Catalyst: December 9th, 2013 o Complete problems:

o You will be timed. THIS IS OUR LAST COMPLETION ALA. (We will begin grading for correctness after the break.)

AgendaCatalyst (10 minutes)SWAT (7 minutes) Review Slides (5 minutes)Osmosis Eggsperiment, part 1 (10

minutes)Osmosis Worksheet (Remaining)

Homework: Study for Osmosis quiz

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 QuizClassification StandardMM standard gradesCells standard gradesDiscovery Assessment A Osmosis “mini-standard” Honors: Projects

Unit 5.2: Guiding QuestionsHow 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?

Today’s SPI & ObjectivesSPI 3210.1.7 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 osmosisSWBAT define hypotonic, hypertonic, and

isotonic solutions and predict the effect of each solution on a cell

Osmosis and Solutions

Solution

Solute

Solvent

Hypertonic solution

Hypotonic solution

Osmosis

Dynamic equilibrium

Isotonic solution

Selectively permeable

ReviewWhat is osmosis?Osmosis is the movement of water

across a semi-permeable membrane from high solvent concentration to low solvent concentrationWater always moves from where there is

relatively more water to relatively less water

Review: HypotonicHypotonic solutions:

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

Review: HypertonicHypertonic solutions:

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

Review: IsotonicIsotonic solutions:

Same solute concentration as the cytoplasm

Where does more water move?The same amount of water

moves in and outWhat happens to the cell in

a isotonic solution?The cell remains the same

size

Osmosis “Egg”sperimentVinegar has been used to dissolve the shell

of the two eggs1 egg will be placed in fresh water for at

least 24 hoursWhat 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 hoursWhat type of solution is corn syrup?What do you predict will happen to the egg?

Osmosis Eggsperiment2 eggs have had their shells removedThe egg serves as a single cell, although it

technically is not1 egg will be placed in fresh water for 24

hoursWhat type of solution is the fresh water?

1 egg will be placed in corn syrup for 24 hoursWhat type of solution is the corn syrup?

What do you predict will happen?

Directions: WorksheetComplete all 9 questions on the Osmosis and Solutions Worksheet

Use your notes for assistanceCheck with Ms. M when you are done

Osmosis and Solutions WSReview questions 1-9

Catalyst #3: December 6th, 2013 1. What happens to a cell when it is

located in a solution with a lower solute concentration than the inside of the cell?

2. Where does more water move when a cell is in a hypertonic solution?

3. In what type of solution are the cells pictured below?

AgendaCatalyst: 5 minutesOsmosis Eggsperiment, part 2: 10 minutesOsmosis Partner Relay: Remaining

Homework: Study for Osmosis quiz!

Announcements

Unit 5.2: Guiding QuestionsHow 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?

Today’s SPI & ObjectivesSPI 3210.1.7 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 osmosisSWBAT define hypotonic, hypertonic, and

isotonic solutions and predict the effect of each solution on a cell

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?

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….