Homework Answers
Starch can be transformed into a substance which gives a negative iodine test and a positive Benedict's test by treating the starch with dilute hydrochloric acid.
Reason: Acid hydrolyses the glycosidic bond present in the starch which convert starch into glucose which is a reducing sugar and thus it gives negative iodine test and a positive Benedict's test.
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5. How can you transform starch into a substance that gives a negative iodine test and...
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
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
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...
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...
4. Amyloso gives a positive iodine test and a negative test with Fehling's reagent. On the...
4. Amyloso gives a positive iodine test and a negative test with Fehling's reagent. On the basis of the structure of amylose, explain the results of the two tests.
Question 39 2 pts To test for the presence of starch, iodine can be used. A...
Question 39 2 pts To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened? Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution. Due to...
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.
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?
need help with questions 5 and 6 5. A mixture of starch and iodine (12) turns...
need help with questions 5 and 6
5. A mixture of starch and iodine (12) turns blue because a. starch is blue b. iodine (12) is blue c. starch is a chain of glucose molecules d. iodine (12) interacts with coiled starch molecules e. copper (II) ion is reduced to copper (I)ion 6. Suppose that when you test your original diluted saliva with starch-iodine, it takes 20 minutes for the color to change. You should a. add more water to...
you will be performing an iodine test for the presence of starch in the slab what observation in this experiment will te...
you will be performing an iodine test for the presence of starch in the slab what observation in this experiment will tell you when all starch has been hydrolyzed into simpler products
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...
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...
4. Amyloso gives a positive iodine test and a negative test with Fehling's reagent. On the basis of the structure of amylose, explain the results of the two tests.
Question 39 2 pts To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened? Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution. Due to...
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.
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?
need help with questions 5 and 6
5. A mixture of starch and iodine (12) turns blue because a. starch is blue b. iodine (12) is blue c. starch is a chain of glucose molecules d. iodine (12) interacts with coiled starch molecules e. copper (II) ion is reduced to copper (I)ion 6. Suppose that when you test your original diluted saliva with starch-iodine, it takes 20 minutes for the color to change. You should a. add more water to...
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