Diffusion and Osmosis Notes

• Objective: Students will provide a real life example in order to describe the processes of diffusion and osmosis.

• NEXT! Set up a note page for “OSMOSIS and DIFFUSION”

• Answer 1-3 Below at the top of your note page:Aishaya is baking cookies in the kitchen on the first level of

her house. Her sister is sitting at the kitchen table, and her brother is upstairs in his bedroom. Aishaya opens the oven door to check on the cookies.

1. Which member of the family will smell the delicious cookies first?

2. Which member of the family will smell the cookies last?

3. Why do you think this is?

What do you already know about osmosis and diffusion?

1. Which member of the family will smell the delicious cookies first?

2. Which member of the family will smell the cookies last?

3. Why do you think this is?

Smelly Perfume

• Raise your hand when you smell the beautiful fragrance!

Smelly Perfume

Smelly Perfume

Smelly Perfume

Smelly Perfume

Smelly Perfume

Smelly Perfume

EQUILIBRIUM!

Start your notesWhat is a concentration gradient?• CONCENTRATION GRADIENT:– A concentration gradient occurs where the

concentration of something changes over a certain distance.

What is a concentration gradient?

• CONCENTRATION GRADIENT:– A concentration gradient occurs where the

concentration of something changes over a certain distance.

What is a concentration gradient?

• CONCENTRATION GRADIENT:– A concentration gradient occurs where the

concentration of something changes over a certain distance.

What is diffusion?

• DIFFUSION:– the movement of particles down a concentration

gradient from an area of high concentration to an area of low concentration

Is diffusion active or passive transport?

Passive! It does not take energy!

BRAINSTORM Don’t write….What are other examples of

diffusion?• Perfume• Baking cookies

Write your explanation in your notes under the heading Paper

Towel Diffusion/Osmosis!

Paper Towel Diffusion Osmosis!Take a break from notes… 1. Get a pipette, water and some paper towel.2. Drop about 5 drops onto the paper towel. (Leave enough dry towel to clean up.)3. What happens? How is this an example of diffusion?

Back to Notes!What is osmosis?

• OSMOSIS:– The movement of WATER down a concentration

gradient from high concentration to low concentration.

Is Osmosis active or passive transport?

Passive! It does not require energy!

What is the difference between solute and solvent?

• Solute is the stuff that is being dissolved. • Solvent is the liquid that dissolves the solute.• Example: Water (solvent) dissolving salt

(solute).Koolaid=SOLUTEWater=SOLVENT

Set Up A Piece of Paper for our next lab“RAISIN LAB”

Scientific Question: What will happen to a raisin that is left in water over night?

Hypothesis: If I leave a raisin in water then…Variables and Procedures:List to my directions! Write out the procedure in

your own wordsIndependent Variable:Dependent Variable:Control:

Procedure

• Fill your beaker with enough water to cover the raisin.

• Weigh your raisin using the digital scale.

• Measure your raisin using a ruler.

• Leave the raisin in over night to see what happens.

Quantitative Data CollectionWeight of Raisin (scale)

Width of Raisin (ruler)

First Day

Second Day

Qualitative Data CollectionRecord observations about your raisin.Day 1Day 2

Exit Quiz

• Basic Recall• Make sure you know these words!!– Osmosis– Diffusion– Active Transport– Passive Transport– Solute– Solvent

Extra Slides Below

Set Up A Piece of Paper for our next lab“RAISIN LAB”

• USE GLOVES!!!– Remove egg CAREFULLY– Dry it off CAREFULLY– Weigh it on the balances using a coffee filter– Record the egg’s weight and any other

observations– Refill the beaker with fresh vinegar– Cover your beaker with plastic wrap – Place your beaker back on the shelf!

Egg-Speriment!• Fill out the following:– Materials List– Procedure for Days 1 and 2– Results for Days 1 and 2

• Determine the following:– What is a creative title for your experiment?– YOU DO NOT NEED TO FILL OUT ANY OTHER

PORTIONS OF THE GUIDED LAB HANDOUT!

Agenda

• Smelly Perfume!• Concentration Gradients, Diffusion,

Osmosis• Revisit: “Egg-Speriment!”• Prove You Know It

Before you leave today…• Turn in: –Drill/PYKI Sheet– “When Cells Stop Working”

• Receive:–Returned Papers from Ms. Yassin!

• Homework:–Makeup Work!

***DO NOT USE YOUR NOTES!***

• What is diffusion?

• What is the difference between DIFFUSION and OSMOSIS?

• Turn in your “When Cells Stop Working” homework!