1. Water

2. How Unique is Water?? Water is one of only 3 naturally occurring inorganic liquids Only chemical compound that naturally exists in all 3 states—solid, liquid, and gas

3. Why is Water Important? Can dissolve just about anything Liquid water can carry substances around cells, organisms, ecosystems, or the planet Oceans help to moderate Earth’s temperature

4. Water is a polar compound… Shares e- unevenly Oxygen atom has a slight - charge, the Hydrogen atoms take on a slight + charge http://programs.northlandcollege.edu/biolo gy/Biology1111/animations/hydrogenbond s.html http://programs.northlandcollege.edu/biolo gy/Biology1111/animations/hydrogenbond s.html

5. It is water’s polarity that gives it many of its unique properties…

6. Hydrogen Bonding Results from attraction between + & - Water can form H-bonds with up to 4 neighboring water molecules

7. In liquid water, H bonds form and break quickly –http://www.visionlearning.com/library/flash_vie wer.php?oid=1380&mid=57 http://www.visionlearning.com/library/flash_vie wer.php?oid=1380&mid=57http://www.visionlearning.com/library/flash_vie wer.php?oid=1380&mid=57 In solid ice, H bonds lock water molecules in place –http://www.visionlearning.com/library/flash_vie wer.php?oid=1381&mid=57 http://www.visionlearning.com/library/flash_vie wer.php?oid=1381&mid=57http://www.visionlearning.com/library/flash_vie wer.php?oid=1381&mid=57 What happens when water evaporates??

9. Extremely large liquid range (0 o C - 100 o C) Expands, becomes less dense as a solid

10. Cohesion Water molecules have a strong tendency to stick to one another Cohesion allows water to have a high degree of surface tension –Any force is transmitted to the column of water as a whole

11. Adhesion Ability of water to stick to other substances, esp. charged atoms or molecules Together, cohesion and adhesion allow for capillary action