Lab: Diffusion Across a Semi-permeable Membrane

Question 1

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.molecule size (large starch molecules vs. small glucose molecules)

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V

Question 2

material used as the membrane

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C

Question 3

amount of substances used

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C

Question 4

number of trials

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C

Question 5

whether the molecules diffused through the membrane (tubing)

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V

Question 6

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

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independent

Question 7

Select all steps below that help you handle chemicals safely.

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using droppers to transfer small amounts of chemicals; using tongs to move hot objects; checking the test tubes for chips prior to using them; washing your hands after you finish the lab

Question 8

material to diffuse is the variable.

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dependent

Question 9

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

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You could cut yourself on glassware that has a chip.; Chips or cracks can make the glassware more likely to break during use.

Lab: Diffusion Across a Semi-permeable Membrane Answers

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