What makes a dialysis tube suitable for studying diffusion? Select all that apply.
2 points
2
Question 2
2.
What principle is demonstrated in this lab? Select all that apply.
1 point
1
Question 3
3.
What is the indicator of starch when mixed with iodine?
1 point
1
Question 4
4.
If a substance turns into a blue-black color when in contact with iodine, what does this indicate?
3 points
3
Question 5
5.
The solution has more solute
The cell has more solute
The cell and solution are the same
Hypotonic solution
Hypertonic solution
Isotonic solution
1 point
1
Question 6
6.
What happens to our cells when we drink too much salt water?
1 point
1
Question 7
7.
What is the process that occurs when a cell shrinks due to an extreme amount of salt?
4 points
4
Question 8
8.
Back to the experiment: Use image to answer the questions below.
Beaker
Tube
Which is more concentrated in starch?
Which is more concentrated in iodine?
With regard to iodine, which is hypertonic?
With regard to starch, which is hypertonic?
4 points
4
Question 9
9.
Make Predictions about which substance will move:
Into Beaker
Into Tube
If the tube is permeable to starch, which way would the starch move?
If the tube is permeable to iodine, which way would the iodine move?
4 points
4
Question 10
10.
Make Predictions about which substance will move:
Orange
Purple
No Change
If the tube is permeable to iodine, what color would you expect the contents to change?
If the tube is permeable to iodine.. what about the solution in the beaker?
If the tube is permeable to starch, what color would you expect it to change?
If the tube is permeable to starch, what about the solution in the beaker?
2 points
2
Question 11
11.
What is observed when a dialysis tube filled with a starch solution is placed in a beaker with an iodine solution? Select all that apply.
2 points
2
Question 12
12.
Image taken after five minutes
Clear/white
yellow
dark purple
Solution in Beaker before 5 minutes
Solution in Tube before 5 minutes
2 points
2
Question 13
13.
Image taken after five minutes
Clear/white
yellow
dark purple
Solution in Beaker after five minutes.
Solution in Tube after five minutes.
1 point
1
Question 14
14.
Based on your observations, which substance moved, the iodine or the starch?
1 point
1
Question 15
15.
The dialysis tube was permeable to which substance?
9 points
9
Question 16
16.
Lab Summary - Explain how this experiment models a cell membrane. Use the following terms in your explanation: selectively permeable, hypertonic, diffusion, indicator. Review rubric prior to responding.