Osmosis Flashcards
Osmosis Definition:
Is the movement of water across a semi-permeable membrane from a region with a high concentration to a low concentration.
What is a semi-permeable membrane?
It can only let tiny molecules in and out like water but can not let big molecules get through like sucrose .
Why can water molecules pass in and out of the semi-permeable membrane?
Because water molecules move randomly during osmosis all the time.
In what direction would the net flow go?
It would go in the direction where there are are few molecules present of that molecule to make it “even”.
What is a Dilute solution?
Contains a high concentration of the solvent (water) and low concentration of the solute (sugar)
What is a Concentrated solution?
It contains a low concentration of solvent and a high concentration of solute.
What is an Isotonic solution?
When the concentration in the cell is the same as the internal conditions.
What is a Hypertonic solution?
Where the concentration outside the cell is higher than the internal conditions.
What is a Hypotonic solution?
Where the concentration of solutes outside the cell is lower than the internal conditions.
What happens when a cell uses up water in chemical reactions?
The cytoplasm becomes more concentrated.
When red blood cells becomes hypertonic what happens to the cell?(when water goes into it and there is a higher concentration outside the cell)
The red blood cell will shrivel up and no longer survive.
When a red blood cell becomes hypertonic what does it do? and give reasons.
It will burst because there is too much water inside the cell and there is no wall from protecting it from bursting.
Define Turgid
Swollen from water intake by osmosis in plants and can not take anymore, they become rigid therefore making the plants rigid as well, this is normal.
Explain how plant cells become turgid: Explain how this happens:
1) Water moves into the plant cell by osmosis.
2) Vacuole swells and presses cytoplasm against the cell wall then pressure builds
3) Makes cells rigid, therefore makes plants rigid.
Define Flacid:
Where the cells become soft as there is no pressure on the walls, therefore the plant begins to wilt.
