Iodine and Starch Experiment Analysis

Mr. Kobe conducts a dialysis lab experiment for students who missed the class. He explains the properties of dialysis tubing, prepares a solution with starch and glucose, and immerses it in iodine water. The experiment aims to observe diffusion of iodine, glucose, and starch through the dialysis membrane. Demonstrations show color changes when iodine reacts with starch and glucose testing strips indicate glucose presence. Final observations reveal a color change inside the dialysis bag, no change in the iodine solution, and glucose detection in the surrounding water.

What material is the dialysis tubing made from?

• Glass

• Seaweed

• Plastic

• Rubber

How much starch and glucose are added to the dialysis membrane?

• 10 ml of starch and 10 ml of glucose

• 5 ml of starch and 5 ml of glucose

• 10 ml of starch and 5 ml of glucose

• 5 ml of starch and 10 ml of glucose

What is the purpose of adding iodine to the water in the experiment?

• To increase the temperature of the solution

• To test if iodine can diffuse into the dialysis bag

• To change the color of the water

• To dissolve the starch

What color change indicates the presence of starch when iodine is added?

• Green

• Red

• Blackish purplish bluish

• Yellow

What does a green color on the glucose testing strip indicate?

• No glucose present

• Medium concentration of glucose

• High concentration of glucose

• Low concentration of glucose

What observation was made about the color inside the dialysis bag after the experiment?

• It became orange

• It turned green

• It turned a darkish purplish color

• It remained milky white

What was the color of the iodine solution in the cup after the experiment?

• It turned black

• It remained orange bronze

• It became clear

• It turned blue

What does the change in color of the glucose testing strip in the iodine water indicate?

• Presence of glucose

• Presence of salt

• Presence of starch

• Presence of iodine

What conclusion can be drawn if the glucose testing strip turns green?

• A large amount of glucose diffused out of the bag

• A small amount of glucose diffused out of the bag

• No glucose diffused out of the bag

• The glucose testing strip is faulty

What is the significance of the purple color inside the dialysis bag?

• It indicates the presence of glucose

• It indicates the presence of iodine

• It indicates the reaction between starch and iodine

• It indicates the presence of salt