This document describes an experiment involving a Visking tube filled with a glucose solution and placed in a beaker of iodine solution. Over time, the iodine traveled up the Visking tube, showing that iodine molecules are smaller than starch molecules. It also explains the importance of starch breaking down into glucose during digestion so nutrients can be absorbed.

2. Solution
in
Contents
Iodine test
Benedict’s
testInitial
colour
Final
colour
Visking
tube
Glocose
solution
+
starch
suspension
Beaker
Distilled water
+
iodine
solution

3. 1. Based on the results, make an inference on
the size of the iodine molecules as
compared to starch molecule.
2. Compare the size of glucose molecules with
the starch molecule.
3. Based on the results of this experiment,
explain briefly the importance of breakdown
of starch to glucose in the digestive canals.

5. Time interval
(min)
Level of sucrose solution in the capillary
tube (cm)
0
10
20
30
40

7. 1. Describe the graph that you have plotted
2. What cause the change in the levels of the
sucrose solution?
3. What inferences can you make to regarding the
size of the sucrose and water molecules, and
the size of the pore on the Visking tube?
4. Predict the outcome of the results if the
experiment is repeated by filling the Visking
tube with the distilled water and the beaker with
30% sucrose solution.