A group of students from Awasi Boys High School set up an experiment to demonstrate a certain process. The experimental set up were as shown in the diagrams below.

A group of students from Awasi Boys High School set up an experiment to demonstrate a certain process. The experimental set up were as shown in the diagrams below.

Snap 2023 03 14 at 18.50.14

After 10 minutes the students recorded their observation in a table as shown below.

Snap 2023 03 14 at 18.52.15

a) Name the process being demonstrated by this experiment. (1mk)

Diffusion
b) Explain the result in the experiment set up I. (3mks)

  • Visking tubing is semi-permeable
  • Iodine molecules Move from beaker into the visking tubing
  • Thus producing the blue-black colour with starch solution
  • Starch molecules are too large to pass through the walls of the visking tubing into solution in the beaker
  • therefore Iodine solution doesn’t change colour
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