Name: __________________
```
1. All substances
except water
2. Through air
3. Through water
1. Passive Transport
2. high to low
concentration
3. no energy
4. through a
membrane
-Movement of
WATER
molecules only
1. What materials are transported through the process of diffusion?
All molecules except water
2. What materials are transported through the process of osmosis?
water only
3. Please describe the direction that molecules move during the processes of diffusion and osmosis (HINT: think about
concentration).
They travel from high concentration to low concentration
4. Draw a semi-permeable membrane.
5. Please describe what concentration is in your own words.
Amount of molecules in a certain space
6. What “drives” the process of diffusion? What state are the molecules trying to reach?
The molecules are trying to reach equilibrium
7. We know that the cell membrane is the organelle that allows substances to travel into and out of the cell. We also know
that the cell membrane is “semipermeable,” what does this mean?
Partly holey – some things can penetrate the cell membrane. Others cannot.
8) In which direction will the molecules move?
How many will move before equilibrium is established?
Count total molecules: _______12________
Divide by 2: ____________6_________
How many need to move so that there are an equal number on each side? _____2__________
9) Which molecules will diffuse through the semipermeable membrane? Small only
Show what the molecules will look like in equilibrium
10) Will the cell get larger or smaller? Why – which way will water move? Smaller. The water will move out of the cell, so the cell
shrinks in size.
H2O
H2O
H2O
H2O
H2O
H2O
H2O
H2O
H2O
H2O
H2O