1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kitty [74]
4 years ago
12

What are 2 half reactions for the reaction of glucose with Benedict’s reagent?

Chemistry
1 answer:
zloy xaker [14]4 years ago
4 0
Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent named after American chemist Stanley Rossiter Benedict.[1]

Benedict's test

Positive Benedict's test

ClassificationColorimetric methodAnalytesReducing sugars

It is a complex mixture of sodium carbonate, sodium citrate and copper(II) sulphate pentahydrate.[2] It is often used in place of Fehling's solution to detect the presence of reducing sugars. The presence of other reducing substances also gives a positive reaction.[3] Such tests that use this reagent are called the Benedict's tests. A positive test with Benedict's reagent is shown by a color change from clear blue to a brick-red precipitate.

Generally, Benedict's test detects the presence of aldehydes and alpha-hydroxy-ketones, also by hemiacetal, including those that occur in certain ketoses. Thus, although the ketose fructose is not strictly a reducing sugar, it is an alpha-hydroxy-ketone, and gives a positive test because it is converted to the aldoses glucose and mannose by the base in the reagent.

The principle of Benedict's test is that when reducing sugars are heated in the presence of an alkali they are converted to powerful reducing species known as enediols. Enediols reduce the cupric compounds (Cu2+) present in the Benedict's reagent to cuprous compounds (Cu+) which are precipitated as insoluble red copper(I) oxide(Cu2O).

The color of the obtained precipitate gives an idea about the quantity of sugar present in the solution, hence the test is semi-quantitative. A greenish precipitate indicates about 0.5 g% concentration; yellow precipitate indicates 1 g% concentration; orange indicates 1.5 g% and red indicates 2 g% or higher concentration.


You might be interested in
Balanced chemical equations a) Sodium + Oxygen
mario62 [17]

Answer:

a) sodium oxide

b) potassium peroxide

c) Hydrogen chloride

d) form ammonia

e) Calcium nitride

3 0
3 years ago
A silver necklace is made from a pure sample of silver that is free of impurities.
jonny [76]
Componys and rocks hope that helped

3 0
3 years ago
I need help I don’t really get what I have to do to get the answer
ladessa [460]
Reactants are what you start with. Products are what come into being by or through the reactants. You can figure out what the products are in these sentences (which are really chemical equations written out in words rather than symbols) by looking for terms like “yield(s)/to yield,” “form(s)/to form,” “produce(s)/to produce,” “give(s)/to give,” etc. All of these terms provide the notion that you’re getting or making something. The specific substance(s) that follow these terms would be your product(s); the substance(s) that precede these terms would be your reactant(s).

So, for question 2, we see the term “produces.” There is one substance that precedes that term—potassium chlorate, which would be our sole reactant. And there are two substances that follow that term—potassium chloride and oxygen gas, which would be our two products.

In question 3, we see the term “yields” preceded by ammonium nitrate—our sole reactant—and followed by nitrogen gas, oxygen gas, and water vapor—our three products.

Lastly, in question 4, we see the explicit term “produces.” Moreover, we are told directly that dinitrogen tetrahydride reacts with oxygen gas; it should be pretty clear that these two substances are our two reactants here. The substances that we are told are produced are nitrogen gas and water, which would be our two products.
7 0
3 years ago
What will happen to the temperature<br> when KCI is added to water?
Anna35 [415]

Answer:

As potassium chloride (KCl) dissolves in water, the ions are hydrated. ... Ion-dipole forces attract the positive (hydrogen) end of the polar water molecules to the negative chloride ions at the surface of the solid, and they attract the negative (oxygen) ends to the positive potassium ions.

7 0
3 years ago
Coca cola is similar to tomato juice because
Nataliya [291]
<span>Coca-cola is similar to tomato juice because both are acidic drinks. Coca-cola is acidic because it is a carbonated drink. This means there is a presence of an acid in coke namely: carbonic acid and phosphoric acid. Tomato juice is also acidic because of the presence of vitamin c (ascorbic acid), but slightly less acidic than coke.</span>
4 0
4 years ago
Read 2 more answers
Other questions:
  • What adaptations of the harpy eagle allow it to be such a successful rainforest predator?
    10·1 answer
  • Why does the black carbon ball have 4 holes while the white hydrogen ball only has one hole?
    6·1 answer
  • The specific heat of gold is 0.031 calories/gram°C. If 10.0 grams of gold were heated and the temperature of the sample
    5·1 answer
  • I'll mark you brainliest if you answer first! - Iron filings and copper (II) sulphate solution are mixed together and they produ
    11·1 answer
  • A gas that has a volume of 28 liters, a temperature of 45 0 C, and an unknown pressure has its volume increased to 34 liters and
    7·1 answer
  • How many joules are needed to heat 20.0 g of Au from 10°C to 50°C?<br> show work
    5·1 answer
  • Which plant part makes most of the food?<br><br> A. Roots<br> B. Fruit<br> C. Flower<br> D. Leaf
    11·1 answer
  • Which of the following would make a solution
    12·2 answers
  • Helooooooopoooooo<br> kk
    11·1 answer
  • when holden goes to visit phoebe, how does she react to his arrival? how are the two similar and how are they different?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!