Question

when brown iodine is exposed to starch it turns dark purple. in an experiment, you placed a cornstarch and glucose solution within a small plastic bag. next, you placed the bag in a beaker with water and 10 drops of iodine. after 10 minutes, the solution in the bag turned dark purple and glucose could be found in the iodine water within the beaker. select all that apply. check all that apply the iodine moved into the plastic bag the cornstarch moved into the beaker iodine and glucose have a smaller molecular size than cornstarch cornstarch has a smaller molecular size than iodine or glucose the plastic bag was selectively permeable

Explanation:

Starch turns dark - purple in the presence of iodine. Since the solution in the bag turned dark - purple, iodine moved into the plastic bag. Glucose could be found in the beaker, indicating that glucose moved out of the bag into the beaker. Starch did not move out as the beaker solution did not turn dark - purple. A selectively permeable membrane allows some substances to pass through while restricting others. Iodine and glucose have smaller molecular sizes than starch, which is why they can pass through the selectively - permeable plastic bag while starch cannot.

Answer:

• The plastic bag was selectively permeable
• Iodine and glucose have a smaller molecular size than cornstarch
• The iodine moved into the plastic bag