1. Catalyst: December 9th, 2013 Complete problems:
You will be timed. THIS IS OUR LAST COMPLETION ALA. (We will begin grading for correctness after the break.)

2. Agenda Catalyst (10 minutes) SWAT (7 minutes)
Review Slides (5 minutes)
Osmosis Eggsperiment, part 1 (10 minutes)
Osmosis Worksheet (Remaining)
Homework:
Study for Osmosis quiz

3. Announcements Mastery Packets: DUE WEDNESDAY. NO EXCEPTIONS.
Office hours tomorrow: LAST CHANCE TO COME AND GET HELP WITH PACKETS!
Dojo review at the end of class
What will my report card look like?
EOC Progress Quiz
Classification Standard
MM standard grades
Cells standard grades
Discovery Assessment A
Osmosis “mini-standard”
Honors: Projects

4. Unit 5.2: Guiding Questions
How does a cell make sure it has enough water and nutrients?
What happens to the cell in different environments?
How do cells take in the nutrients they need and release the substances they do not?

5. Today’s SPI & Objectives
SPI Predict the movement of water and other molecules across selectively permeable membranes.
SWBAT define solute and solvent in order to understand the components of a solution
SWBAT define osmosis
SWBAT define hypotonic, hypertonic, and isotonic solutions and predict the effect of each solution on a cell

6. Osmosis and Solutions

7. Isotonic solution
Hypertonic solution
Solvent
Hypotonic solution
Solution
Selectively permeable
Solute
Osmosis
Dynamic equilibrium

8. Review
What is osmosis?
Osmosis is the movement of water across a semi-permeable membrane from high solvent concentration to low solvent concentration
Water always moves from where there is relatively more water to relatively less water

9. Review: Hypotonic Hypotonic solutions: Where does more water move?
Lower solute concentration than the cytoplasm
Where does more water move?
More water moves into the cell
What happens to the cell in a hypotonic solution?
The cell swells

10. Review: Hypertonic Hypertonic solutions: Where does more water move?
Higher solute concentration than the cytoplasm
Where does more water move?
More water moves out of the cell
What happens to the cell in a hypertonic solution?
The cell shrinks

11. Review: Isotonic Isotonic solutions: Where does more water move?
Same solute concentration as the cytoplasm
Where does more water move?
The same amount of water moves in and out
What happens to the cell in a isotonic solution?
The cell remains the same size

12. Osmosis “Egg”speriment
Vinegar has been used to dissolve the shell of the two eggs
1 egg will be placed in fresh water for at least 24 hours
What type of solution is fresh water?
What do you predict will happen to the egg?
1 egg will be placed in corn syrup for at least 24 hours
What type of solution is corn syrup?
Introduction: A chicken egg can be viewed as a single cell, although it technically is not. The membrane surrounding the yolk and under the shell is semi-permeable. In this class demonstration, the shells have been removed from two eggs. We will place one egg in fresh water and one egg in corn syrup for 24 hours. Food coloring will also be added to the water. Our goal is to investigate the effects of two solutions—fresh water and corn syrup—with different solute concentrations on the egg.

13. Osmosis Eggsperiment 2 eggs have had their shells removed
The egg serves as a single cell, although it technically is not
1 egg will be placed in fresh water for 24 hours
What type of solution is the fresh water?
1 egg will be placed in corn syrup for 24 hours
What type of solution is the corn syrup?
What do you predict will happen?

14. Directions: Worksheet
Complete all 9 questions on the Osmosis and Solutions Worksheet
Use your notes for assistance
Check with Ms. M when you are done

15. Osmosis and Solutions WS
Review questions 1-9

16. Catalyst #3: December 6th, 2013
What happens to a cell when it is located in a solution with a lower solute concentration than the inside of the cell?
Where does more water move when a cell is in a hypertonic solution?
In what type of solution are the cells pictured below?

17. Agenda Catalyst: 5 minutes Osmosis Eggsperiment, part 2: 10 minutes
Osmosis Partner Relay: Remaining
Homework:
Study for Osmosis quiz!

18. Announcements

19. Unit 5.2: Guiding Questions
How does a cell make sure it has enough water and nutrients?
What happens to the cell in different environments?
How do cells take in the nutrients they need and release the substances they do not?

20. Today’s SPI & Objectives
SPI Predict the movement of water and other molecules across selectively permeable membranes.
SWBAT define solute and solvent in order to understand the components of a solution
SWBAT define osmosis
SWBAT define hypotonic, hypertonic, and isotonic solutions and predict the effect of each solution on a cell

21. Osmosis Eggsperiment Record egg mass afterwards
What happened to the egg after 24 hours in the fresh water?
What happened to the egg after 24 hours in the corn syrup?
Was there any food coloring inside of the egg in the fresh water?

22. Partner Relay (~8 minutes each)
Answer the two sections individually or with 1 or 2 partners.
When you finish, line up at the front. Ms. Mitchell will ask each partner ONE question (or if you are by yourself—two!)
The first five teams to win….