U2T8 – Osmosis

Osmosis

1 / 16

What type of transport is osmosis?

Active Transport

Diffusion

Something else.

2 / 16

Is a higher water potential...

More free water molecules than another solution.

Fewer free water molecules than another solution.

3 / 16

What is the water potential of pure water?

-1 kpa

+1 kpa

0 kpa

4 / 16

In the above diagram of three cells, will water move from :

A to B

B to A

B to C

5 / 16

In the above diagram of three cells, will water move from:

B to A

A to C

C to B

6 / 16

Complete this sentence: Osmosis is the diffusion of water across a partially ________ membrane . Type your answer:

7 / 16

When investigating osmosis, why is it better to calculate the percentage change in mass, rather than just the change in mass?

Percentage change is more accurate.

Percentage change is more reliable.

Percentage change takes into account any difference in starting mass.

8 / 16

When investigating osmosis, you often need to make different concentrations of solute solution. Describe how you would make up 30 ml of 0.15 mol dm ^-3,from 1 mol dm ^-3 stock solution.

15 ml of stock, and 85 ml of distilled water.

1.5 ml of stock, and 28.5ml of distilled water.

4.5 ml of stock, and 25.5ml of distilled water.

9 / 16

A worm native to fresh water will die when placed in sea water. Why is this?

Water will move out of the worms tissues due to osmosis.

Water will move into the worm's tissues via osmosis.

There is less oxygen in sea water.

10 / 16

Which of the following is a similarity between diffusion an osmosis?

Both are a movement of a substance across a concentration gradient.

Both are a movement of a substance down a concentration gradient

Both are a movement of a substance along a concentration gradient.

11 / 16

Which of the following is a similarity between diffusion an osmosis?

Both are passive processes.

Both do not use energy.

Both use energy.

12 / 16

Read the above passage. Before reweighing, the potato was blotted dry. Which of the following is NOT a reason for doing this?

To remove excess water which will affect the mass.

Because different amounts of water will be on different pieces of potato.

It removes water.

13 / 16

Look at the above graph, what is the concentration of sodium chloride inside the potato cells?

0.4 mol dm ^-3

0.35 mol dm ^-3

15 mol dm ^-3

14 / 16

In the above experiment, why would the student be advised to take repeat readings?

It makes the results more valid.

It allows anomalies to be identified.

It shows the experiment is reproducible.

15 / 16

In the above experiment, why would the student be advised to take repeat readings?

It makes the results more valid.

It allows anomalies to be identified.

It shows the experiment is reproducible.

16 / 16

Which term describes a solution with a lower water potential than the cells bathed in it?

Hypertonic

Hypotonic

Isotonic

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