Homework Answers
Amylose reacts with iodine to form starch - tried iodide complex which give deep blue in colour. This color is due to formation of starch iodine complex.
Fehling's test is used to determine the reducing sugar. Thus all reducing monosaccharide sugars give positive fehling's test. All poly sachharides are non reducing in nature. Hence they give negative results for amylose.amylose has only one reducing end. Hence it is non detectable as the concentration is too low. Thus Thus negative test.
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4. Amyloso gives a positive iodine test and a negative test with Fehling's reagent. On the...
Can the iodine test distinguish between amylose and amylopectin? What Would you look for? Can sucrose...
Can the iodine test distinguish between amylose and amylopectin? What Would you look for? Can sucrose act as a reducing sugar? Explain your answer. In the acid-catalyzed hydrolysis of starch, how can you tell when the hydrolysis of starch is complete? Why does the test work this way? What is the monosaccharide that results at the end? Polysaccharides generally do not give a positive test with Fehling's solution. Why?
A. SOLUBILITY Conclusion Carbohydrate Observation(s) Starch Glucose Sucrose B. FEHLING'S AND IODINE TESTS 1% Sugar/Starch Fehling's...
A. SOLUBILITY Conclusion Carbohydrate Observation(s) Starch Glucose Sucrose B. FEHLING'S AND IODINE TESTS 1% Sugar/Starch Fehling's Test Observation's and Conclusion Todine Test Observation(s) and Conclusion Glucose Lactose Sucrose Starch
5. How can you transform starch into a substance that gives a negative iodine test and...
5. How can you transform starch into a substance that gives a negative iodine test and a positive Benedict's test?
3. When tested with iodine (12) a. starch gives a positive result and glucose gives a...
3. When tested with iodine (12) a. starch gives a positive result and glucose gives a positive result b. starch gives a negative result and glucose gives a positive result c. starch gives a positive result and glucose gives a negative result d. starch gives a negative result and glucose gives a negative result
please help me answer the following questions 33 DE CARBOHYDRATES THE Starch Carbohyd- rate class monosacchetides P...
please help me answer the following questions
33 DE CARBOHYDRATES THE Starch Carbohyd- rate class monosacchetides Precipitate PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Glucose Fructose Sucrose Benedict's Grick red Brick red negative negative test blues (blue) Fehling's Positive Positive Negativ test burnt orange brown l Tollens negative regate negative test clearish cleau clear Glucose oxidase test Iodine dark test blue negative | reaction mono saccharid sitive What class of carbohydrate can be expected to give...
Observations. Indicate whether each test was positive or negative and indicate what color each solution was...
Observations. Indicate whether each test was positive or negative and indicate what color each solution was after performing the tests. Describe what caused the observed results in the Benedict's Test for starch/saliva vs. starch buffer mixtures. Describe what caused the observed results in the iodine test for the starch/saliva vs. starch/buffer mixtures.
Which of the following sugars would NOT yield a positive Fehling's test (red color change)? Which...
Which of the following sugars would NOT yield a positive Fehling's test (red color change)? Which of the following sugars would NOT yield a positive Fehling's test (red color change)? lactose maltose sucrose All of the listed responses would yield a positive result.
A student analyzes a sample which produces a positive Molisch Test followed by a negative Iodine/Potassium...
A student analyzes a sample which produces a positive Molisch Test followed by a negative Iodine/Potassium Iodide Test followed by a positive Benedict's Test followed by a positive Barfoed's Test followed by a positive Seliwanoff's Test. The sample is: A. a starch B. a ketose C. an aldose which does NOT have five carbons D. none of the above
QUESTION 20 Compound "A" exhibits the following chemical properties: It gives a negative Benedict's reagent test...
QUESTION 20 Compound "A" exhibits the following chemical properties: It gives a negative Benedict's reagent test It forms a yellow precipitate, CHI3, when treated with 12 / OH-(with heating). When compound "A" is treated with LDA/THF (-78°C), a salt is formed that reacts with benzyl bromide to form compound "B" shown below! What is the structure of compound "A"? compound B benzyl bromide 5 OY = oooo = =
Experiment 33 PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Sucrose Carbohyd- Starch...
Experiment 33 PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Sucrose Carbohyd- Starch Fructose Glucose rate class Benedict's test Fehling's test Tollens test Glucose oxidase test Iodine test What class of carbohydrate can be expected to give a positive test with the spot tests below? Benedict's glucose oxidase Fehling's iodine Tollens Hydrolysis of polysaccharides Test Results Results of Result from Benedict's test strips Solution Result from iodine test Initial starch Initial sucrose Initial cellulose Final starch Final...
Can the iodine test distinguish between amylose and amylopectin? What Would you look for? Can sucrose act as a reducing sugar? Explain your answer. In the acid-catalyzed hydrolysis of starch, how can you tell when the hydrolysis of starch is complete? Why does the test work this way? What is the monosaccharide that results at the end? Polysaccharides generally do not give a positive test with Fehling's solution. Why?
A. SOLUBILITY Conclusion Carbohydrate Observation(s) Starch Glucose Sucrose B. FEHLING'S AND IODINE TESTS 1% Sugar/Starch Fehling's Test Observation's and Conclusion Todine Test Observation(s) and Conclusion Glucose Lactose Sucrose Starch
5. How can you transform starch into a substance that gives a negative iodine test and a positive Benedict's test?
3. When tested with iodine (12) a. starch gives a positive result and glucose gives a positive result b. starch gives a negative result and glucose gives a positive result c. starch gives a positive result and glucose gives a negative result d. starch gives a negative result and glucose gives a negative result
please help me answer the following questions
33 DE CARBOHYDRATES THE Starch Carbohyd- rate class monosacchetides Precipitate PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Glucose Fructose Sucrose Benedict's Grick red Brick red negative negative test blues (blue) Fehling's Positive Positive Negativ test burnt orange brown l Tollens negative regate negative test clearish cleau clear Glucose oxidase test Iodine dark test blue negative | reaction mono saccharid sitive What class of carbohydrate can be expected to give...
Observations. Indicate whether each test was positive or negative and indicate what color each solution was after performing the tests. Describe what caused the observed results in the Benedict's Test for starch/saliva vs. starch buffer mixtures. Describe what caused the observed results in the iodine test for the starch/saliva vs. starch/buffer mixtures.
QUESTION 20 Compound "A" exhibits the following chemical properties: It gives a negative Benedict's reagent test It forms a yellow precipitate, CHI3, when treated with 12 / OH-(with heating). When compound "A" is treated with LDA/THF (-78°C), a salt is formed that reacts with benzyl bromide to form compound "B" shown below! What is the structure of compound "A"? compound B benzyl bromide 5 OY = oooo = =
Experiment 33 PART B. SOME REACTIONS OF CARBOHYDRATES Spor Test Results with Carbohydrates Sucrose Carbohyd- Starch Fructose Glucose rate class Benedict's test Fehling's test Tollens test Glucose oxidase test Iodine test What class of carbohydrate can be expected to give a positive test with the spot tests below? Benedict's glucose oxidase Fehling's iodine Tollens Hydrolysis of polysaccharides Test Results Results of Result from Benedict's test strips Solution Result from iodine test Initial starch Initial sucrose Initial cellulose Final starch Final...
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