data table
solution in baggie | color day 1 | color day 2
solution in cup | amber | clear
conclusions:
1. based on your observations, which substance moved, the iodine or the starch?
2. how did you determine this?
3. the plastic baggie was permeable to which substance?
4. is the plastic baggie semipermeable?
5. sketch the cup and baggie in the space below. use arrows to illustrate how diffusion occurred in this lab. be sure to label the parts of your diagram.
6. what would move, and what color change would take place, if the iodine solution was placed in the baggie and the cornstarch solution was placed in the beaker?
7. why isn’t it a good idea to store iodine in a plastic bag?

Question

Accepted Answer

### Question 1
# Brief Explanations:
Iodine moves (starch in baggie, iodine in cup; baggie turned purple, indicating iodine entered and reacted with starch).
# Answer:
Iodine

### Question 2
# Brief Explanations:
Baggie solution (with starch) turned purple (iodine - starch reaction), so iodine moved into baggie; cup solution cleared (starch didn't move out).
# Answer:
The baggie solution (with starch) turned purple (iodine - starch reaction), showing iodine moved in; cup solution cleared (starch didn’t move out).

### Question 3
# Brief Explanations:
Iodine moved through the baggie (caused starch in baggie to turn purple), so baggie was permeable to iodine.
# Answer:
Iodine

### Question 4
# Brief Explanations:
Only iodine moved (starch didn’t), so baggie allowed some (iodine) but not all (starch) through, so it’s semipermeable.
# Answer:
Yes

### Question 6
# Brief Explanations:
Starch (large? No, wait: Starch is large, iodine small? Wait, in reverse: If iodine in baggie, starch in beaker. Baggie is permeable to iodine? Wait no, earlier baggie let iodine in (from cup to baggie). Wait, starch is large, iodine small. So if iodine in baggie, starch in beaker: Iodine can move out of baggie into beaker? No, wait starch is in beaker. Wait, iodine - starch reaction: starch + iodine → purple. So if iodine in baggie, starch in beaker: Starch is large, can’t move into baggie. Iodine is small, can move out of baggie into beaker? No, wait the baggie’s permeability: earlier it let iodine in (from cup to baggie). So if iodine is in baggie, can it move out? And starch in beaker: can starch move into baggie? Starch is large, so no. So iodine moves out of baggie into beaker? No, wait the beaker has starch. Wait, no: the setup is baggie (iodine) in beaker (starch). So iodine (small) can move out of baggie into beaker, reacting with starch in beaker to turn it purple. Starch (large) can’t move into baggie. So what moves? Iodine moves out of baggie into beaker. Color change: beaker (starch + iodine) turns purple; baggie (iodine leaving) – if baggie had only iodine, maybe no color (but iodine is amber? Wait earlier iodine was amber (cup day 1: amber). So baggie (iodine) – when iodine moves out, baggie solution (iodine) becomes less, but starch can’t move in. Wait, maybe I got it reversed. Wait original: baggie had starch (white), cup had iodine (amber). After: baggie purple (starch + iodine), cup clear (iodine left? No, cup was amber, became clear? Wait no, maybe starch was in baggie, iodine in cup. Iodine moved into baggie (starch + iodine → purple), cup lost iodine (became clear). So iodine is small, starch large. So in reverse: baggie has iodine (amber), beaker has starch (white). Iodine (small) can move out of baggie into beaker. Starch (large) can’t move into baggie. So in beaker: starch + iodine → purple. In baggie: iodine leaves, so baggie solution (iodine) becomes less, but no starch. So what moves? Iodine moves from baggie to beaker. Color change: beaker turns purple, baggie (iodine) – if baggie had iodine (amber), when iodine moves out, maybe baggie solution becomes clearer (but iodine is amber, so less iodine → lighter amber? But the key is: starch can’t move into baggie, iodine can move out. So the substance that moves is iodine (from baggie to beaker), and the beaker (starch) turns purple.
# Answer:
Iodine would move (from baggie to beaker). The beaker (with starch) would turn purple (iodine - starch reaction); the baggie (iodine) would show no starch - related color change (starch can’t enter baggie).

### Question 7
# Brief Explanations:
Plastic baggie is permeable to iodine (from Q3), so iodine would diffuse out of the baggie, leading to loss of iodine (ineffective storage).
# Answer:
The plastic baggie is permeable to iodine (as seen in the lab), so iodine would diffuse out of the bag, causing it to be lost (making it a poor storage choice).

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