Homework Answers
(3). The purpose of testing water in the rxn with seliwanoff's reagent to prove that distilled water has no sugar in it . Iodine test is done to identify starch in the water .
they act as a control for a negative test for starch and sugars .
(4). Seliwanoff's test is a chemical test which distinguish btw aldose and ketose sugars.
This test is given positive by ketohexose ; so it is given by fructose , sucrose but glucose is aldohexose so it wont give this test.
so we can distinguish btw glucose and fructose by saliwanoff test
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3. What is the purpose of testing water in the reaction with Seliwanoff's reagent and with...
PRE-LABORATORY ASSIGNMENT Carbohydrates 1. Draw the structures of fructose (ring structures) present in a solution at...
PRE-LABORATORY ASSIGNMENT Carbohydrates 1. Draw the structures of fructose (ring structures) present in a solution at equilibrium. 2. An unknown carbohydrate showed a positive test reaction when tested with Fehling's reagent, turned red when reacted with Seliwanoff's reagent, and reacted quickly with Barfoed's reagent. What conclusions can be made about this compound? 3. What test could be used to differentiate between the compounds in each set? a. sucrose and maltose b. fructose and glucose c. lactose and glucose
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use...
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use open chain Fisher projection). 2. Do you expect fructose to give a positive reaction with Barfoed's reagent? Explain why or why not. Indicate which of the test carbohydrates (glucose, fructose, lactose, sucrose, starch) would give 5- hydroxymethylfurfural when heated with hydrochloric acid. (See description of reactions for Barfoed's reagent and Seliwanoffs reagent). 3. 121
(You will need to know what Benedict’s reagent is, the reaction conditions that are used and...
(You will need to know what Benedict’s reagent is, the reaction conditions that are used and how to interpret the experimental results.Please consider the scenario that you are working in an analytical laboratory and need to determine if a sample of synthetic sucrose is 100% pure.) 1. You ran two control experiments using the reagent; one with commercially purchased pure glucose and one with commercially purchase pure fructose. What would you expect the experimental results to show for the glucose...
1. Why does the basic (ammonia) reaction condition used with the Benedict's reagent test enable you...
1. Why does the basic (ammonia) reaction condition used with the Benedict's reagent test enable you to differentiate a possible hydrolysis of a pure synthetic sucrose sample from an incomplete synthesis of a sucrose sample in which glucose and fructose might still be present in low amounts?
(1) De (2) Wh in water? (3) What is the purpose of washing with water after...
(1) De (2) Wh in water? (3) What is the purpose of washing with water after extraction with a reaction solvent? (4) What is the purpose of using a tared test tube? (5) W (6) What is the purpose of using a porous plate? (7) Why should a piece of weighing paper be put under the porous plate? (8) Why should you not touch the crystals with your fingers? fine: take up, wash with water, drying agent, absorb, mother liquor...
What Was - starch hydrolysis results in formation of Formed glucose, fructose etc. based on the...
What Was - starch hydrolysis results in formation of Formed glucose, fructose etc. based on the enzym Upon I mode of action. The color of Fehlings Digestion? sovhon turns to yedbi cause the Sugarne - copped (11) to copper in fenungs sowho PROBLEMS 1. What purpose does amylase serve in the hydrolysis of starch? Why did the color of the iodine test change over time? Be specific about the reaction that is occurring (substrate and product). 2. Should there be...
Observations seemed to be off, how would the structural formula influence my observations and what would...
Observations seemed to be off, how would the structural
formula influence my observations and what would the balanced
equations be for the different solutions?
IIIB. Oxidation reaction with Fehling's solution-(Cu2 /Cu Aldehydes can be further oxidized to carboxylic acids by mild oxidizing agents such as Cu ions. Ketones do not undergo this reaction. One such mild oxidizing reagent is Fehling's solution, a solution of copper sulfate (CuSO4) mixed with an alkaline solution of sodium-potassium tartrate. In the process Cu?+ is...
Question 3 of 25 Glycolysis occurs within the _____ . A. nucleus B. cytoplasm C. vacuoles...
Question 3 of 25 Glycolysis occurs within the _____ . A. nucleus B. cytoplasm C. vacuoles D. mitochondria Question 1 of 25 Blood sugar _____. A. testing can be inferred by the glucosuria test of the perspiration B. is a term that normally refers to the concentration of glucose and fructose in the blood C. should be in the range of 70-90 mg/mL or the renal threshold is exceeded D. is regulated by the liver which removes glucose from the...
Please, fill in first table for Seliwanoff's Test for Ketoses. Additional info is found in the...
Please, fill in first table for Seliwanoff's Test for Ketoses.
Additional info is found in the images following table. (Second
table is info and image following).
Part C: Seliwanoff's Test for Ketoses Seliwanoff's Test Results Test Tube Sample Prediction Ketose? (Y/N) Observations Distilled water Peach / no change Glucose Peach to red slowly Fructose deep red solution very quickly Sucrose deep red solution quickly Lactose Peach to red slowly Starch Peach to red very slowly Mystery sample Peach to red...
The hydrolysis of table sugar (sucrose) occurs by the following overall reaction sucrose + water →...
The hydrolysis of table sugar (sucrose) occurs by the following overall reaction sucrose + water → glucose + fructose and is first order in sucrose concentration with a rate constant of 3.50 * 10 min?. If a 0.500 M solution of sucrose is allowed to react for 125 min, what will be the average rate of production of glucose over that period of time in units of M/min?
PRE-LABORATORY ASSIGNMENT Carbohydrates 1. Draw the structures of fructose (ring structures) present in a solution at equilibrium. 2. An unknown carbohydrate showed a positive test reaction when tested with Fehling's reagent, turned red when reacted with Seliwanoff's reagent, and reacted quickly with Barfoed's reagent. What conclusions can be made about this compound? 3. What test could be used to differentiate between the compounds in each set? a. sucrose and maltose b. fructose and glucose c. lactose and glucose
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use open chain Fisher projection). 2. Do you expect fructose to give a positive reaction with Barfoed's reagent? Explain why or why not. Indicate which of the test carbohydrates (glucose, fructose, lactose, sucrose, starch) would give 5- hydroxymethylfurfural when heated with hydrochloric acid. (See description of reactions for Barfoed's reagent and Seliwanoffs reagent). 3. 121
(1) De (2) Wh in water? (3) What is the purpose of washing with water after extraction with a reaction solvent? (4) What is the purpose of using a tared test tube? (5) W (6) What is the purpose of using a porous plate? (7) Why should a piece of weighing paper be put under the porous plate? (8) Why should you not touch the crystals with your fingers? fine: take up, wash with water, drying agent, absorb, mother liquor...
What Was - starch hydrolysis results in formation of Formed glucose, fructose etc. based on the enzym Upon I mode of action. The color of Fehlings Digestion? sovhon turns to yedbi cause the Sugarne - copped (11) to copper in fenungs sowho PROBLEMS 1. What purpose does amylase serve in the hydrolysis of starch? Why did the color of the iodine test change over time? Be specific about the reaction that is occurring (substrate and product). 2. Should there be...
Observations seemed to be off, how would the structural
formula influence my observations and what would the balanced
equations be for the different solutions?
IIIB. Oxidation reaction with Fehling's solution-(Cu2 /Cu Aldehydes can be further oxidized to carboxylic acids by mild oxidizing agents such as Cu ions. Ketones do not undergo this reaction. One such mild oxidizing reagent is Fehling's solution, a solution of copper sulfate (CuSO4) mixed with an alkaline solution of sodium-potassium tartrate. In the process Cu?+ is...
Please, fill in first table for Seliwanoff's Test for Ketoses.
Additional info is found in the images following table. (Second
table is info and image following).
Part C: Seliwanoff's Test for Ketoses Seliwanoff's Test Results Test Tube Sample Prediction Ketose? (Y/N) Observations Distilled water Peach / no change Glucose Peach to red slowly Fructose deep red solution very quickly Sucrose deep red solution quickly Lactose Peach to red slowly Starch Peach to red very slowly Mystery sample Peach to red...
The hydrolysis of table sugar (sucrose) occurs by the following overall reaction sucrose + water → glucose + fructose and is first order in sucrose concentration with a rate constant of 3.50 * 10 min?. If a 0.500 M solution of sucrose is allowed to react for 125 min, what will be the average rate of production of glucose over that period of time in units of M/min?
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