semis (lab)

Question 1

are sugars that donates electrons to other substances and characterized by a free aldehyde or ketone group in a sugar molecule

Answer 1

Reducing sugars

Question 2

are does not have a free aldehyde or ketone group and therefore cannot donate electrons in a redox reaction.

Answer 2

Non-reducing sugars

Question 3

5 tests

Answer 3

Molisch’s
Benedict’s
Nylander’s
Barfoed’s
Seliwanoff’s

Question 4

is a chemical test which distinguishes between aldose and ketose sugars.

Answer 4

Seliwanoff’s test

Question 5

a chemical test used to detect the presence of carbohydrates in a given analyte.

Answer 5

Molisch’s test

Question 6

presence of purple ring at the juncture of two solutions (alpha-naphthol solution and sulfuric acid)

Answer 6

Molisch’s test

Question 7

Brick red color of the sample after reaction

Answer 7

Benedict’s test

Question 8

presence of black precipitate

Answer 8

Nylander’s test

Question 9

Reddish precipitate

Answer 9

Barfoed’s test

Question 10

This chemical test is used to distinguish ketose from an aldose sugar.

Answer 10

Seliwanoff’s test

Question 11

cherry – red colored complex

Answer 11

Seliwanoff’s test