1. September 2012 Mr. Johnson Biology

2. Objectives SWBAT explain the properties of water by completing the Water: Essential for Life Lab SAT Word: humane (adj.) kind or merciful Drill: 1. Define hydrophobic. 2. Define hydrophilic.

3. Key Vocabulary  Nutrients- a source of nourishment for the body  Organic- composed of hydrogen and carbon  Inorganic- not composed of carbon and hydrogen

4. Water Lab  Visit Each Station and Record your Data on your Lab Sheet  Station 1 do at your seat.  Stations 7 and 8- continue the experiment from the previous group while you are there. We will go over the data as a class.

5. Notes Properties of Water

6. What are the Properties of Water?  Polar Molecule  Capillary Action  Cohesion  Surface Tension  Universal Solvent  Heat Absorber  Cooling Agent

7.  Molecules that have positive and negative ends because their atoms do not share electrons equally.

8. What is Capillary Action?  Hydrophilic surfaces and water molecules are attracted to each other causing water molecules to be forced up through a hydrophilic container (due to bonding).

9. What is Cohesion?  Water molecules cling to themselves through hydrogen bonding.

10.  Cohesion at a surface  (water molecules sticking together at a surface)

11. What is a Solute?  A substance that is dissolved into a liquid.  Ex. Sugar, salt, kool-aid mix, etc.

12. What is a Solvent?  A liquid that dissolves a solute.  Ex. Water, milk, etc.

13. What is a Solution?  A combination of a solute and a solvent.  Ex. Chocolate milk, saltwater, etc.

14. What is a Universal Solvent?  Water can dissolve any polar molecules or ion.  This includes sugar, amino acids, salt, etc.

15. What is a Heat Absorber?  Water can absorb a lot of heat before it raises its temperature and evaporates in the form of steam.

16. What is a Cooling Agent?  When water evaporates, it takes with it the heat that is absorbed.  This causes a drop in temperature.

17. Summary Let’s go back to the objective. “SWBAT explain the properties of water by completing the Water: Essential for Life Lab” ~Was the objective met? ~Take a moment and summarize what you have learned today.

18. Homework  Complete the Extension and Application Questions from the Water Lab.