osmosis

Osmosis Experiments

Name_____________________ Class_______________ Date________

1 Complete the following sentences by choosing the correct words from the box.

Osmosis is the movement of ___________ molecules from a ___________ solution to a more _______________ solution through a _____________ _____________membrane.

concentrated dilute impermeablepartially permeable salt sugar water

2 The following experiment was set up to investigate osmosis.

Complete the following statements by choosing the correct word from the brackets:

The level of the solution in the capillary tube would __________( rise / fall )during the experiment.I think this would happen because water would move __________( out of / into ) the tubing because it contains a more ______________( dilute / concentrated ) solution than the surrounding liquid.

© Pearson Education Limited 2001 Longman Foundation Science for GCSE of 3

3 The diagram below shows an experiment that was set up using equal sized pieces of potato. All three were left for a few hours.

a) In which beaker would the potato increase in size? _______

b) In which beaker would the potato decrease in size? _______

c) In which beaker would the potato stay the same size? _______

d) Which part of a potato cell is partially permeable? __________________

e) What happened to the cells of potato C when it was boiled? _____________________________________________________________

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4 In the following questions tick the correct answer and try to explain why you chose I

56 t.

i) If an animal cell is put into water it willswell up and burst stay the same shrink and wrinkle

I think this because _________________________________________________

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ii) If a plant cell is put into water it willswell up and burst become turgid or firm stay the same become flaccid© Pearson Education Limited 2001 Longman Foundation Science for GCSE of 3


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iii) If an animal cell is put into a concentrated salt solution it willswell up and burst stay the same shrink and wrinkle


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iv) If a plant cell is put into a concentrated salt solution it will swell up and burst become turgid or firm stay the same become

flaccid


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5 Ramesh had been learning about osmosis in science.He knew that water moved from a dilute solution to a more concentrated solution.When he was sat in the bath that night he wondered why he didn’t take in water and swell up.

Can you explain why he stayed the same size? [Hint: Look at your definition of osmosis in question 1.]

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© Pearson Education Limited 2001 Longman Foundation Science for GCSE of 3

osmosis

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