Question

when brown iodine is exposed to starch it turns dark purple. in an experiment, you placed a cornstarch solution in a small plastic bag. next, you placed the bag in a beaker of water containing 10 drops of iodine. if the solution in the plastic bag turned dark purple (select all that apply)
check all that apply
the plastic bag was permeable to cornstarch.
the plastic bag was permeable to iodine.
the iodine moved into the plastic bag.
the cornstarch moved into the beaker.
the plastic bag was selectively permeable.

Explanation:

Iodine outside the bag diffused into the bag to react with cornstarch, turning the solution dark - purple. This indicates that the plastic bag was permeable to iodine and iodine moved into the bag. Selective permeability means some substances can pass through while others cannot. Since iodine passed through but we don't have evidence of cornstarch passing out, it suggests selective permeability. There is no evidence that the bag was permeable to cornstarch or that cornstarch moved into the beaker.

Answer:

the plastic bag was permeable to iodine.
the iodine moved into the plastic bag.
the plastic bag was selectively permeable.