AnswersHVA 26-27 IM Biology ALab: Diffusion Across a Semi-permeable Membrane

Lab: Diffusion Across a Semi-permeable Membrane Answers

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1
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Did you read the Student Guide carefully?

A
yes
B
no
2
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✔ CX Vmaterial used as the membrane

A
C
B
V
3

✔ CVamount of substances used

A
C
B
V
4

✔ CVnumber of trials

A
C
B
V
5

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

A
C
B
V
6

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

A
independent
B
dependent
7

material to diffuse is the independent✔ dependent variable.

A
independent
B
dependent
8

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.X C✔ Vmolecule size (large starch molecules vs. small glucose molecules)

A
C
B
V
9

Select all steps below that help you handle chemicals safely.

A
using droppers to transfer small amounts of chemicals
B
using tongs to move hot objects
C
checking the test tubes for chips prior to using them
D
washing your hands after you finish the lab
10

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

A
Chips or cracks will make your experiment take longer.
B
You could cut yourself on glassware that has a chip.
C
Chips or cracks can make the glassware more likely to break during use.
D
Chips or cracks will change the outcome of the experiment.
11

Did you read the Student Guide carefully?

A
yes
B
no
12

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)

A
C
B
V
13

Question text not available

Answers:
, and the dependent variable:molecule size
.:ability to diffuse
14

material used as the membrane

A
C
B
V
15

Select all steps below that help you handle chemicals safely.

A
using droppers to transfer small amounts of chemicals
B
using tongs to move hot objects
C
checking the test tubes for chips prior to using them
D
washing your hands after you finish the lab
16

✔ yesX no

A
✔ yes
B
X no
17

Did starch diffuse through the membrane? yes✔ nounknown

A
yes
B
✔ no
C
unknown
18

Did you record all the data throughout the virtual lab?

A
yes
B
no
19

The independent variable in this experiment was ✔ molecule sizemolecule colormolecule speed, and the dependent variable

Answers:
, and the dependent variable:molecule size
.:ability to diffuse
20

amount of substances used

A
C
B
V

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Lab: Diffusion Across a Semi-permeable Membrane