Lab 6 Diffusion

Lab 6 Diffusion Name:

As you complete the lab, answer the questions below, when completed save with your name and then attach to the Lab 6 drop box.

Experiment 1: Diffusion through a liquid

1. A concentration gradient affects the direction that solutes diffusion. Describe how a molecules move with respect to the concentration.

2. How does the size of a solute affect the rate of diffusion? Consider the size and shape of a molecule in your response.

3. Does polarity affect the rate of diffusion? Explain your answer using scientific principles.

4. After completing experiment 1, fill out the tables below and answer the questions following:

Table 1: Diffusion Through Liquids

Corn Syrup in mm

Time (sec) Blue Dye

mm Red Dye

mm

10

20

30

40

50

60

70

80

90

100

110

120

Table 2: Diffusion Rate of Dyes in Corn Syrup

Dye Name Molecular Weight Total Distance Traveled (mm) Speed of Diffusion (mm/hr)*

Blue Dye

Red Dye

1. Record your hypothesis from Step 3 here. Be sure to validate your predictions with scientific reasoning.

2. Which dye diffused the fastest?

3. Does the rate of diffusion correspond with the molecular weight of the dye?

4. Does the rate of diffusion change over time? Why or why not?

5. Make your own line graph using your data and insert as .jpg in your report here.

6. Explain the role diffusion plays in this process of getting oxygen to your cells of the human body.

Experiment 2: Concentration gradients and membrane permeability

Table 3: Indicator Reagent Data

Starch + Conrol (color) Starch Negative Control (color) Glucose +

Control (color) Glucose Negative

Control (color)

IKI Solution N/A N/A

Glucose Test Strip N/A N/A

Table 4: Glucose Diffusion

Dialysis Bag after 60 minutes Beaker water after 60 minutes

IKI Solution

Glucose Test Strip

Experiment 2:

Do experiment on Lab 6, Diffusion

Questions...