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I. Define the following terms in complete sentences:
II. Suppose that you have an osmosis
apparatus like the one that you used in the exercise. In one side
of the apparatus, there are a 100 mL of solution composed of distilled
water and iodine. In the other side, there is a 10% starch solution.
The liquid levels in both sides are initially the same. Answer
the following questions in complete sentences.
a. What will happen to the level of
the water and iodine solution (Side A)?
b. What will happen to the level of
the starch solution (Side B)?
c. In which direction across the semipermeable
membrane will the water molecules move when the system reaches
equilibrium?
d. What will happen to the color of
the water and iodine solution? Why?
e. What will happen to the color of
the starch solution? Why?
f. (Extra Credit) How many grams of
starch will be present in 100 grams of the 10% starch solution?
III. Often when a person is ill they
must be given fluids intravenously (by injection directly into
the blood vessel). Why must the person never be given pure water
intravenously? Be sure to explain your answer in full, using the
concepts of diffusion and osmosis that we have discussed.
IV. Why will a house plant wilt if
it is not watered for several days?
V. In the experiments with the Elodea
and the blood cells, which of the test liquids (distilled
water, tap water, or salt solution) gave similar results? Which
gave different results? Can you explain the difference?
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Science Education Connection Department of Biochemistry The University of Arizona Wednesday, February 12, 1997 johnmcc@dakotacom.net
http://biology.arizona.edu/sciconn/lessons/mccandless/ |
