Lab: Diffusion Across a Semi-permeable Membrane Answers

Did you read the Student Guide carefully?

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Think about the lab procedure you just read. Label each factor below V if it was variable during the procedure or C if it was constant.C✔ Vmolecule size (large starch molecules vs. small glucose molecules)

✔ CVmaterial used as the membrane

✔ CVamount of substances used

✔ CVnumber of trials

C✔ Vwhether the molecules diffused through the membrane (tubing)

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Now label the variables: Molecule size is the ✔ independentdependent variable. The ability of the

material to diffuse is the independent✔ dependent variable.

Select all steps below that help you handle chemicals safely.

Select all the reasons for checking glassware for cracks or chips prior to use.

✔ yesX no