Diffusion and Osmosis Worksheet 2 Answers

1. Circle the correct answer.


 * a) When red blood cells are placed in an isotonic solution they: stay the same


 * b) Red blood cells are isotonic to: 0.9% salt solution


 * c) Red blood cells placed in a 2.0% salts solution would: shrink.


 * d) Red blood cells placed in distilled water would: swell


 * e) When red blood cells are placed in distilled water: the water enters the cells


 * f) Red blood cells placed in a 0.9% salt solution would: stay the same


 * g) Red blood cells placed in distilled water are in a: hypotonic solution.


 * h) Red blood cells placed in 0.9% salt solution are in an:  isotonic solution


 * i) Red blood cells placed in a 2.0% salt solution are in a: 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: 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? B


 * ii) Which bottle contains water? C


 * iii) Which bottle contains the isotonic salt solution? A


 * iv) Which bottle contains the hypotonic solution? C


 * v) Which bottle contains the hypertonic salt solution? B

3.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.




 * a) The salt: moves out of the bag


 * b) The water: moves into the bag


 * c) The albumin: does not move


 * d) The glucose: moves out of the bag


 * e) The salt moves by: diffusion


 * f) The water moves by: osmosis


 * g) The albumin moves by: it does not move because the molecules are too large.


 * h) The glucose moves by: diffusion

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