1. Control Variables
Which control variables did you choose for these experiments?
Reply to your classmates and discuss whether some of these are
things that would be “coincidentally the same” versus ones that
“you take deliberate action to keep the same.”
2. Surprise Starches
How did your “Starchy” foods respond compared to your
hypotheses? Do you believe the results or do you think the test may
not have properly detected the appropriate chemicals? Reply to
classmates and share similar results, suggest alternative means of
identification, or identify likely sources of error.
3. Surprise Emulsifiers
Let me confess that we were SHOCKED when we first did this
experiment on American cheese and no oil floated to the top.
Emulsifiers, right! Research the nutritional components of one of
your “fatty” foods to see which item is the emulsifier. Reply to
classmates with similar results or suggest alternate emulsifiers.
Do you still want to eat the food now that you’ve done this test?
Why or why not?
You must participate in at least one of the discussions. Make
sure you post at least once by the first post date (check the
schedule), that some of your posts are replies to other classmates,
and that you post at least three times.
Experiment is attached 
Chemical Composition of Cells: Experiment Instructions (Lab Report) LEARNING GOALS By the end of this unit, you should be able to do the following: 1. Describe the difference between organic and inorganic chemicals. 2. Relate oxygen content of a chemical to whether it is hydrophilic or hydrophobic 3. Explain the relationship between starch, fiber, and complex carbohydrates and how they relate to glucose, sugar, and simple sugars 4. Describe how to use iodine, Benedict, and Biuret ests to identify starch. simple sugars, and protein respectively 5. Describe the color of a positive reaction and a negative reaction for iodine, Benedict, and Biuret tests. 6. Describe how an emulsifier changes the mixing of oil and water, 7. Identify the Independent, Dependent, and Control Variables in your experiment. MATERIALS NEEDED l bottle of iodine (Get “Iodine Tincture” or Betadine antiseptic in the pharmacy section. DO NOT use decolorized iodine.) 1 bottle of blue or green food coloring l small potato 1 small onion 1 leaf of lettuce 1 stick of butter 1 egg yolk
ScholarMatic: Explanation & Answer
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