Why do Benedict's, iodine, and Biuret tests change color?

[tata105]

3 quick questions...PLEASE HELP!

I have 3 questions regarding: Benedicts Test, Iodine Test, and Biuret Test.

I need to know: Why they work, What they test for, and Why the change color.

Any help would be greatly apprectiated.

 

[Astronuc]

I have 3 questions regarding: Benedicts Test, Iodine Test, and Biuret Test.

I need to know: Why they work, What they test for, and Why the change color.

Any help would be greatly appreciated.

Try searching for "Benedict's solution" or Benedict's reagent", and similarly, "Biuret reagent" or "Biuret test".

I would expect a chemistry textbook would have some discussion.

Students are expected to show some effort.