Lab: Diffusion Across a Semi-permeable Membrane

Question 1

The independent variable in this experiment was , and the dependent variablewas .

Revolt · Accepted Answer

A: molecule size

Question 2

The tubing contains . The beakercontains .

Revolt · Accepted Answer

A: starch solution

Question 3

Initially, glucose was found only ✔ insideoutsideboth inside and outsideneither inside nor outside the dialysis tubing. After 15 minutes, a sample was taken. That sample showed that glucose was found

Revolt · Accepted Answer

A: inside

Question 4

Analysis: diffused though the semipermeable membrane.

Revolt · Accepted Answer

D: Only glucose (smaller molecules)

Question 5

Starch molecules are too large to pass through the tubing into the beaker. Which errors could have caused starch to appear in the beaker despite this fact? Check all possible errors.

Revolt · Accepted Answer

A: not washing the outside of the tubing after filling it with starch; B: reusing droppers for different solutions; D: using a beaker that had not been cleaned thoroughly

Question 6

Based on what you learned in the lab, why does your body need to break down starch into glucose?

Revolt · Accepted Answer

B: Starch molecules are too large to diffuse into cells.

Question 7

was .

Revolt · Accepted Answer

B: ability to diffuse

Question 8

contains .

Revolt · Accepted Answer

B: Lugol’s solution

Question 9

inside✔ outsideboth inside and outsideneither inside nor outside the dialysis tubing.

Revolt · Accepted Answer

B: outside

Question 10

Conclusion: Starch has a larger molecule size than glucose. So you can conclude that larger molecules are likely than smaller molecules to diffuse across a semipermeable membrane.

Revolt · Accepted Answer

A: less

Lab: Diffusion Across a Semi-permeable Membrane Answers

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