1. Catalyst – November 31-2, 2010 Monday Mystery Element! 1. s-block element 2. So soft it can be cut with a knife 3. Reduces muscle weakness, fatigue, irritability, constipation Welcome Back!!!

2. Catalyst – November 31-2, 2010 Monday Mystery Element! 1. s-block element 2. So soft it can be cut with a knife 3. Reduces muscle weakness, fatigue, irritability, constipation POTASSIUM!

3. Today’s Agenda  Catalyst  Welcome Back!!!!  New Groups!  Notes: Solutions, Dissolving vs. Dissociation, Electrolytes  Work Time  Exit Question

4. Today’s Objectives  SWBAT describe solutions.  SWBAT distinguish between dissolving and dissociation.  SWBAT explain electrolytes.

5. Welcome Back!  Get the Back-To-School-After- Turkey-Day-Blues outta your system….  3 minutes to chit-chat, share stories, chill, etc…  After New Groups…

6. New Groups  Take anything that belongs to you out of your folder  You may sit where you like, but make sure you are in a location and group where you can work effectively  Ms. Stroh reserves the right to change your seat if it’s not working out

7. What is a solution…..in SCIENCE?

8. Notes: Solutions Key Point #1: A solution is a homogeneous mixture composed of a solute and a solvent.  Solute: the substance dissolved in the solution (often a solid)  Solvent: the dissolving medium in the solution (often a liquid)

9. Solutions Let’s consider an example…can you think of any others???? Solute: Gatorade mix Solvent: Water

10. Notes: Dissolving vs. Dissociation  Key Point #2: Dissolving is the process by which a solute ‘goes into’ a solvent without breaking apart into ions An ion is a charged particle (positive or negative)

11. Dissolving vs. Dissociation  Key Point #3: Dissociation is the process by which a solute ‘goes into’ a solvent and does break apart into ions An ion is a charged particle (positive or negative)

12. Dissolving vs. Dissociation  Dissolving and dissociation are very similar terms, but they are not the same thing…  It can be said that everything that dissociates dissolves, but not everything that dissolves dissociates.

13. Salt - NaCl Sugar - C 11 H 12 O 11 What will happen when we put each of these in water?

14. Salt - NaCl Sugar - C 11 H 12 O 11 Na + Cl - C 11 H 12 O 11 What will happen when we put each of these in water?

15. Dissolving vs. Dissociation  Which one dissolves?  Which one dissociates?

16. Salt - NaCl Sugar - C 11 H 12 O 11 Na + Cl - C 11 H 12 O 11 What will happen when we put each of these in water? DISSOCIATION DISSOLVING

17. Dissolving vs. Dissociation Why does this matter?

18. Notes: Electrolytes  Key Point #4: Ionic compounds dissociate (break apart) into ions when they are put into a water solvent. These compounds conduct electricity and are called electrolytes.

19. Electrolytes in Action!!!! Electrolyte Video From a College Class!

20. Examples of Dissociation 1. If you put NaCl into water it breaks up into…  NaCl  2. If you put H 2 SO 4 into water it breaks up into…  H 2 SO 4 

21. Dissociation In Action! http://phet.colorado.edu/simul ations/sims.php?sim=Salts_an d_Solubility

22. Independent Practice  Worksheet time!  Finish for homework!  Researching extra credit opportunity at the end!

23. Exit Question 1. Mr. Bogard really loves hummingbirds. He heard on the news that hummingbirds love sugar water, so he boils water and then dissolves a lot of sugar in the water. Identify the solute in this scenario. 2. What is the main difference between dissolving and dissociation?