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Water - Unit 3 PowerPoint Presentation
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Water - Unit 3

Water - Unit 3

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Water - Unit 3

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  1. Water - Unit 3

  2. 2/3/14 • Bellringer: Water Issues • Start Unit #3 = Water • Water Properties Notes

  3. 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

  4. Water Issues Let’s see what we know … • What are the 2 biggest global water issues? • Name the 5 Great Lakes • Name 3 rivers within Illinois (or in the USA) • What are the risks of drinking tap water in Chicago?

  5. Water’s Properties 1) Covalent 2) Polarity 3) Hydrogen Bonds a) Cohesion b) Adhesion c) Capillary Action 4) High Specific Heat a) Moderates Global Temperatures 5) Solid water (ice) is less dense than liquid 6) Transparent

  6. Covalent Bonding • Oxygen and hydrogen atoms SHARE electrons

  7. 1) Polarity • 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

  8. - - - - O - - H H - - - - Water (H2O) Non-polar: Even distribution of electron charge Polar: Unequal distribution of election charge

  9. 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 2) HYDROGEN BONDS

  10. Hydrogen bond

  11. 2a) Cohesion • The attraction of water molecules to other water molecules (water “sticks” to itself) • Responsible for surface tension

  12. 2b) Adhesion The attraction to other substances (water “sticks” to other substances) Water is adhesive to any substance with which it can form hydrogen bonds.

  13. 2c) Capillary action Cohesion and Adhesion together… (stronger force than gravity!) water taken up by roots

  14. 3) High Specific Heat • It takes a LOT of heat to raise or lower the temperature of water • This results in… Global temperatures that compatible with LIFE

  15. 3a) Moderates Temperatures on Earth • Water stabilizes air temperatures by absorbing heat from warmer air and releasing heat to cooler air.

  16. 3 States of Water • < 0o C = ICE • 0o C – 100o C = LIQUID • > 100o = GAS

  17. 4) Solid water (ice) is less dense than liquid • Water molecules are spread out to their maximum distance when frozen same mass but a larger volume

  18. Because only the top freezes, the living things underneath don’t freeze to death Hydrogen bond ICE Ice Liquid water Hydrogen bonds constantly break and re-form Hydrogen bonds are stable

  19. Oceans and lakes don’t freeze solid because ice floats water expands as it solidifies, so water freezes from the top down organisms can still live in the water underneath the ice during winter

  20. 5) Transparency • The fact that water is clear allows light to pass through it • Aquatic plants can receive sunlight and photosynthesize

  21. 2/4/14 5th/6th • Bellringer: Water Argument • Water Properties Stations

  22. 2/4/14 4th • Bellringer: High Specific Heat… • Water Properties Stations

  23. 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)

  24. High Specific Heat 1) What does HIGH SPECIFIC HEAT mean? 2) How does water’s high specific heat help moderate global temperatures?

  25. 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!

  26. 2/5/14 4th • Bellringer: Predict the Decade • Discuss & Turn in Water Properties Lab • Go to #205: Water History Research

  27. 2/5/14 5th/6th • Bellringer: Water Properties Matching • Predict the Decade • Go to #205: Water History Research

  28. Water Properties Matching Match the station from Tuesday with the correct water property YOU MUST WRITE THIS OUT COMPLETELY 1) Drops of water creating a dome on a penny 2) Paperclip floating on top of the water 3) It takes a lot of energy to heat water 4) Water going against gravity up a paper towel A) Cohesion B) Adhesion C) Surface Tension D) High Specific Heat

  29. 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

  30. 2/6/14 4th • Bellringer: Water Properties Review • Discuss Water Lab from Tuesday • LAB #205: Complete Water History…

  31. Water Properties Matching Match the station from Tuesday with the correct water property YOU MUST WRITE THIS OUT COMPLETELY 1) Drops of water creating a dome on a penny 2) Paperclip floating on top of the water 3) It takes a lot of energy to heat water 4) Water going against gravity up a paper towel A) Cohesion B) Adhesion C) Surface Tension D) High Specific Heat

  32. 2/6/14 5th /6th • Bellringer: GOALS (Revisited) • LAB #205: Complete Historical Scavenger Hunt

  33. 2/7/14 4th • Bellringer:….GOALS Revisited • Turn in Bellringers • Go to Room #205: Finish Research • Extra Credit if you finish early!

  34. Goals Revisited • Find 1-2 goals that you did not meet (or are off track) …Explain why you didn’t reach these goals • Find 1-2 goals that you didmeet(or are on track) …Explain why you did reach these goals • Make at least 6 second semester goals on your goal sheet (measurable) 2+ Academic 2+ Personal Improvement 2+ Work/Family/Relationships/Clubs

  35. 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

  36. Chicago Riversal • 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?

  37. 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

  38. Sub (Mr. Washington) All week Tuesday: Vocab Chart (use textbooks) Wednesday: No School (Lincoln) Thursday: Chicago River Assignment Friday: Chicago River Assignment

  39. Chicago River Reversal

  40. Chicago River Reversal

  41. Fresh Water Issues • Scarcity 2. Pollution

  42. Scarcity: Location of the earth’s water

  43. 2/3 of Freshwater is “locked up” in glaciers

  44. 1976 2006 Aral Sea Stepped Art Fig. 11-13, p. 248

  45. 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.

  46. 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

  47. Fig. 11-2, p. 238