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
Nookie1986 [14]
3 years ago
9

Biuret reagent will indicate the presence of

Chemistry
1 answer:
weeeeeb [17]3 years ago
5 0
Biuret reagent will indicate the presence of protein in a given sample. It is also known as the Piotrowski's test. This reagent consists of copper (II) sulfate and sodium hydroxide. It detects peptide bonds by the reaction of the copper ions in an alkaline solution. The copper ions would form violet colored complexes when peptide is present in the solution. From this test, concentration can be calculated since the intensity of the color depends on the amount of peptide bonds and according to the Beer-Lambert law concentration and the absorption of light is proportional. The concentration is calculated by a spectrophotometric technique at a wavelength of 540 nm. 
You might be interested in
The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the
NikAS [45]

Answer: 0.225 atm

Explanation:

For this problem, we have to use Boyle's Law.

Boyle's Law: P₁V₁=P₂V₂

Since we are asked to find P₂, let's manipulate the equation.

P₂=(P₁V₁)/V₂

P_{2} =\frac{(1.00atm)(0.45L)}{2.00L}

With this equation, the liters cancel out and we will be left with atm.

P₂=0.225 atm

6 0
3 years ago
The complete combustion of propane (C3H8) in the presence of oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) 3CO2 (g) + 4H2O (g) a
mixas84 [53]

Answer:

26.9 L is the volume of CO₂, we obtained

Explanation:

The reaction is: C₃H₈(g) + 5O₂(g)  →  3CO₂ (g) + 4H₂O (g)

Let's determine the reactants moles:

27.5 g . 1mol / 44 g = 0.625 moles

We need density of O₂ to determine mass and then, the moles.

O₂ density = O₂ mass / O₂ volume

O₂ density . O₂ volume = O₂ mass

1.429 g/L . 45L = O₂ mass → 64.3 g

Moles of O₂ → 64.3 g . 1mol/32g = 2.009 moles

Let's find out the limiting reactant:

1 mol of propane needs 5 moles of oxygen to react

Then, 0.625 moles will react with (0.625 . 5)/1 = 3.125 moles of O₂

Oxygen is the limiting reactant, we need 3.125 moles but we only have 2.009 moles

Ratio is 5:3. 5 moles of O₂ produce 3 moles of CO₂

Therefore, 2.009 moles of O₂ must produce (2.009 .3) /5 = 1.21 moles of CO₂. Let's find out the volume, by Ideal Gases Law (STP are 1 atm and 273K, the standard conditions)

1 atm . V = 1.21 moles . 0.082 . 273K

V = (1.21 moles . 0.082 . 273K) / 1atm = 26.9 L

3 0
3 years ago
PLEASE HELP THIS IS DUE TODAY
stepan [7]

Answer:

94.99%

Explanation:

4 0
3 years ago
Which is most likely why many scientists reject the cold fusion theory?
mina [271]
The original results have not been replicated consistently and reliably.

8 0
3 years ago
Read 2 more answers
Scientific explanations are not always based on empirical evidence <br><br> True or false?
tigry1 [53]
True some explanations are not always based on empirical evidence
4 0
3 years ago
Other questions:
  • Gas particles are pumped into a rigid steel container at a constant temperature. Which statement describes the change in pressur
    15·1 answer
  • ______________ is the process of translating a message received into understandable language or symbols.
    12·1 answer
  • Salt water can be desalinated by distillation. How much energy is needed to convert 175 g of salt water at 28.0 °C to water vapo
    9·1 answer
  • Diamond, graphite, and fullerenes share what property? A. They are all made of carbon (C) bonded to a metal. B. Their shape. C.
    9·1 answer
  • Which measurement describes the pressure of a gas?
    13·1 answer
  • 16. What mass of sulfur has to burn to produce 4.5L SO2 at 300°C and 101 kPa in the following reaction? A. 41.0 g S B. 3.07 g S
    14·1 answer
  • Pablo wants to enter the science fair. Which question could be answered through scientific investigation?
    7·2 answers
  • Drag the tiles to the correct boxes to complete the pairs.
    11·1 answer
  • 1)Water takes this form above 100c (solid, liquid or gas)
    15·1 answer
  • Explain with equations and calculations, when necessary, whether an aqueous solution of each of these salts is acidic, basic, or
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!