Diffusion and Osmosis Lab Flashcards Preview

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Flashcards in Diffusion and Osmosis Lab Deck (22)
1

Diffusion

The net movement of one substance from an area of higher concentration to an area of lower concentration.

2

Osmosis

Net diffusion of water across a selectively permeable membrane.

3

Dialysis*

Can be used to selectively separate solutes from a solution.

It involves the diffusion of solutes through a selectively permeable membrane.

4

Selective Permeability

Permits the free passage of some molecules and restricts the passage of others.

5

Isotonic Solution

Solutes outside a cell are in equilibrium with solutes inside a cells.

6

Hypotonic Solution

Solutes outside a cell are lower concentration than solutes inside a cell. Thus water enters cell.

7

Hypertonic Solution

Solutes outside a cell are higher concentration than solutes inside a cell. Thus water leaves the cell.

8

What effect does molecular size have on diffusion rate?

Smaller molecules diffuse faster. Larger molecules diffuse slower.

9

What determined the permeability of the dialysis tubing?

Pore size

10

What do you call the difference between an area of high concentration and an area of low concentration?

Concentration Gradient

11

Which dye molecules are larger? MB or PP

Why?

Methylene Blue.

Slow diffusion rate.

12

Isotonicity

Cell not affected

13

Hypertonicity

Water leaving the cell.

Cell is shrinking and dehydrating.

14

Hypotonicity

Water going into the cell.

Cell is swelling and may rupture.

15

Osmosis resulted in net outflow of water from the dialysis bag.

Lost water from the bag into the beaker.

Weighed bag after one hour and it lost 7% weight.

Solution is hypertonic--40% Glucose.

Cell is hypotonic 0% Glucose.

16

Osmosis caused the flow of water into the dialysis bag.

Bag swelled because it gained water from the beaker.

Bag increased in weight by 17%

Solution is Hypotonic--0% glucose

Cell is Hypertonic--40% glucose

17

Which is the hypotonic solution in the figure?

The ECF--extracellular fluid

18

Which solutes were found in the ECF after one hour?

NaCl

Glucose

19

Which way did the water flow in this experiment.

Into the cell.

20

Diffusion means the solutes in the _____ concentration region will move into the region with _____ concentration.

higher

lower

21

When solutes move through a selectively permeable membrane it is called dialysis.

True.

22

Osmosis is the diffusion of _____ through a selectively permeable membrane.

  1. Glucose
  2. NaCl
  3. Water

3. Water