Chemistry, 11.04.2020 01:32 elricardo34

Amy is asked to determine the chemical composition of an unknown liquid sample. She determines that the sample is negative for protein, simple sugars, and lipids. However, someone else has used up all of the iodine reagent. Which scenario would allow Amy to test the unknown sample for the presence of starch

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Answer from: 30352

Amy can apply the Tyndall Beam effect ,by shining a beam of light through the sample solution.

Explanation:

The chemical test for starch is add iodine solution to the tested sample which is yellow/brown and observe the color change to blue/black color. However, the physical test to distinguish simple sugars from starch is the shine a beam of light through the sample solution. Because that sample solution contained no simple sugars, then the presence of starch in the solution will be indicated by dispersal of light because the large starch molecules are enough to affect the light.

Answer from: mfweldon64

In order to test the unknown sample for the presence of starch, Amy should B. Incubate the unknown sample with amylase and then test for simple sugars.

Amylase is an enzyme that breaks starch down to sugars so if Amy incubates the substance with amylase and the substance has starch, the starch will be broken down to sugars which can then be tested for.

If there was starch, a sugar test would be positive.

Other options are wrong because:

the test is for starch so any test for proteins is wrong the Benedict's test is for sugars not starch to use potatoes to test for starch, an iodine solution is needed

In conclusion therefore, the best way to test for starch would be to incubate with amylase and then test for simple sugars.

For more information, look at link.

Options for this question include:

A. Incubate the unknown sample with pepsin and then test for proteins.

B. Incubate the unknown sample with amylase and then test for simple sugars.

C. Add a known amount of starch to the unknown sample and then run the Benedict's test.

D. Incubate the unknown sample with catalase and then test for proteins.

E. Put a small amount of the unknown sample onto a fresh potato slice and observe for color changes.

Answer from: Quest

passing a magnet thought the

mixture , because iron gets attracted to magnet .

Answer from: Quest

the food using pesticides in the future will harm you by giving you diseases like cancer or something since they have things that we should not eat in it like chemicals or pesticides. that is why organic food is more expensive because they take the time to make it right and healthy for you to eat.

explanation:

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