Answer:
The answer is c substitution
Answer:
Biuret reagent is the correct answer.
Explanation:
Biuret reagent is used to test the presence of the protein in a solution.
The biuret solution contains
Biuret reagent is a solution that is blue in color and when it reacts with protein the color gets a change to pink-purple due presence of several peptide bonds and when there is no protein present in the solution the color remains blue.
The biuret reaction takes place when the copper II ions placed in the solution as a cupric sulfate gets reduce to copper I ions due to the presence of peptide bonds and the color change is observed from blue to violet.
The biuret reagent is used to test for proteins. A biuret test, also known as a peptide bond test, is a chemical test used to measure the number of peptide bonds present in an analyte.
Biuret reagent consists of NaOH (sodium hydroxide) and hydrochlorofluorocarbons (sulfate) and potassium sodium tartrate. The tartrate is added to the chelate to stabilize the cupric ions.
When pure, the reagent is a pale blue color. However, when the reagent is mixed with protein, the reaction results in a light purple color. The deep blue/purple color is caused by a copper ion complex with a protein amide group.
To learn more about the biuret reagent, refer to the link:
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A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device?
A. 13.32 A
B. 3.33 A
C. 8 A
D. 10 A
Answer is 3.33 A
Ok so in this experiment what we want to find is the catalyst for the reaction. Our original reaction is the following. A + B --> C, therefore to find which of the unknown substances (X, Y, and Z) is the catalyst reaction we simply have to do the following:
A + B + X --> C
A + B + Y --> C
A + B + Z --> C
The reaction that produces C much faster than our original reaction A + B --> C will be our catalyst. The reason being that one of the substances will increase the rate of the chemical reaction.
I hope it helps, Regards.
Prepare three test tubes containing reactant A. Prepare three test tubes containing reactant B. Add one test tube of reactant B and one unknown to one test tube of reactant A. Repeat for the other two unknowns. Time the reaction until bubbling stops. The unknown that causes the reaction to occur the quickest is the catalyst.
B) nodes
C) polyps
D) adenoids
E) peyer patches