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Why would glucose give positive result upon prolonged heating with seliwanoff's reagent?
Glucose gives a positive result with Seliwanoff's reagent upon prolonged heating because it is a reducing sugar that can reduce the reagent, leading to the formation of a cherry-red complex. This occurs due to the dehydration of glucose under acidic conditions, producing furfural, which then reacts with the reagent. The prolonged heating enhances this reaction, resulting in the characteristic color change indicative of a positive result.
What else can I help you with?
Does benedict's solution need heating when testing for glucose?
Yes, Benedict's solution needs heating to test for glucose. Heating helps to facilitate the reaction between glucose and the copper ions in the Benedict's solution, resulting in a color change that indicates the presence of glucose.
How do you prepare seliwanoffs reagent?
To prepare Seliwanoff's reagent, dissolve resorcinol in concentrated hydrochloric acid, then add a small amount of acetaldehyde. Mix well and dilute with water if needed. This reagent is used for differentiating between aldose and ketose sugars based on the color developed upon heating.
What is the positive result in barfoed's test?
A positive result in Barfoed's test is the formation of a brick-red precipitate within 1-2 minutes upon heating a solution of the carbohydrate being tested with Barfoed's reagent (copper acetate in acetic acid). This indicates the presence of a monosaccharide, particularly glucose or fructose, in the solution.
What compounds are formed by Prolonged heating of glycine at 170 degrees?
Some compounds that are formed by prolonged heating of glycine are glycyl-glycine, alaine, aspartic acid, methylamine, oxalic, and diketopiperazine. For these compounds to form, the glycine needs to be heated at 170 degrees celsius.
How do you change sucrose to glucose?
Sucrose is a disaccharide composed of glucose and fructose. A sucrase will hydrolyze sucrose into both constitute parts. You will be left with glucose and fructose, but you cannot directly transform sucrose to glucose.
Why sucrose does not give a positive Benedict's test but hydrolyzed sucrose does give a positive beneditcts test?
Sucrose is formed from glucose and fructose.Sucrose is formed from glucose and fructose. Glucose and fructose gives positive test for benedict becuz both of them are reducing sugars whereas sucrose is not a reducing sugar so it gives negative test for benedict. On prolonged heating,sucrose will form glucose and fructose (reducing sugars)which ultimately gives a positive result .
Explain why the iodine test gave such results upon prolonged heating?
explain why the iodine test gave such results upon prolonged heating
Does benedict's solution need heating when testing for glucose?
Yes, Benedict's solution needs heating to test for glucose. Heating helps to facilitate the reaction between glucose and the copper ions in the Benedict's solution, resulting in a color change that indicates the presence of glucose.
How do you prepare seliwanoffs reagent?
To prepare Seliwanoff's reagent, dissolve resorcinol in concentrated hydrochloric acid, then add a small amount of acetaldehyde. Mix well and dilute with water if needed. This reagent is used for differentiating between aldose and ketose sugars based on the color developed upon heating.
What is the positive result in barfoed's test?
A positive result in Barfoed's test is the formation of a brick-red precipitate within 1-2 minutes upon heating a solution of the carbohydrate being tested with Barfoed's reagent (copper acetate in acetic acid). This indicates the presence of a monosaccharide, particularly glucose or fructose, in the solution.
Are solar heating system classified as positive and negative?
yes
What compounds are formed by Prolonged heating of glycine at 170 degrees?
Some compounds that are formed by prolonged heating of glycine are glycyl-glycine, alaine, aspartic acid, methylamine, oxalic, and diketopiperazine. For these compounds to form, the glycine needs to be heated at 170 degrees celsius.
How do you detect glucose in a plant's leaf?
In order to detect glucose in a plant's leaf, you will need several items, including leaves, a beaker, a boiling tube, Tollen's reagent, and Fehling's reagent. If the leaf contains glucose, the test-tube containing the Tollen's reagent will turn a silver color.
What is a ptc heating element?
A PTC (Positive Temperature Coefficient) heating element is a type of heating element that increases resistance as temperature rises. This characteristic allows the heating element to self-regulate its temperature, providing a safety feature to prevent overheating. PTC heating elements are commonly used in appliances such as hair dryers, irons, and space heaters.
How do you change sucrose to glucose?
Sucrose is a disaccharide composed of glucose and fructose. A sucrase will hydrolyze sucrose into both constitute parts. You will be left with glucose and fructose, but you cannot directly transform sucrose to glucose.
Is heating liquid honey a change of state?
No. Simply heating honey, while making it less viscus, does not change its state. It remains a liquid. Unless heating is prolonged enough to cause evaporation, the honey will remain a liquid, so no change of state occurs by simply heating.
What are positive and negative effects of ash fall?
positive: gives nutrient soil and gives free heating. negative: kills people and ash is poisonous.
