Diffusion Through A Membrane

Question 1

Dialysis

Answer 1

Tube (selective barrier/size)

Question 2

Starch

Answer 2

Large molecule

Question 3

Glucose

Answer 3

Small molecule

Question 4

Iodine

Answer 4

Indicator for starch, small, can diffuse easily

Question 5

Benedict Solution

Answer 5

Indicator for glucose + heat, large, can’t diffuse solution

Question 6

Step 1

Answer 6

Add glucose + 5 drops of starch into a dialysis tube, then tie both ends closed

Question 7

Step 2

Answer 7

Place dialysis tube into beaker and fill with water

Question 8

Step 3

Answer 8

Add 10 drops of iodine into beaker and 10 drops of Benedict into beaker

Question 9

Iodine + starch

Answer 9

Blackish purple color

Question 10

Benedict + glucose w/ heat

Answer 10

Orange color change