Osmosis and Diffusion Practice - Mr. Aragon
Osmosis and Diffusion Practice Name:
I. Based on what you’ve learned, in your own words, answer the following questions regarding movement of materials through a cell membrane. DO NOT COPY and PASTE!!!
1. What does semi-permeable mean? **
2. What is the net movement of molecules from high to low concentrations? **
3. What is the term for the diffusion of water? **
4. What does dynamic equilibrium mean? **
5. What is a hypertonic solution? **
6. What is a hypotonic solution? **
7. What is an isotonic solution? **
II. Observe the diagrams in the table below. Assume that the dots are dissolved particles on either side of the cell membrane. They are like oxygen molecules that can go across the membrane. Do the following situations represent concentration gradients? If so, in which direction would diffusion occur?
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| | | |
| | | |
|gradient? |** |gradient? |** |gradient? |** |
|Yes or No | |Yes or No | |Yes or No? | |
|movement |** |movement |** |movement |** |
|left, right, or none | |left, right, or none | |left, right, or none | |
III. Observe the diagrams in the table below. Assume that the dots are dissolved particles (like
protein or carbohydrate molecules) on either side of the cell membrane. Do the following situations represent concentration gradients? If so, in which direction would osmosis occur?
| | | |
| | | |
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| | | |
| | | |
| | | |
| | | |
|gradient? |** |gradient? |** |gradient? |** |
|Yes or No | |Yes or No | |Yes or No? | |
|movement |** |movement |** |movement |** |
|left, right, or none | |left, right, or none | |left, right, or none | |
IV. Observe the table below. Are the following hypotonic, hypertonic, or isotonic solutions? Which way will water mostly move? (some situations may have water moving equally)
|intracellular fluid |extracellular fluid |Hypotonic, |water moves mostly |
|(inside the cell) |(outside of the cell) |Hypertonic, |inside or outside the cell |
| | |Isotonic | |
|5% salt |10% salt |** |** |
|10% salt |10% salt |** |** |
|3% glucose |1% glucose |** |** |
|2% protein |1% protein |** |** |
|9% salt |9% salt |** |** |
|13% water |25% water |** |** |
|59% water |45% water |** |** |
|90% water |92% water |** |** |
|74% glucose |87% glucose |** |** |
V. Observe the diagram below and answer the questions.
[pic]
1. Can you tell if the cell is in a hypertonic, hypotonic, or isotonic solution? EXPLAIN!
**
2. What will happen to the cell if it is placed in a 50% salt solution?
**
3. What will happen if the cell is placed in pure water?
**
OSMOSIS WORKSHEET
Below are animal cells placed in beakers of various concentrations.
1. Draw an arrow to show which way the water would move by osmosis
2. Identify the type of solution (hypertonic/hypotonic/isotonic)
-----------------------
40% H2O
60% Solute
90% H2O
10% Solute
85% H2O 15% Solute
90% H2O 10% Solute
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
45% H2O
55% Solute
75% H2O
25% Solute
80% H2O 20% Solute
75% H2O 25% Solute
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
50% H2O
50% Solute
90% H2O
10% Solute
63% H2O 37% Solute
50% H2O 50% Solute
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
82% H2O
18% Solute
90% H2O
10% Solute
80% H2O 20% Solute
25% H2O 75% Solute
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
The solution is: hypertonic / hypotonic / isotonic
Water will: not move / move into the cell / move out of the cell
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