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)
a) the plastic bag was permeable to cornstarch.
b) the plastic bag was permeable to iodine.
c) the iodine moved into the plastic bag.
d) the cornstarch moved into the beaker.
e) the plastic bag was selectively permeable.

Answer 1

Answer:

b) the plastic bag was permeable to iodine

the plastic bag was selectively permeable

the iodine moved into the plastic bag.

the plastic bag was permeable to cornstarch.

Explanation:

The experimental set up represented the concept of osmosis.That is  the movement of water  molecules from the region of higher  water potential to region of lower water potential through a semipermeable membrane(a  cell membrane which only allows water and certain molecules to pass through,but restrain other molecules through its pores.

Generally potassium iodine test is the standard test for starch.

Therefore, in the question,water moves iodine molecules as iodine solution(from high water potential) to move across the paper bag(semi permeable membrane) to the reach the corn solution.(low water potential,high solute potential).This turns the starch in the corn solution  blue-black/purple.