Let’s Go With The Flow

A Review of Osmosis and Diffusion

Last week we discussed the two passive processes known

as osmosis and diffusion.

Let’s see if you remember the difference between the two!

The following picture best describes the process of:

88%

13% 1. Osmosis

2. Diffusion

This diagram is an example of what membrane transport?

Diff

usion

Fac

ilita

ted

di...

Endoc

ytosi

s

Exo

cyto

sis

6% 6%

75%

13%

1. Diffusion

2. Facilitated diffusion

3. Endocytosis

4. Exocytosis

The following diagram represents the process of:

0%

100% 1. Osmosis

2. Diffusion

Why doesn’t the sucrose move???

Both beakers below contain water. Which beaker contains the higher concentration of

water?

50%

19%

31% 1. Beaker one

2. Beaker two

3. Both beakers have the same concentration of water

Beaker One Beaker Two

Solute of some type was added to beaker A. Now which beaker has the

higher concentration of water

Beaker A Beaker B

6%

94%

0%1. Beaker A

2. Beaker B

3. Both contain the same concentration of water.

In order to bring the two beakers “closer” in terms of their concentration of water, you

could…

Beaker A Beaker B

0%

13%

25%

81% 1. Add solute to beaker B

2. Add more water to beaker A

3. Remove some solute from beaker A

4. Add more water to beaker B

This Next Question Is Tricky!

Put Your Thinking Caps On!!!

Let’s assume there are ten solute particles in beaker A. How many solute particles would you add to beaker B in order to create two solutions

with equal concentrations?

19%

75%

6%

0% 1. 10-12 solute particles

2. 1-2 solute particle

3. 3-5 solute particles

4. 8-10 solute particles

Beaker A Beaker B

You are observing a beaker that contains a sugar solution and potato core. Based on the drawing and the concentrations, where is there a higher

concentration of water?

10% solute

5 % solute

88%

13% 1. Inside the potato

2. In the solution surrounding the potato

What is the concentration of water in the potato?

10% solute

5 % solute

0%

0%

100%

0% 1. 100%

2. 90%

3. 95%

4. Not enough information is given

What is the concentration of water in the solution surrounding the potato?

10% solute

5 % solute

0%

100%

0%

0% 1. 100%

2. 90%

3. 95%

4. Not enough information is given

Since there is a higher concentration of water in the solution surrounding the potato,

in which direction will the water flow?

10% solute

5 % solute

0%

0%

100%1. Into the potato

2. Out of the potato

3. In and out of the potato at the same rate

This one is easy. Where is there a higher concentration of water?

95% Water

75% Water

0%

100% 1. In the potato cells

2. In the solution surrounding the cell

This is an example of a ____ solution and the cell will ____ in size:

0%

0%

88%

13%

84% Water

60 % Water

1. Hypotonic; swell

2. Hypertonic; shrink

3. Hypertonic; swell

4. Isotonic; remain the same size

Which of the following is/are true?

84% Water

84% Water

38%

81%

63% 1. An equilibrium has been reached

2. Water is entering and exiting the cells at the same rate

3. The potato will remain the same size

Based on the graph which solutions are hypotonic

20

15

10

5

0

-5

-10

-15

-20

Percent Change

.2 .4 .6 .8 1

Solution Concentration (M)

.2 .4 .8 1

75%

19%13%13%

1. .2

2. .4

3. .8

4. 1

Based on the graph, an isotonic solution would be ___M

0%

31%

69%

0%

0% 1. .25

2. .45

3. .67

4. .75

5. .82

Percent Change

20

15

10

5

0

-5

-10

-15

-20

.2 .4 .6 .8 1

Solution Concentration

(M)

This diagram is an example of what membrane transport?

Diff

usion

Fac

ilita

ted

di...

Endoc

ytosi

s

Exo

cyto

sis

0%

100%

0%0%

1. Diffusion

2. Facilitated diffusion

3. Endocytosis

4. Exocytosis