B2.1.2 - Osmosis Flashcards Preview

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Flashcards in B2.1.2 - Osmosis Deck (17):
1

What is osmosis?

The diffusion of water molecules across a selectively permeable membrane

2

What does osmosis explain?

How water gets in and out of cells

3

What do water molecules do when a solute is dissolved?

They cluster around the solute molecules

4

What is water potential?

The concentration of free water particles

5

What type of water has the highest water potential?

Pure water

6

When will the water potential be low?

When the water is highly concentrated

7

Describe the movement of osmosis using key words

Osmosis is the movement of water molecules from a high water potential to a small water potential

8

What is water potential an example of?

A concentration gradient

9

How do you increase the rate of osmosis?

You increase the difference in water potential
You decrease the difference the particles need to travel
You increase the surface area

10

What is turgor pressure?

The pressure that makes a cell rigid

11

What is a plasmolysed cell?

A cell where the cell contents fall away from the cell wall because it lost its turgor pressure and becomes flaccid

12

What does flaccid mean?

Soft

13

What is lysis?

When a cell takes up too much water, swells and then bursts

14

What happens when you place an animal cell in a lower concentrated solution?

It fills up and swells due to the water goes into it, and may burst

15

What happens if you put an animal cell in a normally concentrated solvent?

Nothing happened

16

What happens if you place an animal cell in a more concentrated solution?

The cell loses water and may become crenated

17

What does crenated mean?

Crinkled