Imagine that we heated the starch with H2SO4 for about 2 hours. What would you expect for the results with the Iodine test on this heated starch solution?
Q: The reaction in Fohl’s test will cause the formation of what compound? What type of reaction happens…
A: Fohl's test is the biochemical test of proteins for the detection of presence of Aminoacids with…
Q: You were instructed to add 0.2 ml of kombucha to 9.8 ml of fresh tea, but instead added 2.0 ml of…
A: Dilution is defined as the ratio of stock volume to the final volume. Here, final volume is the sum…
Q: DESCRIBE THE RESULTS OF THE REDUCTION TEST FOR SUGARS USING THE FOLLOWING TEST BENEDICTS TEST SUGAR…
A: Benedict's test is a qualitative test that is used to detect the presence of reducing carbohydrates.…
Q: Why does glucose not give positive results with an iodine test but not starch?
A: The iodine-starch test is a chemical reaction that is used to presence of starch which gives intense…
Q: Given several unknown solutions, you are asked to use your knowledge of nutrient tests to identify…
A: Note- according to our guild line we are supposed to answer only one question. Please repost the…
Q: Write a description of the physical characteristics of the isolated starch and glycogen. Provide the…
A: Physical characteristics are observable characteristics of a substance. Starch and glycogen are…
Q: What will you observe when samples of these fats and oils are tested for unsaturation with bromine…
A: Fatty acids are building blocks of fats. Fats are one of the major biomolecules. Fatty acids can be…
Q: You obtained the following raw data when setting up a Bradford standard curve: BSA (mg/ml)…
A: Proteins are composed of twenty standard amino acids that differ from each other in their side-chain…
Q: You obtained the following raw data when setting up a Bradford standard curve: BSA (mg/ml) 0 1 2 3 4…
A: The biuret assay can be used for quantitative determination of total protein concentration by…
Q: Given: 2KI +Pb(NO3)2 --> PbI2 + 2KNO3. How many grams of lead (II) iodide are produced if 0.250…
A: 2KI +Pb(NO3)2 --> PbI2 + 2KNO3 Thus, 2moles of KI with 1mole of Pb(NO3)2 gives 1 mole of PbI2…
Q: How should the manufacturer design the experiment? In order to compare the strength of the film and…
A: Starch films usually contain amylose, amylopectin, water, andor other plasticizers, and they are…
Q: DESCRIBE THE RESULTS OF THE REDUCTION TEST FOR SUGARS USING THE FOLLOWING TEST MOLISCH’S TEST SUGAR…
A: Carbohydrates or sugars are the most abundant biopolymers in living organisms. Carbohydrates are…
Q: You want to feed a new flask @: 2 x 105 cells/mL, 8 mL total per flask. Describe how you dilute your…
A: Viable or the live cells can be counted by the instrument called the hemocytometer. These live cells…
Q: DESCRIBE THE RESULTS OF THE REDUCTION TEST FOR SUGARS USING THE FOLLOWING TEST MOORE’S TEST SUGAR…
A: Carbohydrates are one of the essential macronutrients for our body and form the major component of a…
Q: A carbohydrate sample reacts positively with all test reagents except for Lugol's. The sample could…
A: Carbohydrates are the chief biomolecules which act as energy source. Most of the body cells depend…
Q: Which test can be used to differentiate starch and sucrose? Benedict’s Test Seliwanoff’s…
A: Introduction: Starch is a carbohydrate commonly found in nature and one of the primary sources of…
Q: Starch solutions must be made-up fresh before an experiment. A week-old starch solution tested…
A: Starch is a storage form of a polysaccharide found in plant products.
Q: In a spectrophotometer, what should be the appearance on the graph if the sample is pure? presence…
A: Spectrophometry is a widely used technique in identification and confirmation of chemical…
Q: You conduct Lugol's iodine test to determine if starch is present in a solution. The solution…
A: The food components contain different biomolecules including carbohydrates, fats, proteins and…
Q: You conduct Lugol's iodine test to determine if starch is present in a solution. The solution…
A: Answer ; Starch is not present in the solution. - in iodine starch test we get orange or yellow…
Q: Trans-oleic acid (18:1,D9) has a melting temperature of (44.5C) and cis-oleic acid (18:1,D9) has a…
A: A cis arrangement implies that when there is a double bond, the neighboring carbon atoms are on the…
Q: Does the product of starch hydrolysis still contain polysaccharides? What test could have done to…
A: Starch is a carbohydrate consisting of large number of glucose units joined together by glycosidic…
Q: Trans-oleic acid (18:1,D9) has a melting temperature of (44.5C) and cis-oleic acid (18:1,D9) has a…
A: Oleic acid is an 18 carbon long mono-unsaturated fatty acid which bears double bond at carbon number…
Q: need to dissolve cholesterol in Chloroform in the Liebermann-Burchard Test
A: The reaction of acetic anhydride in chloroform with unsaturated steroids (e.g. cholesterol) in the…
Q: Which of the following tests gives bluish green product due to the presence of carbohydrates?*…
A: Carbohydrates are polyhydroxy aldehydes or polyhydroxy ketones. Monomers of carbohydrates i.e.,…
Q: In the third video, glucose, glycine and maltose are tested as samples with the Benedict's reagent.…
A: Introduction: The benedict is used for the detection of simple carbohydrates. It identifies the…
Q: Explain the color changes observed throughout the peroxide value of oil experiment. Materials: 1.…
A: The unsaturated fat when undergoing oxidation forms peroxide so the peroxide value denotes the…
Q: DESCRIBE THE RESULTS OF THE REDUCTION TEST FOR SUGARS USING THE FOLLOWING TEST SELIWANOFF’S TEST…
A: Seliwanoff's test is used to distinguish between aldolases and ketoses. Sugars with ketone groups…
Q: 5b. Weight of 20 tablets (in mg) selected randomly is given below: Tablet no Weight (mg) Tablet…
A: To answer first we have to find the uniformity of weight of tablets. This involves calculation of…
Q: Give the positive result for the test of ribose Give the positive result for the test of…
A: Since you have asked a question with multiple subparts, we will answer only three subparts for you.…
Q: Mn (s) + 2 CuCl (aq) --> 2 Cu (s) + MnCl2 How many grams of Cu will be produced by 2.9 moles of Mn?…
A: In the question, the given reaction is: Mn (s) + 2 CuCl (aq) --> 2 Cu (s) + MnCl2. The Cu…
Q: Will disaccharides and polysaccharides give a positive result for Molisch test?
A: Carbohydrates are classified into Monosaccharides, Oligosaccharides, and polysaccharides.…
Q: What is the detection principle of iodine test for starch
A: The iodine test is a quantitative analysis of carbohydrates to distinguish polysaccharides from…
Q: Match the qualitative test results to the sample identity in the table below. Give its structure and…
A: Biomolecules are organic compounds produced by living organisms. They play important function as…
Q: a) Four solutions were made up; one containing glucose, one containing starch, one containing…
A: Lipids are hydrocarbon-containing molecules that make up the building blocks of living cells'…
Q: how would you prepare 600 mL of a 20% strach solution beginning with a 50% stock starch solution?…
A: For calculation of stock solution, the formula used is M1V1 = M2V2 Where the M and V refer to the…
Q: Add milk to the test tube until the pH reaches 10 • Wait 5 minutes . Use iodine to test for starch…
A: Salivary amylase is an enzyme produced by the salivary glands and it is secreted into the mouth. It…
Q: 1. A.) Which compound acts as dehydrating agent in Molisch's test? B.) With the correct answer…
A: Disclaimer: Since you have posted a question with multiple sub-parts, we will solve first three…
Q: You obtained the following raw data when setting up a Bradford standard curve: BSA (mg/ml) 0 1 2 3 4…
A: Even when the concentration of BSA (Bovine Serum Albumin) is 0 , an absorbance of 0.225 was…
Q: Which of the following WILL PROMOTE sol formation of neutral polysaccharide sample? a. place the…
A: Polysaccharides are used for hydrogel formation nowadays which is diversely used in the field of…
Q: The hydrolysis of starch was stopped when the iodine test no longer gave a blue color. Does this…
A: Starch is a complex carbohydrate, which is made up of amylose and amylopectin subunits. Since…
Q: If I had a standard with 2.0 mL of Bradford reagent then added 50μL of 250 μL/mL ; what would be the…
A: The Bradford protein assay is commonly used due to its sensitivity, speed, convenience, lack of a…
Q: An unknown sample was titrated with CH3COOH. After making the titration curve, no steep change was…
A: CH3COOH is a weak acid hence it will not dissociate completely in the aqueous solution to form…
Q: Discuss the results and observations in a regular laboratory experiments the denaturation of: 1.…
A: 1) Acetone and proteins: organic solvents with the mutual attraction of nonpolar groups.…
Q: The decomposition reaction of atmospheric peroxyacetylnitrate (PAN) to products was studied, and the…
A: Arrhenius equation K = Ae-E/RT ln K = lnA +(-E/R)(1/T) Slope = lnK/(1/T) Y-intercept = lnA K1 =…
Q: DESCRIBE THE RESULTS OF THE REDUCTION TEST FOR SUGARS USING THE FOLLOWING TEST BARFOEDS TEST SUGAR…
A: Carbohydrates are composed of carbon, hydrogen, and oxygen atoms in a ratio of 1:2:1 respectively.…
Q: How many ml of a 40% solution can be prepared from 42.8 mg of sucrose? How many ml of a 40% solution…
A: Given: Percent of solution = 40% Amount of sucrose= 42.8 mg
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A paste of starch was tested using Benedict’s test, the Iodine Test, and Fehling’s Test. Before hydrolysis, Benedict’s test and Fehling's test results were both negative while Iodine’s test is positive. After adding 0.5 mL of conc. HCl to the paste, another 5 drops of NaOH were added and was tested using Fehling’s, Benedict’s Test, and Iodine Tests. What would be the theoretical result of the three different tests? Explain the chemical reaction that happened and the principle/mechanism behind the reactions.A certain amount of white solid was dissolved in enough water and gives a colorless solution. A portion of the solution was added with 15% solution of alpha-naphthol solution and a few drops of conc. H2SO4 forming a violet-colored ring. Another portion was added with drops of Seliwanoff’s reagent and showed no change after being warmed in a bath. Another portion was added with equal amounts of Fehling’s A and B reagent giving a red precipitate in a blue solution after warming in a bath. a) Cite an experimental result confirming that the solid is a carbohydrate b) Is the solid starch, fructose or glucose? Support your answer.You have prepared the following serial dilution using tryptone broth:d1: 0.1ml culture + 9.9 ml brothd2: 300µl d1 + 4.7 ml brothd3: 0.2ml d2 + 9800 µl broth1) Write your dilutions as a rational number AND in scientific format? What was your total dilution (in scientific notation)?2) What was the original concentration of your culture if you spread 0.1 ml of d3 and counted360 cfu?
- The original concentration in a sample of kombucha is 2.79 x 10^6 CFU/ml. Which dilution would yield a countable plate? How would you make this? Show your calculations. Confused as to what's implied by "which dilution"? does it mean, how many times?Explain how acetaminopen gives such spectroscopic and chromatographic graph by interpreting the peaks that appeared in the graphs. Fig1. Mass Spectrometric Chromatogram of Acetaminophen (the two graphs) Fig2. IR Spectrograph of AcetaminophenThe hydrolysis of starch was stopped when the iodine test no longer gave a blue color. Does this mean that the starch was completely hydrolyzed? Explain.
- A student carries out the following experiments and records the following observations. 1. A few drops of a solution of KOH (aq) is added to a solution of Fe(NO3)3 (aq). A red gelatinous solid forms immediately upon addition. 2. A few drops of a solution of KOH (aq) is added to a solution of NaNO3 (aq). No changes are observed. 3. A few drops of a solution of KOH (aq) is added to a solution that could contain Fe3+(aq) and/or Na+(aq) ions (the solution could contain both ions, just one ion, or neither ions). A red gelatinous solid forms immediately upon addition. Select all of the answers that are consistent with the data from those 3 experiments. Group of answer choices The unknown contains Fe3+(aq) and Na+(aq) The unknown contains Fe3+(aq) It is not possible to determine the presence of Na+(aq) from this experiment The unknown contains neither Fe3+(aq) or Na+(aq)The standard curve to determine the amount of betacyanin is shown below. You extracted a red pigment from a beet disc (the mass of a disc is 2 g) using 10 ml of 20% ethanol solution. You measured absorbance of the solution above the beet disc every minute for a total time of 20 minutes. The increase in absorbance was linear during a period of time from 1 min to 10 min. The absorbance at 10 min was 0.8. Calculate the amount of betacyanin extracted from 1g of a beet tissue per minute. Explain your calculations. You can use Excel or a calculator.In kool aid chromatography, what factors affect the efficiency of the column? Also discuss the Van-Deemter equation.
- What do you think would happen if 0.5M K+ was used first to elute the sample in an ion exchange chromatography experiment? Why?The decomposition reaction of atmospheric peroxyacetylnitrate (PAN) to products was studied, and the following rates were obtained. Temperature, °C Rate constant, s1 0.00 5.60 x 10-6 10.0 3.20 x 10-5 20.0 1.60 x 10 4 30.0 7.60 x 10-4 43. Fit this data into the Arrhenius equation. Give the values of the following: Slope = ( Select ) y-intercept = I Select] Pearson coefficient (R) = [ Select ] activation energy of this reaction in kJ/mol = [Select ] collision frequency factor A = I Select]Cyclophosphamide, after reconstitution, has a concentration of 20 mg/mL. The patient, who weighs 67 kg and is 155 cm tall, is ordered cyclophosphamide in 250 mL NS. How many mL will be added to the bag?