1. Lab BenchGroup Members 1Gustavo, April, Krissia 2Jarren, Jonathan, Julia 3Yoni, Emma, Yanet 4Demorie, Maggie, Sam 5Will, Kate, Emily 6Jario, Malaya 7Ronaldo, Lizzy, Logan 8Demario, Chase, Miquelle

2. Lab BenchGroup Members 1Juanita, Kierstyn, Chase 2Kailey, Lesli, Mariah 3London, Amber, Cortney 4Magdalena, Alexa, Tikiyah 5Meredith, Diego, Nicole 6TyRon, Joli, Hannah 7Emily Flynn, Timmy, Jennifer 8Emily Francis, Omar

3. Properties of Water

4. Water Facts: Formula = H 2 O Three phases – Solid, liquid, and gas Freezing point = 0˚C Boiling point = 100˚C Inorganic molecule (aka: non- living, does not contain Carbon) Polar molecule Universal solvent About 70% of human body is water

5. Polarity Polar molecules:  slightly positive at one end and slightly negative on the other end  Water is a polar molecule!!!!!! Draw this picture

6. Non-polar molecules:  No overall charge Polar molecules dissolve in water Non-polar molecules do not dissolve in water  “Like” dissolves “like”

7. Universal Solvent Solvent – substance that does the dissolving (ie: water) Solute – substance dissolved in a solution (ie:salt) Solution – mixture of solvent and solute (ie: Salt water) http://programs.northlandcollege.edu/biology/Biology111 1/animations/dissolve.html

8. Magic Sand

10. Hydrogen Bonds Hydrogen bond  Bond formed when a positive (+) hydrogen atom of one molecule is attracted to a negative (-) atom of another molecule. ++ + + + + - - -

11. Hydrogen Bonds

13. Cohesion Attraction between substances of the same kind Ex: Water forming drops/beading Caused by hydrogen bonds between water molecules

14. Surface tension Prevents the surface of water from stretching or breaking easily Molecules at the surface of water are linked by hydrogen bonds Result of cohesion

15. Natures use of Surface Tension

16. Drops on a penny

17. Adhesion Attraction between different polar substances Ex: things getting wet

19. Capillary Action Property in which water can travel up tubes Powered by adhesion Ex: plants, trees  Attraction between walls and water is greater than effect of gravity

20. Celery Stalk

22. Density Ratio of the mass of an object to its volume Density = Mass (g)___ Volume (ml) The density of water = 1.0  Density less than 1.0 = floats  Density greater than 1.0 = sinks Ice floats, yet cold water sinks  in ice, molecules spread out (ex: soda can in freezer)  Cold water moves slower than warm water, causing it to sink http://www.youtube.com/wa tch?v=gz4DBn_FFak

23. Ice Cube

25. What causes water to do the amazing things it does?