Lab: Diffusion Across a Semi-permeable Membrane

Question 1

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

Revolt · Accepted Answer

molecule size; Selection 1: molecule size; Selection 2: ability to diffuse

Question 2

was .

Revolt · Accepted Answer

ability to diffuse

Question 3

The tubing contains . The beakercontains .

Revolt · Accepted Answer

starch solution and Lugol’s solution; Selection 1: starch solution and Lugol’s solution; Selection 2: only Lugol’s solution

Question 4

contains .

Revolt · Accepted Answer

only Lugol’s solution

Question 5

The tubing contains . The beakercontains .

Revolt · Accepted Answer

starch solution; Selection 1: starch solution; Selection 2: Lugol’s solution

Question 6

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

inside; Selection 1: inside; Selection 2: outside

Question 7

Analysis: diffused though the semipermeable membrane.

Revolt · Accepted Answer

Only glucose (smaller molecules)

Question 8

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

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

Question 9

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

Revolt · Accepted Answer

Starch molecules are too large to diffuse into cells.

Question 10

contains .

Revolt · Accepted Answer

Lugol’s solution

Lab: Diffusion Across a Semi-permeable Membrane Answers

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