When orange iodine is exposed to starch it turns blue-black. In an experiment, you placed a cornstarch solution in a small plastic bag. Next, you placed the the bag in a beaker of water containing 10 drops of iodine. If the solution in the plastic bag turned blue-black (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.
Added by Tammy R.
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The cornstarch solution turned blue-black, which means iodine came into contact with the cornstarch. Show more…
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In this lab, you will observe the diffusion of a substance across a selectively permeable membrane. The plastic bag is selectively permeable like a membrane, allowing smaller molecules to pass. Iodine is an indicator for starch and will turn from reddish brown to dark black in the presence of starch. Pre-lab questions: - What is in the plastic bag? - What color is it? - What is in the cup? - What color is it? - What do you predict will happen to the iodine and cornstarch molecules? (Hypothesis) How is the plastic bag similar to a cell membrane? Post-lab questions: - What is in the plastic bag? - What color is it? - What is in the cup? - What color is it? - Which molecule(s) diffused across the membrane? Explain your answer. - Is this active or passive transport? - How did you know?
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