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Solutions tend to move from areas of high concentration to areas of low concentration. So if a bag is permeable to starch, the starch will rush into the bag.

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What does the water represent on visking tubing?

In experiments using Visking tubing (dialysis tubing), water typically represents the solvent in which solutes are dissolved. It serves as a medium for demonstrating osmosis and diffusion, illustrating how substances move across a semi-permeable membrane. The movement of water into or out of the tubing simulates the processes of nutrient absorption and waste removal in biological systems. This helps visualize how concentration gradients influence the movement of molecules.


Why are don't starch molecule pass through partially permeable molecule?

Starch molecules are large polysaccharides composed of numerous glucose units, making them too big to pass through the pores of a partially permeable membrane. These membranes allow the passage of smaller molecules like water and certain solutes but act as barriers to larger macromolecules. As a result, starch remains confined to one side of the membrane, while smaller molecules can move freely. This selective permeability is crucial for maintaining cellular homeostasis.


What process caused the yellow salt water to move out from the dialysis tubing into the cup?

The movement of yellow salt water out of the dialysis tubing into the cup is due to osmosis, a process where water molecules move across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration. In this case, if the cup contains a lower concentration of solutes compared to the yellow salt water inside the tubing, water will flow out to equalize the solute concentrations on both sides of the membrane. This process continues until equilibrium is reached or until the concentration gradient is sufficiently reduced.


What membrane that allows only some materials to move in and out of the cell is?

Such a membrane is said to be selectively permeable or semi-permeable.


What results would you expect of the experiment started with a glucose and IKI solution inside the bag and only starch and water outside?

The IKI Is small so the pores of in the bag allow it to go throuch but the starch is to big. So based on the size of the molecules, the glucose and IKI would move out of the bag, the water in, and the starch left in the beaker.


What would happen to an experiment if iodine was put in dialysis bag?

If iodine is placed in a dialysis bag, it will diffuse out of the bag into the surrounding solution, assuming the solution does not contain iodine. This is because the dialysis bag is typically permeable to small molecules like iodine, allowing it to move from an area of higher concentration (inside the bag) to lower concentration (outside). If the surrounding solution contains starch, a color change to blue-black will occur, indicating the presence of iodine, as iodine forms a complex with starch. If there is no starch, the iodine will simply diffuse into the solution without any observable reaction.


Does lactose move across dialysis tubing?

yes, because it is a simple carbohydrate


Give example of visking tube?

A Visking tube, also known as dialysis tubing, is a semi-permeable membrane often used in experiments to demonstrate osmosis and diffusion. For example, in a classroom setting, a Visking tube can be filled with a sugar solution and submerged in plain water. Over time, water molecules will move into the tube through the membrane, causing the sugar solution to become more dilute and illustrating the principles of osmosis. This setup effectively shows how substances can move across selectively permeable membranes.


What makes the cell membrane selective permeable?

A cell membrane is selectively permeable because it only allows particles to move across them due to different concentrations. Molecules move from areas of low concentration to high concentration.


How do particles move through a permeable membrane according to diffusion?

Yes, that is very true, especially with osmosis (the passing of water through a selectively permeable membrane).


Why urea passes through the dialysis tubing into the dialysis fluid?

Urea passes through the dialysis tubing into the dialysis fluid due to the process of diffusion, where molecules move from an area of higher concentration to an area of lower concentration. The dialysis tubing is semi-permeable, allowing small molecules like urea to cross while retaining larger molecules and cells. As urea accumulates in the blood and reaches a higher concentration than in the dialysis fluid, it diffuses out to achieve equilibrium. This process helps remove waste products from the blood in dialysis treatments.


Why would the water level increase in the capillary tube during the investigation because of osmosis?

The water level increases in the capillary tube due to osmosis because the concentrated sugar solution in the dialysis tubing creates a lower concentration of water molecules inside the tubing. This lower concentration of water inside the dialysis tubing creates a concentration gradient that drives water to move from the beaker outside the tubing into the tubing through osmosis, causing the water level in the capillary tube to rise.