If the mystery food sample contained the nutrient, then it would change to the same color as the
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Sample Response: The mystery food sample did not test positive for protein using the Biuret indicator, so the sample can not be tofu, which is what Zack ate.
To determine if the substance in the first test tube above is indeed a meat, you could also test it using
In this lab, the only test that turned out positive was for
Based on the data you collected, who likely left the the classroom mess? Justify your answer.
Sample Response: The mystery food sample did test positive for Sudan red. Nicole ate salad dressing, which contains fat, a lipid. She is the likely culprit. Check all facts below that you included in your explanation.The mystery food sample tested positive for lipids using the Sudan red indicator.Nicole ate salad dressing.Salad dressing contains fat, a lipid.Nicole is probably guilty.
What is the name of the glass container above that you used to heat water?test tubea volumetric flaskan Erlenmeyer flaska beaker
The data above indicate an error. How do you know? What might have caused the error?
Water is a negative control and should not test positive for protein, meaning it should have remained blue (the color of the Biuret reagent) rather than turning pink or purple. This error indicates that the sample was likely contaminated with protein or that the test tube was mislabeled.
If the mystery food sample contained the nutrient, then it would change to the same color as the indicator.✔ positive control.negative control.
In this lab, the only test that turned out positive was for proteins.lipids.polysaccharides.X monosaccharides.
Based on the data, was Zack, who ate the tofu, guilty of leaving a mess in the classroom? yes✔ no
Based on the data you collected, who likely left the the classroom mess? Zack✔ NicoleChristianAbigail
What is the name of the glass container above that you used to heat water?
To determine if the substance in the first test tube above is indeed a meat, you could also test it using ✔ Biuret solution.Lugol's solution.Benedict's solution.Sudan red.
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Justify your answer.
The mystery food sample did test positive for Sudan red. Nicole ate salad dressing, which contains fat, a lipid. She is the likely culprit.
Why was a beaker used for heating the solution? The beaker is the only one that can withstand high temperatures.The beaker's wide mouth makes it easier to add and remove test tubes without spillingA beaker fits the whole surface of the hot plate.The beaker can be more accurately read than a volumetric flask.
Which possible errors did you include in your response? Check all that apply.The water should not be pink/purple because water should test negative for protein.The water should actually have turned blue, because Biuret solution is blue.Someone may have mislabeled the test tube with waterThe water may have been contaminated with a protein.
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