Diffusion and Osmosis Worksheet 2

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Chapter 3 The Cell

1. Circle the correct answer.

a) When red blood cells are placed in an isotonic solution they:
swell / stay the same / shrink.
b) Red blood cells are isotonic to:
distilled water / 0.2% salt solution / 0.9% salt solution / 2.0% salt solution.
c) Red blood cells placed in a 2.0% salts solution would:
swell / stay the same / shrink.
d) Red blood cells placed in distilled water would:
swell / stay the same / shrink.
e) When red blood cells are placed in distilled water:
the water enters the cells / the water leaves the cells / the water does not move / the salts in the cells leave the cells
f) Red blood cells placed in a 0.9% salt solution would:
swell / stay the same / shrink.
g) Red blood cells placed in distilled water are in a:
hypertonic / isotonic / hypotonic solution.
h) Red blood cells placed in 0.9% salt solution are in a:
hypotonic / isotonic / hypertonic solution.
i) Red blood cells placed in a 2.0% salt solution are in a:
hypotonic / isotonic / hypertonic solution.
j) A dialysis bag (made of an artificial semi-permeable membrane) filled with 0.5% salt solution and placed in a beaker containing 3.0% salt solution will:
swell / stay the same / shrink.

2. Three bottles are filled with three different solutions. One with distilled water, one with 0.9% salt solution and the third with 9.0% salt solution. A few dried apricots are placed in the three bottles and left in the solutions for an hour.

The apricots in bottle A stay the same.
The apricots in bottle B shrink
The apricots in bottle C swell.

Now answer the following questions:

i) Which bottle contains the most concentrated salt solution? A B C
ii) Which bottle contains water? A B C
iii) Which bottle contains the isotonic salt solution? A B C
iv) Which bottle contains the hypotonic solution? A B C
v) Which bottle contains the hypertonic salt solution A B C

3. Now try this one!

A semi - permeable membrane (dialysis) bag, containing 4% salt, 4% glucose and 4% albumin is suspended in distilled water. Assume the bag is permeable to all substances except albumin.

Image:Semipermeable membrane bag experiment 2.JPG


Circle the correct answer in the statements below.

(Note that salt has quite a small molecule, glucose has a moderate sized molecule and albumin is a protein with a very large sized molecule.)

a) The salt: moves into the bag / moves out of the bag / does not move
b) The water: moves into the bag / moves out of the bag / does not move
c) The albumin: moves into the bag / moves out of the bag / does not move
d) The glucose : moves into the bag / moves out of the bag / does not move
e) The salt moves by: diffusion / osmosis / active transport / it does not move because the molecules are too large.
f) The water moves by: diffusion / osmosis / active transport / it does not move because the molecules are too large.
g) The albumin moves by: diffusion / osmosis / active transport / it does not move because the molecules are too large.
h) The glucose moves by: diffusion / osmosis / active transport / it does not move because the molecules are too large.


Diffusion and Osmosis Worksheet 2 Answers

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