scarce water resources (can result in war)
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Fig. 11-6, p. 243
Australia
Stress
NoneHigh
NorthAmerica
SouthAmerica
Africa
Europe Asia
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Fig. 11-4, p. 241
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Some Solutions…
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Fig. 11-15, p. 251
Solutions to Agricultural Scarcity
1) Drip Irrigation2) Irrigate at night (less evaporation)3) Don’t grow thirsty crops in dry areas4) Irrigate using graywater (used water)
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Fig. 11-16, p. 252
Solutions to Residential Scarcity
1) Raise water prices!2) Low flow showers/toilets3) Reuse water for plants/lawns4) Fix leaks
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How to Reduce GLOBAL Scarcity?
1) Withdraw groundwater ($)
2) Build Dams to create reservoirs ($$)
3) Transport surface water ($$)
4) Desalination ($$$)
5) Water conservation (free)
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• Water SCARCITY is only half of the problem…
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2. Water Pollution
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Causes of water pollution:
1. Industrialization2. Agriculture3. Population growth
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Point PollutionDefinition: pollution discharged from a single source
Examples: water discharged by industries, waste treatment plants, leaking underground storage tanks
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Decomposition
Zone
Biologicaloxygen
demand
Pollutant-tolerant fishes
(carp, gar)
Fish absent,
fungi, sludgeworms,bacteria
(anaerobic)
8 ppm
8 ppm
Clean Zone
Clean Zone
Recovery Zone
Septic Zone
Types of organisms
Dissolved
oxygen (ppm)
Normal clean water
organisms(Trout, perch,
bass,mayfly, stonefly)
Normal clean water organisms
(Trout, perch, bass,
mayfly, stonefly)
Fig. 11-21, p. 258
Pollutant-tolerant fishes
(carp, gar)
Point source
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Preventing Point-Source Pollution
• Identify “point-sources”• Keep point-sources away from water
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Nonpoint PollutionDefinition: pollution that comes from many different
sources and is hard to identify
Examples: water runoff from streets, chemicals added to lawns and crops, feces from cattle, oil and gas from personal water craft
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Preventing Nonpoint Source Pollution
• Reduce fertilizer use• Use plant buffer zones around fields and
animal feedlots• Keep feedlots away from slopes, surface
water, and flood zones• Organic farming methods
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Eutrophication
Definition: an increase in the amount of nutrients, such as nitrates, in a marine or aquatic ecosystem
Natural ecosystems may be eutrophic (high in nutrients) or oligotrophic (low in nutrients)
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Artificial Eutrophication
Caused by humans, due to sewage or fertilizer runoff from farms, lawns, gardens, golf courses; also due to addition of detergents to water
Result: algal bloom, then algal death and decomposition (by aerobic microbes) and oxygen depletion, death of aquatic organisms
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Eutrophication of mangrove swamp in Florida
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Artificial Eutrophication Northern Gulf of Mexico
• Caused by fertilizer use in Mississippi watershed
• Mouth of Mississippi River in spring and summer
• Suffocates fish, crab, shrimp
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Stepped Art
MississippiRiver Basin
Missouri River
Ohio River
Mississippi River
Depleted oxygen
Fig. 11-A, p. 265
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How do we Reduce Polluted Water?
1) Enforce existing EPA regulations2) Create Stricter EPA regulations3) Education about what can and can’t go down the drain4) Vegetation “buffer zones” between pollution source and waterway
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How to create purified drinking water
• Developed countries1) Reservoir storage2) Purification plant
• Developing countries (no purification plant) 1) Clear plastic bottle in sun, slowly kills bacteria2) LifeStraw (invented 2005)
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Fig. 11-25, p. 263