Chapter14: Formula Method
Section: Chapter Questions
Problem 40SST
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Question
14. List the following in order of decreasing size : performances in the sac, starch molecules, glucose molecules.
Transcribed Image Text:Methyar weight 374)
Difuslon and Moleeul
Record the diameter of the colored circle
mm
weight 15e)
9.
What relationship exists between molecular weight and the rate of diffusion?
Diffuslon and Molecular Size
10.
Coserve all color changes in the practice test. Record your observations in the space below
Starch Test
Tube 1- Starch + la Kl:
Tube 2 - Tap water + Ia KI
Glucose Test
Tube 1- 1% glucose + Benedict's (heated):
Tube 2 - 0.1% glucose + Benedict's (heated):
Tube 3- Tap water + Benedict's (heated):
On the basis of the indicator test for starch, what must have happened to the lodine molecules that
were originally only in the water in the large test tube?
11.
On the basis of the indicator test for glucose, what must have happened to the glucose molecules
that were originally in the cellulose tubing sac?
12.
13.
How do you know?
Did starch molecules diffuse out of the sac?
List the following in order of decreasing size: perforations in the sac, starch molecules, glucose
molecules.
(largest)
(smallest)
Diffusion and Temperature
15.
Record your measurements of the colored areas in the space below.
At room temperature:
At freezing:
16. What evidence do you have that diffusion occurs more rapidly under warmer conditions?
17.
Muscle contractions which move the body depend heavily on diffusion. Why do we have
moving our fingers, etc. when they are cold?
xercise 6, 5/13
6-7
Osmos
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