1. Contents Iodine test Benedict’s test
Visking tubing 10ml glucose solution +
10ml starch suspension
Solution turns blue-black Brick-red precipitate is formed
Beaker 400ml distilled water Solution remains yellow Brick-red precipitate is formed
2. 1. Both glucose and starch molecules are found in Visking tubing whereas
only ………………. molecules are found in the beaker.
2. It indicates that the size of the starch molecules is ………. than the size of
……….. molecules.
• Iodine test:
• The content of the Visking tubing turns ………… (indicating the presence of ……….). The colour of
the solution in the beaker remains yellow, indicating that the starch molecules are too ……… to
diffuse through the pores on the membrane of the Visking tubing.
• Benedict’s test:
• Both solution in the Visking tubing and beaker turns into …………………………. (indicating the
presence of ………………)
• Glucose molecules are ………….. enough to pass through the pores on the Visking tubing.
3. 3. They are both ……………………………. Both of them only allow ………….
molecules to pass through its membrane.