Dialysis Experiment Observations and Concepts

Mr. Kobe demonstrates a dialysis lab activity, explaining the use of dialysis tubing to understand diffusion and passive transport. The experiment involves glucose and starch solutions in dialysis tubing, submerged in iodine water. Tests are conducted to observe color changes when starch and iodine mix, and glucose presence is checked using test strips. Observations reveal the diffusion of molecules through the dialysis tubing, helping students answer lab questions.

What is the primary purpose of using dialysis tubing in this lab activity?

• To test the permeability of molecules

• To change the color of solutions

• To observe the effects of heat on liquids

• To measure the volume of liquids

What is the total volume of the mixture added to the dialysis tubing?

• 20 milliliters

• 5 milliliters

• 10 milliliters

• 15 milliliters

What color change occurs when iodine is added to starch?

• Red

• Blue

• Black or deep purple

• Yellow

What does a green color on the glucose test strip indicate?

• A small amount of glucose present

• A large amount of glucose present

• No glucose present

• Presence of starch

What is the main question the experiment aims to answer regarding the dialysis tubing?

• Can molecules pass through the tubing's pores?

• How does temperature affect diffusion?

• How fast can water evaporate?

• What is the boiling point of glucose?

What observation was made about the color inside the dialysis bag after the experiment?

• It turned red

• It turned blue

• It remained unchanged

• It turned black

What was the observation regarding the iodine water after the experiment?

• It turned black

• It turned green

• It evaporated

• It remained the same color

What does the color change in the glucose test strip suggest about the solution outside the dialysis bag?

• All glucose diffused out

• Starch diffused out

• No glucose diffused out

• Some glucose diffused out

What is the significance of the black color inside the dialysis bag?

• It indicates the presence of starch

• It indicates the presence of iodine

• It indicates the presence of water

• It indicates the presence of glucose

What conclusion can be drawn from the unchanged color of the iodine water?

• Iodine did not enter the dialysis bag

• Iodine reacted with glucose

• Iodine evaporated

• Iodine turned into a solid