Question

In: Chemistry

1-An unknown sample does not react with Jones' reagent, does not react with Benedict's reagent, forms...

1-An unknown sample does not react with Jones' reagent, does not react with Benedict's reagent, forms a precipitate when dinitrophenylhydrazine is added to it, but does not form a yellow precipitate after performing the iodoform test. The unknown is Select one:

a. Benzaldehyde

b. Ethanol

c. 3-pentanone

d. Acetone

e. Hexanal

f. Glucose

2- An unknown is either glucose or hexane. Which of these tests could you use to decide ?

a. Jones' test

b. Benedict's test

c. DNP test

d. Iodoform test

3- Which of these compounds will yield a positive test with the Jones' reagent?

Select one:

a. 3-Butanone

b. Benzaldehyde

c. 2,4-dimethylpentane

d. 2,2-dimethylpropanol

e. Benzene

4- what two impurities are most likely to be present in the asprone that you prepared? Use the results of the FeCI3 test any observed odor to help answer the question?

5- If your % yield is less than 100%, what may account for this ? Be as specific as possible. If your % yield is over 100%, what may account for this? Be as specific as possible

Expert Solution

queen_honey_blossom answered 2 years ago

1.) An unknown carbohydrate solution tested positive with molisch reagent, formed a red precipitate with barfoed's...

1.) An unknown carbohydrate solution tested positive with molisch reagent, formed a red precipitate with barfoed's reagent within 3 minutes, and turned blue-green when mixed with bials reagent. what carbohydrate is this? 2.) Erythrose is a four-carbon aldose. Describe the results of testing it with the following reagents. a.) Molisch b.) Barfoed's c.) Benedict's d.) Seliwanoff's

Sanger's reagent, DNFB, is known to react with phenolic, imidazole, and free amino groups. With this...

Sanger's reagent, DNFB, is known to react with phenolic, imidazole, and free amino groups. With this in mind, would it be possible to determine the N and C terminals of a dipeptide composed of tyrosine and lysine?

From the choices provided below, list the reagent(s) in order that will react with 3- pentanone...

From the choices provided below, list the reagent(s) in order that will react with 3- pentanone to form 2,3-pentanediol. (List your answer as a letter (single-step transformation), or series of letters (multi-step transformation in the order the reagents are used, with no commas separating them. No more than four steps are required for this synthesis.)

A 2.47×10-1 g sample of HCl and a 8.82 g sample of O2 react in a...

A 2.47×10-1 g sample of HCl and a 8.82 g sample of O2 react in a closed 2.25 L container at 487 K, according to the following balanced chemical equation: 4HCl(g) + O2(g) → 2H2O(l) + 2Cl2(g) Calculate the PCl2 (in atm) in the container after the reaction has gone to completion.

1. A sample contains both KBr and KI in unknown quantities. If the sample has a...

1. A sample contains both KBr and KI in unknown quantities. If the sample has a total mass of 5.30 g and contains 1.38 g K, what are the percentages of KBr and KI in the sample by mass?

Five ul of a 10-to-1 dilution of a sample were added to 3ml of Bradford reagent....

Five ul of a 10-to-1 dilution of a sample were added to 3ml of Bradford reagent. The absorbance at 595 nm was 0.78 and, according to a standard curve, correpsonds to 0.015mg of protein on the x axis. What is the protein concentration of the original solution?

Jones Matrices: A beam of light with unknown state of polarization serves as the start to...

Jones Matrices: A beam of light with unknown state of polarization serves as the start to produce light beams of well-defined polarization with the aid of one or a combination of polarizing devices at your disposal (linear polarizer, quarter-wave-plates, half- wave-plates, wave-plates with any other phase shifts than 90° or 180°, rotator, etc) E~ = < ? ,?e^(i??not) > What device or combination of devices will you use to produce a linearly polarized light along y-axis if losing some of...

1. When σ is unknown and the sample is of size n ≥ 30, there are...

1. When σ is unknown and the sample is of size n ≥ 30, there are two methods for computing confidence intervals for μ. Method 1: Use the Student's t distribution with d.f. = n − 1. This is the method used in the text. It is widely employed in statistical studies. Also, most statistical software packages use this method. Method 2: When n ≥ 30, use the sample standard deviation s as an estimate for σ, and then use...

Which reagents react with reducing sugars (but not non-reducing sugars), indicate each reagent that reacts (5...

Which reagents react with reducing sugars (but not non-reducing sugars), indicate each reagent that reacts (5 points): (i) Millon's reagent, (ii) Bradford’s reagent, (iii) Benedict’s reagent, (iv) Barfoed’s reagent, (v) Biuret reagent

a) Why does the ketone (1-indanone) react with the base, but the aldehyde (3,4- dimethoxybenzaldehyde) does...

a) Why does the ketone (1-indanone) react with the base, but the aldehyde (3,4- dimethoxybenzaldehyde) does not? b) Why is the α-proton so acidic? (You must support your argument with appropriate drawings).