Chapter 4: What was the diffusion lab about?

• The diffusion of carbon dioxide and water

• The diffusion of iodine, starch, and glucose

• The diffusion of carbon dioxide, oxygen, and water

• The diffusion of starch and glucose

Chapter 4: Define media

• The membrane through which osmosis occurs

• The membrane through which diffusion occurs

• Substance through which diffusion occurs, such as water and air

• Substance through which osmosis occurs, such as water and air

Chapter 4: Define solute

• The substance dissolved in a solution

• The substance created in a solution

• The substance that there is most of in a solution

Chapter 4: In diffusion...

• Molecules move from isotonic conditions.

• Molecules move from an area of higher concentration to an area of lower concentration.

• Molecules move from an area of lower concentration to an area of higher concentration.

Chapter 4: Define solvent

• The substance through which diffusion occurs

• The substance that there is most of in a solution

• The substance created in a solution

• The substance dissolved in a solution

Chapter 4: How are you going to determine if iodine and/or starch diffuse across the dialysis tubing?

• If both iodine and starch are able to diffuse across the membrane, both the dialysis tubing and the beaker will look dark purple.

• If only starch is able to diffuse across the membrane, the solution in the dialysis tubing will look dark purple.

• If only iodine is able to diffuse across the membrane, the solution in the dialysis tubing bag will look dark purple.

Chapter 4: Did diffusion across the membrane occur for the iodine solution?

• No

• Yes

Chapter 4: Did diffusion across the membrane occur for the starch solution?

• No

• Yes

Chapter 4: Did diffusion across the membrane occur for the glucose solution?

• No

• Yes

Chapter 4: What can you conclude about the diffusion of iodine, glucose, and starch across the selectively permeable dialysis tubing membrane?

• Diffusion occurred with iodine and glucose because their molecular movement is less than that of starch.

• Diffusion occurred based on molecular size. Iodine and glucose are much smaller molecules than starch; therefore, they were able to diffuse.

• Diffusion occurred with iodine and glucose because the dialysis tubing membrane contained channels for those molecules.