please help asap :) 1) what does a postive reaction to benedicts solution indica

Question

please help asap :)

1) what does a postive reaction to benedicts solution indicate about the solution you are testing? what change do you expect to see if a solution has a positive reaction to the benedicts solution?

2)what do you expect to see in a postive reaction to biuret solution? what kind of molecule is present if there is a postive reaction? specifically, what part of the molecular structure reacts with the biuret solution?

3)    using the brown paper test, how would you tell if a solution contains lipid?

4) differentiate between a positive and negative sudan iv test is positive ?

5) which of the following materials would you expect to give a postive result when tested with lugols iodine? expain why

a. potato

b.glucose

c.starch

d. egg albumin

Explanation / Answer

1) NOn reducing sugars, dark brown color is observed on heating

2) proteins are identified by this test especially peptide bond.In the presence of peptides, a copper(II) ion forms violet-colored coordination complexes in an alkaline solution.

3) lipids leave translucent spots (grease spots) on unglazed brown paper bags

4) Sudan red is a fat-soluble dye that stains lipids red , where as negative color less.

5)starch,Lugol's reagent (iodine solution) changes from yellowish-brown to dark purple/black.

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