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Iodine is permeable to a plastic bag because the starch's molecules are too large to pass through the bag (starch is a complex sugar made of a large chain of monosaccharides), while the Iodine can pass through since iodine is usually only two Iodine atoms (I2).
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How will you determine whether iodine entered the dialysis bag containing starch?
You can determine if iodine entered the dialysis bag containing starch by performing a simple iodine test. Add a few drops of iodine solution to the bag. If the iodine turns blue or purple, it means that iodine has entered the bag and reacted with the starch inside.
If the tubing was permeable to starch which way would the starch move into the tubing or out of the tubing?
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.
How does iodine get in a bag of corn starch?
I am not quite sure what happens when corn starch and iodine are mixed but when corn starch, iodine and water are mixed, it creates a purple solution. The darkness of the colour mostly depends on the iodine. Without the starch with iodine and water, it is deep yellow or brown.
Why is it not a good idea to store iodine in plastic bag?
Iodine is reactive with plastics and can cause them to degrade, leading to contamination of the iodine and possibly releasing toxic fumes. It is better to store iodine in a glass container to maintain its integrity and prevent any unwanted chemical reactions.
Why is not good idea to store iodine in a plastic bag?
Because iodine is an atom and it can permeate the pores of the plastic bag. Iodine can also be very reactive, so storing it in a plastic bag might cause reactions with other substances... depending on what you put near it.
When a mixture of starch and glucose is put into a bag made from partially permeable membrane and is put in a beaker so after 20 minutes what change will take place in the contents of bag?
After 20 minutes, the glucose molecules will diffuse out of the bag through the partially permeable membrane because they are smaller in size than the starch molecules. The starch molecules, being too large to pass through the membrane, will remain inside the bag.
Is there a reaction between the ammonium hydroxide inside a plastic bag when immersed in a water with phenolphthalein?
Ammonium hydroxide is a base and phenolphthalein is an indicator that changes color in the presence of bases. When the plastic bag containing ammonium hydroxide is immersed in water with phenolphthalein, the indicator will change color (typically pink or purple) due to the reaction between the ammonium hydroxide and the phenolphthalein, indicating the presence of a base.
If iodine can move through a plastic bag why can't you breathe through a plastic bag?
Iodine molecules are much smaller than oxygen molecules, so they can pass through small openings in the plastic bag. However, the plastic bag is impermeable to air, so you cannot get enough oxygen by breathing through it. This can lead to a lack of oxygen and potentially suffocation.
What happens if starch is present in leaf?
Starch presence in a leaf suggests an excess of glucose produced during photosynthesis. This excess is converted and stored as starch, serving as an energy reserve for the plant. Starch accumulation also indicates that the plant is undergoing optimal photosynthesis.
Which substance are entering the bag and which are leaving the bag?
In the process of osmosis, solvent molecules (such as water) move into the bag from the solution outside, while solute molecules move out of the bag and into the surrounding solution to equalize their concentrations on both sides of the semi-permeable membrane.
Is the cell membrane selectively permeable?
Yes, the cell membrane is selectively permeable, meaning it allows certain molecules to pass through while blocking others. This property helps regulate the movement of ions and molecules in and out of the cell, maintaining cellular homeostasis.
Why is a plastic bag selectively permeable?
Plastic bags are not selectively permeable. They are typically impermeable to most molecules and gases due to their dense structure, which prevents substances from easily passing through them.
