+Catalyst: (pg. 44)What’s the difference between something that is permeable and something that’s impermeable??

+Agenda Catalyst PermeabilityCell membrane

Objectives Explain selective permeability in reference to the cell membrane

Identify the parts of the phospholipid bilayer

+Permeability Permeable– Allows any substance to pass through Impermeable- does not allow any substance to

pass through Selectively permeable- Some substances make it

through others get stopped

With a partner discuss which type of permeability will most likely be experienced in your cells. Use an example to explain why you are confident in your choice.

+Cells and Permeability Cells are SELECTIVLY PERMEABLE Its important that they don’t just let anything get

access to the organelles or your DNA What sorts of things shouldn’t be allowed into your

cells? Viruses, bacteria or other things that make you sick Ions- charged particles can damage cells

What sort of things should your cells allow inside? Water Food molecules (proteins, lipids and carbohydrates) Salts Vitamins and Minerals

+Cell membrane

The cell membrane is the organelle that allows the cell to be SELECTIVLY PERMEABLE

The cell membrane is called the PHOSPHOLIPID BILAYER

+Phospholipid Bilayer

+Homework

READ & TAKE NOTES on “Membranes” essay pg. 220-221

DEFINE vocabulary in essay PG. 45 of your notebook

+

+Phospholipid Bilayer

+

+Catalyst: (Pg. 46)What is the full scientific name of the cell membrane?

AgendaCatalyst Finish membranes Molecular movement Objectives: SWBAT Explain how diffusion and osmosis move

molecules across the cell membrane.

+

+Phospholipid Bilayer Video

http://www.youtube.com/watch?v=moPJkCbKjBs

+Molecular Movement You will be divided up into groups and given a quote.

With your group discuss the meaning of the words in the quote.

Annotate the quote on the paper, write down any questions you have about words or meaning.

Find the quote in your text and read the paragraph that it’s found in to gain context.

Write a Summary of what your group thinks your quote means on the paper with your quote.

+Gallery walk Glue the small sheet with all of the quotes onto pg. 46 of your notebook, in the corner against the binding.

Walk around the room and look at what other groups said about their quotes.

Summarize the quote in your notebook on pg. 46

+

Catalyst: pg.47 (insert solvent and solute to complete the sentence.) When making lemonade from a mix the powder is the ___________ while the water is the ____________.

Solute

Solvent Solute = what gets dissolved Solvent = what does the dissolving (almost always water)

+AgendaCatalyst Molecular movement Diffusion vs. OsmosisPractice Objective: SWBAT Predict the direction of water movement across a membrane

+Diffusion- particles move from high concentration to low concentration until they are equal

Both solute & solvent move in diffusion

+Diffusion of perfume in air

Classroom Particles diffuse throughout the room

+Diffusion of glucose in a animal cell (glucose = solute )

Cells Internal Environment

Cells External Environment

Glucose will diffuse out of the cell

+Osmosis Osmosis is a type of diffusion. WATER is the particle that moves in osmosis. ONLY SOLVENT MOVES

Water moves to equal out the CONCENTRATION of SOLUTE

Water moves into the cell

+Osmosis The movement will continue until the concentration of SOLUTE is EQUAL

Cells Internal Environment

Cells External Environment

25% glucose75% water

25% glucose75% water

+Osmosis of a cell in salt water

Cells Internal Environment

Cells External Environment

25% NaCl75% H2O

65% NaCl35% H2O

Water will leave the cell to go wherever there is more solute

+Diffusion vs. Osmosis

+Diffusion worksheet will get TURNED IN AT THE END OF CLASS and graded for ACCURACYThe LEFT side deals with DIFFUSION

The RIGHT side deals with OSMOSIS

Complete all 16 questions (8 on each side)

+Tomorrow you will submerge a egg into a 20%, 40%,60%, 80% and 100% solution of corn syrup, as well as pure water.

Predict what will happen to the mass of each egg in each solution. (6 sentences)

Ex: The egg in the water will gain mass because…..

Note: start with the pure water and 100% corn syrup predictions. You should be able to figure those out…

+Catalyst: SILENTLY answer the 7 pre-lab questions on the front of your lab sheet

AgendaPre-lab questions Data table Lab Procedures and set upObjective Conduct a controlled experiment to determine how the amount of solute effects the amount of osmosis.

+In your lab groups… LABEL the cups

Group initials or group number Type of solution going in the cup Initial Mass of the egg in the cup (filled in later)

Prepare your three solutions using the BEAKERS and pour them into their corresponding labeled cup. LOOK AT YOUR GROUPS SIGN FOR YOUR ASSIGNED SOLUTIONS

Get three eggs for your group. Record the initial mass for each egg both on

the data table AND on the cup it goes in. Place your eggs in the back of the room as

directed.

+Catalyst: (Top of pg. 51) What is the difference between a dependent and independent variable in an experiment. (Talk to a partner, come up with a collective answer)

+Agenda

Catalyst

Notebook organization

Pre-lab questions

Final mass measurements and Lab Clean-up

Class data table

Objective: SWBAT Conduct a controlled experiment to determine how different solutions effect the rate of osmosis

+What page are we on? pg. 46 – Molecular Movement notes & or Quotes

pg. 47 –Diffusion and Osmosis notespg. 48-Diffusion and Osmosis notes & lab predictions

pg. 49- Egg-speriment Lab Data tablePg. 50- Egg- speriment Lab sheet pg. 1Pg. 51- Egg- Speriment Lab sheet pg. 2

+With you lab group… Carefully go to the back and collect your cup.

DO NOT DISTURB OTHER EXPERIMENTS! GENTLY remove the egg from the cup and

rinse it off under running water. x3 Record the final mass of your eggs on your

data table. Carefully place the eggs in the trash can. DO

NOT POP THEM! Clean the cups with soap and water and

remove the tape Stack clean cups in the back by the sinks

+Solution Initial Mass of egg (g) grams

Final Mass of egg (g) grams

Vinegar Solution

Tap Water 85.9 94.9

20% Corn Syrup

40% Corn Syrup

60% Corn Syrup

80% Corn Syrup

100% Corn Syrup

+Graph Set up… PG. 52 This will be a BAR GRAPH Y-axis= dependent variable & X-axis = Independent

variable Y-axis = Mass of the egg (grams) X-axis = Different solutions y-axis number intervals? 5, 10, 15? ALWAYS START AT 0….NO EXCEPTIONS…..EVER You will have 2 bars for each solution one bar for initial

mass and one bar for final mass

+

+Red blood cells in 3 solutions