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Lab 13 Diffusion and Osmosis in Eggs
glossary
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INTRODUCTION In this lab, you will learn about diffusion and
osmosis. After completing this lab (and discussing osmosis and
diffusion in class), you should be able to:
Define diffusion Define osmosis Analyze a given situation and
predict whether diffusion or osmosis will occur Analyze a given
situation and predict which directions particular molecules are
likely to
move Explain the factors that affect the speed at which
diffusion or osmosis occurs
Resources:Wikipedia is an excellent resource for finding
definitions and examples. The ExploreLearning website (earlier this
year, you obtained a username and password) has at least two Gizmos
that can help you learn this process.
Complete the prelab before proceeding further.
http://www.biology-online.org/dictionary.aspmailto:[email protected],[email protected]://en.wikipedia.org/wiki/Diffusionhttp://www.explorelearning.com/
Lab 13 Prelab
Diffusion and Osmosis in Eggs
Name:
Pledge:
AUTHORIZED AID: You may discuss questions with classmates or
other knowledgeable persons before
composing your OWN answer or you may use a source and cite it
appropriately. (8 points)
1. Which types of cells have a cell membrane? (1)
Figure A
Figure B
2. Identify the figures above as either plant or animal cells.
(2)
a. Figure A FORMDROPDOWN
b. Figure B FORMDROPDOWN
3. Which of the following functions is appropriate for the cell
membrane? (1) FORMDROPDOWN
a. Controls the functions of the entire cell.
b. Makes protein.
c. Photosynthesizes.
d. Controls what enters and leaves the cell.
Use the following websites to read about diffusion and osmosis
before answering the next set of questions:
Diffusion: http://en.wikipedia.org/wiki/Diffusion
Osmosis:
http://en.wikipedia.org/wiki/Osmosis#Example_of_osmosis
4. True or False: Diffusion is the movement of molecules from
areas of low concentration to areas of high concentration. (1)
FORMDROPDOWN
a. If necessary, correct this statement to make it true:
5. True or False: Osmosis is a more specific name for the
diffusion of water. (1) FORMDROPDOWN
a. If necessary, correct this statement to make it true:
6. When you've entered all your answers in the form fields,
unprotect this document ("View", "Toolbars", "Forms" - then click
on the padlock). Then, use your drawing tool to draw an arrow that
points to the cell membrane in each of the cell figures above.
(2)
References
"Typical Animal Cell." Biology. 12 Sept. 2006. National Research
Council Canada.29 Jan. 2006 .
"Typical Plant Cell." Biology. 12 Sept. 2006. National Research
Council Canada.29 Jan. 2006 .
dwheelerFile AttachmentLab 13 Prelab.doc
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Lab 13 Diffusion and Osmosis in Eggs
glossary
13.email us
PROCEDURE
PaRt a Design an experiment to test which liquids pass into or
out of the membrane of a chicken egg. Complete this section on your
answer sheet and get approval to do it before setting it up.
Important information: Your egg will remain in each type of
liquid for 24 hours. Your design must include a way to test how
much liquid enters or exits the egg. You should also set up a data
table to collect your data.
PaRt B You and your lab partner will have the opportunity to
choose one liquid to test. Make sure you have your teachers
permission to test the liquid you and your partner choose. Complete
the Materials section of your answer sheet with the names of the
liquids to be tested.
PaRt C You and your partner will be taking measurements of your
egg every day and placing it in a different liquid daily. Make sure
all data is documented on your answer sheet each day.
http://www.biology-online.org/dictionary.aspmailto:[email protected],[email protected]
Lab 13 Answer Sheet
Diffusion and Osmosis in Eggs
Names:
Pledge:
Authorized Aid means you worked TOGETHER to complete this lab
answers were discussed with one another before being typed, both of
you participated in conducting the lab procedures, and any
sources
or pictures are cited appropriately. (25 total points)
Experimental Design and Procedures
Use the research question to complete the experimental
design.
Research Question: What liquids will pass through the membrane
of a chicken egg?
a. Hypothesis (1):
b. Independent Variable (1):
c. Dependent Variable (1):
d. Control (1):
e. Constants (3):
1.
2.
3.
f. Methods (2) Make sure theyre detailed! Remember to include
safety measures..
Materials
liquids to be tested (1): , , ,
egg
container
Parafilm
spoon
balance
graduated cylinder
soap
beaker brush
Results
1. Fill in the following data table (5 pts):
NOTE: All units should be metric (grams and/or milliliters)
Fill in the Independent Variable
Initial Weight of Fill in the Dependent Variable
(units)
Final Weight of Fill in the Dependent Variable
(units)
Difference in Weights of Fill in the Dependent Variable
(units)
Initial Volume of Fill in the Dependent Variable
(units)
Final Volume of Fill in the Dependent Variable
(units)
Difference in Volumes of Fill in the Dependent Variable
(units)
2. Insert graph(s) from Excel here:
NOTE: for help making graphs try:
http://www-ed.fnal.gov/data/lifesci/data/tutorials/excel.shtml
Your graphs will be scored according to the following
criteria:
a. The correct type of graph was chosen for the data presented.
The graph was produced in Excel with appropriate major & minor
divisions of the axes. Both axes are scaled properly (with
divisions that are evenly spaced and make it easy for the reader to
interpret). (1)
b. Both axes are labeled properly (IV & DV on appropriate
axes) with words and units. (2)
c. Graph contains an appropriate title (one with both the IV
& DV in it). (1)
3. Examine your data (both the data table and your graph).
a. According to your data, which liquids pass through the
membrane (into the egg)? Be sure to explain how your data
demonstrates this. (1)
b. Which liquids do not pass through the egg membrane (they may
have caused liquid to leave the egg)? Be sure to explain how your
data demonstrates this. (1)
4. Why did some liquids not pass through the membrane? (1)
5. Did you observe diffusion or osmosis in this lab? Explain
your answer. (2)
6. What errors may have occurred in your experiment? (1)
dwheelerFile AttachmentLab 13 Answer Sheet.doc
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Lab 13 Diffusion and Osmosis in Eggs
glossary
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HOmEwORkDont forget to do your homework!
REFERENCE
Holsinger, Rachel and Debbie Wheeler. Lab 13: Diffusion and
Osmosis in Eggs. Sayre School: Lexington, KY. January 2007.
http://www.biology-online.org/dictionary.aspmailto:[email protected],[email protected]
Lab 13 Homework
Diffusion and Osmosis in Eggs
Name:
Pledge:
AUTHORIZED AID: You may discuss questions with classmates or
other knowledgeable persons before
composing your OWN answer or you may use a source and cite it
appropriately. (15 total points)
Conclusions
1. Explain which direction the water and the salt will move
(either into or out of the dialysis bag) in each of the following
situations:
NOTE: Click here for the definition of solute. You may also find
it helpful to draw a diagram of the dialysis bag in the beaker
along with the salt concentrations to help you decide in which
direction the water (solvent) or salt (solute) will move.
Another helpful resource:
http://www.blobs.org/science/diffusion/index.shtml
a. A dialysis bag of 20% salt solution is placed in a beaker of
4% salt solution. (2)
i. Which direction will the water move? FORMDROPDOWN
ii. The solute (salt)? FORMDROPDOWN
b. A dialysis bag of 0% salt solution is placed in a beaker of
4% salt solution. (2)
i. Which direction will the water move? FORMDROPDOWN
ii. The solute (salt)? FORMDROPDOWN
c. A dialysis bag of 2% salt solution is placed in a beaker of
4% salt solution. (2)
i. Which direction will the water move? FORMDROPDOWN
ii. The solute (salt)? FORMDROPDOWN
d. A dialysis bag of 4% salt solution is placed in a beaker of
4% salt solution. (2)
i. Which direction will the water move? FORMDROPDOWN
ii. The solute (salt)? FORMDROPDOWN
2. Describe a situation in everyday life when diffusion or
osmosis occurs. (2)
3. Making iced tea involves boiling water, adding tea bags to
steep in the hot water, and, eventually, cooling the tea with ice.
Would it be best to add sugar while the water was warm or after it
had cooled? Explain your answer. (1)
4. You forgot to water your garden and notice that the plants
have become wilted and limp.
a. Use the new vocabulary you've learned (osmosis, diffusion,
etc.) to explain what has happened to the plant cells. (1)
b. What will happen to the plant cells if you now water the
plants? (1)
5. A unicellular organism that normally lives in salt water is
transferred to a beaker of fresh water. Explain what will happen to
the cell. Use as many of the following words (appropriately) as you
can: diffusion, osmosis, concentration, solute. (2)
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