Date: November 24, 2015
Aim #30: How does osmosis and diffusion
compare?
Do Now: Warm-Up Notebook
Date
Title of Activity
11/24
Cellular Transport 2
Page #
53
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)
Date: November 25, 2015
Aim #30: How does osmosis and diffusion
compare?
Do Now: Warm-Up Notebook
Date
Title of Activity
11/25
Plant vs. Animal Cells
Page #
54
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)
Aim #30: How does osmosis and
diffusion compare?
What is the diffusion of
water called?
Osmosis
What is meant by
concentration?
Distilled water
100% pure water
Solvent: The liquid (ex. Water)
Solute: The solid added to the liquid
(salt/sugar)
What happens when
we add a SOLUTE
like salt or 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?
90% Salt
Solution
20% Salt
Solution
i. Which solution has more salt particles?
80% Salt
Solution
ii. Which solution has more water molecules?
60% Salt
Solution
Which container has a greater concentration of
water molecules?
= Solute (salt)
= Solvent (water)
Which container has a greater concentration of
solute 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