Benedict's or Tollens' Reagents: Reducing Sugars

Question	Answer
Benedict's reagent an ______ solution containing a _____ _____ complex ion.	Benedict's reagent an alkaline solution containing a cupric citrate complex ion.
Tollens' solution _________ oxidize giving a positive test with _____ and _____.	Tollens' solution [Ag+(NH3)2OH-] oxidize giving a positive test with aldoses and ketoses.
The tests are ________ even though aldoses and ketoses exist primarily as _____ ________.	The test are positive even though aldoses and ketoses exist primarily as cyclic hemiacetals.
Benedict's solution is the color ______ from the _____. Once it oxidizes an aldose or ketose it becomes a ______ color of the precipitate ______.	Benedict's solution is the color blue from the Cu+2. Once it oxidizes an aldose or ketose it becomes a brick-red color of the precipitate CU2O.
In alkaline solution ketoses are converted to _______ which are then oxidized by the ________ complexes.	In alkaline solution ketoses are converted to aldoses which are then oxidized by the cupric complexes.
Sugars that give a positive test with ________ or ________ solutions are known as ________.	Sugars that give a positive test with Tollens' or Benedict's solutions are known as reducing sugars.
All __________ that contain a ________ ______ give positive test.	All carbohydrates that contain a hemiacetal group give positive test.

Resource summary

	Created by Danielle Thibeadeaux over 10 years ago