

Understanding Barfoed's Test
Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Practice Problem
•
Hard
Jennifer Brown
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of Barfoed's test?
To measure the pH level of a solution
To distinguish reducing monosaccharides from reducing disaccharides
To detect the presence of proteins
To identify non-reducing sugars
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a characteristic of monosaccharides?
They are always disaccharides
They are non-reducing sugars
They contain a free aldehyde or ketone group
They are complex carbohydrates
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main difference between reducing and non-reducing disaccharides?
Non-reducing disaccharides are stronger reducing agents
Non-reducing disaccharides contain a free aldehyde group
Reducing disaccharides have a free hemiacetal group
Reducing disaccharides do not react with Barfoed's reagent
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the composition of Barfoed's reagent?
1 molar hydrochloric acid
0.33 molar copper acetate in a dilute aqueous solution of acetic acid
0.33 molar copper sulfate in ethanol
0.5 molar sodium hydroxide in water
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do monosaccharides react with Barfoed's reagent?
They do not react at all
They react slowly over several hours
They react quickly, forming a brick red precipitate
They change the color of the solution to blue
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the expected result when a reducing disaccharide is tested with Barfoed's reagent?
No reaction occurs
Immediate formation of a blue precipitate
The solution turns green
Formation of a brick red precipitate after about 10 minutes
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following sugars would react fastest with Barfoed's reagent?
Maltose
Lactose
Glucose
Sucrose
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