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26 27 Food Test Experiment: Hypothesis (for unknown Sample): Conclusion: Known Samples Food Sample Observat ions (picture and words) Grease Stain? Iodide.

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Presentation on theme: "26 27 Food Test Experiment: Hypothesis (for unknown Sample): Conclusion: Known Samples Food Sample Observat ions (picture and words) Grease Stain? Iodide."— Presentation transcript:

1 26 27 Food Test Experiment: Hypothesis (for unknown Sample): Conclusion: Known Samples Food Sample Observat ions (picture and words) Grease Stain? Iodide Color Change ? Nitric Acid Color Change ? UnknownSample X

2 Procedures: Testing for Lipids 1.Place a small piece of 3 samples on top of a paper napkin. Leave it there for a minute. 2.Make an observation for each sample and write it on your chart (a picture and some words) 3.Move the food samples at least 2 inches above or below where you initially placed the sample. 4.If there is a grease stain on the napkin, we can assume the food sample(s) contains the following macromolecule: Lipids! Record on your chart (Yes or No)

3 Procedures: Testing for Carbohydrates 4. Place another small piece of all 3 samples on a paper napkin. 5.Place 3 drops of iodide on your food samples. If the iodide changes color, then you can assume that the food sample(s) contains the following macromolecule: Carbohydrates! 6.Record on your chart whether or not your sample changed color

4 Procedures: Testing for Proteins 6. Place yet another small sample of the same 3 food sample. Your co-teacher will place a drop of nitric acid on your food samples. 7.If the drops of nitric acid changes color, then you can assume that your sample(s) contain the following macromolecule: Proteins. 8.Record whether or not your sample changed color.

5 Left Side  Hypothesis: Form a hypothesis about your unknown. What kind of macromolecules do you think the unknown contains? Do you think there will be a grease stain or/and color change?

6 What is a conclusion? The final step in the scientific method. a summary of the experiment's results Based on your results was your hypothesis Rejected or supported? Why?


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