Date: November 24, 2015

Aim #30: How does osmosis and diffusion compare?

HW: 1) Cell Web Quest due Tuesday 12/1 2) QUIZ- Tuesday/Wednesday (Aim #’s 24-26)3) Unit 3 Test- Monday (12/7)/Tuesday (12/8)

Do Now: Warm-Up NotebookDate Title of Activity Page #11/24 Cellular Transport 2 53

Date: November 25, 2015

Aim #30: How does osmosis and diffusion compare?

HW: 1) Cell Web Quest due Tuesday 12/1 2) Microscope Lab due next week!3) Unit 3 Test- Monday (12/7)/Tuesday (12/8)

Do Now: Warm-Up NotebookDate Title of Activity Page #11/25 Plant vs. Animal Cells 54

Aim #30: How does osmosis and diffusion compare?

What is the diffusion of water

called?

Osmosis

What is meant by concentration?

Distilled water100% pure water

What happens when we add a SOLUTE like salt or sugar?

Solvent: The liquid (ex. Water)

Solute: The solid added to the liquid (salt/sugar)

3) Concentration Differences:

a) A 90% salt solution vs. a 20% salt solution

i. Which solution has more salt particles?

ii. Which solution has more water molecules?

b) A 60% salt solution vs. 80% salt solution?

i. Which solution has more salt particles?

ii. Which solution has more water molecules?

90% Salt Solution

20% Salt Solution

80% Salt Solution

60% Salt Solution

Which container has a greater concentration of water molecules?

= Solute (salt) = Solvent (water)

Which container has a greater concentration ofsolute molecules?

In which direction is osmosis going to occur?

= Solute (sugar) = Solvent (water)

Selectively Permeable

Why does this happen?

Why are the water molecules diffusing to the left?

Water molecules are red

4) What is a hypotonic solution?

• Contain a low concentration of solute relative to another solution (e.g. the cell's cytoplasm)

• When a cell is placed in a hypotonic solution, the water diffuses into the cell, causing the cell to swell

• Example: Red Blood Cell in Distilled Water

5) What is an isotonic solution?

• Contain the same concentration of solute as an another solution (e.g. the cell's cytoplasm)

• When a cell is placed in an isotonic solution, the water diffuses into and out of the cell at the same rate

• Example: The fluid that surrounds the body cells

6) What is a hypertonic solution?

• Contain a high concentration of solute relative to another solution (e.g. the cell's cytoplasm)

• When a cell is placed in a hypertonic solution, the water diffuses out of the cell, causing the cell to shrink

• Example: elodea in salt water

Will osmosis happen?

In which direction will osmosis happen?

What was in the solution that made this happen to the cells?

How is osmosis a form of passive transport?

Osmosis is the movement of water from an area of high concentration to an area of

low concentration. No ATP needed.

Amoeba Sisters Video (9:27)https://www.youtube.com/watch?v=IaZ8MtF3C6M