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Which substance will give a red precipitate when heated with Fehling solution?
Wiki User
∙ 10y ago
Cu2O gives red ppt when heated with fehlings soln
Wiki User
∙ 10y ago
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What substance is given off when salt solution is heated gently?
mdhdshfjd
What chemical would you use to test food for glucose?
A fairly simple test is using clinistix- these are used for diabetes testing and available in any chemists, just dip them into any solution thought to contain glucose and they will turn from pink to purple (there are other colours available though)
Is a Solution that holds more solute than it normally would be saturated solution?
No, if it holds MORE than it should it is supersaturated.The term supersaturation refers to a solution that contains more of the dissolved material than could be dissolved by the solvent under normal circumstances.Saturation is the point at which a solution of a substance can dissolve no more of that substance (under normal circumstances) and additional amounts of it will appear as a precipitate.
What color does Benedicts solution turn when mixed with simple sugars?
Boil the solution after adding Benedict's reagent, the solution will turn orange in color. Jitender.
When a substance is heated what is it called?
Thermal Decomposition
What tests are used to test for the presence of starch and glucose?
for the starch iodine test is performed in which the starch reacts with iodine to produce dark blue colour which confirms the presence of starch. for glucose benedict's and fehling's test is performed. benedict's test: 1 ml sample is mixed with 1 ml of benedicts solution and the heated upto boiling if the colur changes to brick red then it confirms the presence of glucose fehling's test: similarly 1 ml fehling's solution I & fehling's solution II each in taken together and to it 1 ml of the sample is takenon then heated uptill boiling. if the colour changes to brick red the it confirms the presence of glucose.
What substance is given off when salt solution is heated gently?
mdhdshfjd
When glucose is heated what substance turns orange red?
Benedict's solution, I believe.
What does Tollens reagent Fehlings solution 2 4-Dinitrophenylhydrazine and Benedicts solution test for and what are the results?
Brady's reagent (2,4-DNP) forms a orange precipitate for all carbonyl compounds (C=O functional group), both aldehydes (primary) and ketones (secondary). However, recrystalisation of the orange precipitate gives characteristic melting points of the crystal for each carbonyl compound (therefore the presence of an orange precipitate indicates a carbonyl compound and the melting point of the crystallised precipitate indicates the type of carbonyl compound; aldehyde or ketone). Tollen's reagent (diamminesilver nitrate solution) is reduced and forms a silver mirror when heated with an aldehyde. It distinguishes between aldehydes and ketones as ketones do not react (no silver mirror formed) as they can not be oxidised further. Fehling's solution (copper II ions in sodium hydroxide) is reduced from a blue solution (Cu II ions) to a brick red precipitate (Cu I ions) when heated in the presence of an aldehyde. Ketones do not react as they can not be oxidised further. The Benedict's test is used in organic chemistry to distinguish between reducing sugars (brick red precipitate formed) and non-reducing sugars (no reaction).
What substance is given off when the salt solution is heated gently?
mdhdshfjd
What chemical would you use to test food for glucose?
A fairly simple test is using clinistix- these are used for diabetes testing and available in any chemists, just dip them into any solution thought to contain glucose and they will turn from pink to purple (there are other colours available though)
What type of substance is heated by radiation?
Any substance that absorbs the radiation is heated by it.
Does it take longer to saturate a heated solution than a cold solution?
No, a heated solution will saturate faster.
How can you test a substance to see if its water?
What is the enzyme that digests starch? Amylase digests starch into the disaccharide, maltose. What is the starch test? Grind the food up and add a few drops of iodine to the substance. If it contains starch then it will turn blue, black What colour dose the tests turn in the presence of starch? For the starch iodine test is performed in which the starch reacts with iodine to produce dark blue colour which confirms the presence of starch. for glucose benedict's and fehling's test is performed. benedict's test: 1 ml sample is mixed with 1 ml of benedicts solution and the heated upto boiling if the colur changes to brick red then it confirms the presence of glucose fehling's test: similarly 1 ml fehling's solution I & fehling's solution II each in taken together and to it 1 ml of the sample is takenon then heated uptill boiling. if the colour changes to brick red the it confirms the presence of glucose. Where is the enzyme found in the body? The enzyme breaks down starch into glucose? Like all enzymes, amylase is a catalyst, so it only speeds up reactions which would happen anyway. However, without the enzyme many reactions would be extremely slow. So starch could break down into glucose in the absence of amylase (provided water was present), but only very slowly.
Where did the substance that appeared at the bottom of the evaporating dish after it was heated come from?
It is likely the substance was a salt such as sodium chloride or copper sulphate that was in solution. When the water evaporated it left the solid salts behind.
When copper ii hydroxide and sodium nitrate is heated?
you make a black precipitate.
Why do proteins in cheese slurry precipitate when acidified or heated?
Nothing Dump ace's!
