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Observation the reaction of formaldehyde with tollen's reagent?
it is know as the silver mirror test, the overall half equation reaction is => CH2O + 2OH- ==> CH2O2 + H2O +2e- [Ag(NH3)2]+ + e- ==> Ag + 2NH3 CH2O + 2OH- + 2[Ag(NH3)2]+ ==> CH2O2 H2O + 2Ag +4NH3
When a strip of zinc metal is added to a test tube of hydrochloric acid the liquid forms bubbles and the test tube feels hot The bubbles are a result of the formation of hydrogen gas What does?
The reaction between zinc and hydrochloric acid produces zinc chloride and hydrogen gas. The bubbles observed are the hydrogen gas being released. The reaction is exothermic, which is why the test tube feels hot due to the heat generated during the reaction.
A mineral that contains calcium carbonate will provide a positive response to a test for?
Calcium carbonate-containing minerals will provide a positive response to a test for the presence of carbonate ions. When exposed to an acid, carbonates will effervesce (release bubbles of carbon dioxide gas) which is a characteristic reaction for identifying carbonate minerals.
What is the reaction between bleach and potassium iodide?
When bleach is mixed with potassium iodide, it undergoes a redox reaction. The bleach oxidizes the iodide ions to produce iodine, which can be observed as a brown color. This reaction can be used to test for the presence of bleach in a solution.
What happens to the surface of a mineral if the acid test is positive?
If the acid test is positive for a mineral, the surface of the mineral may show signs of fizzing or bubbling due to a chemical reaction between the acid and the mineral. This reaction indicates that the mineral contains carbonate minerals like calcite or dolomite, which are reactive to acid.
What is the name of the amino acid responsible for Hopkins-cole reaction test what is the formula of this amino acid?
The amino acid responsible for the Hopkins-Cole reaction test is tryptophan. Its formula is C11H12N2O2.
What chemical grouping is responsible for a positive Hopkins-Cole test?
Tryptophan
Will tyrosine test positive in Hopkins-Cole test?
Yes, tyrosine will test positive in the Hopkins-Cole test. This test is used to detect the presence of phenylketonuria (PKU) by identifying the abnormal accumulation of phenylalanine and tyrosine in the blood.
What is the Hopkins Cole test?
The hopkins-cole test is used to determine the presence of the amino acid tryptophan. Tryptophan has an indole nucleus which is responsible for the violet ring found at the junction between the two layers.
What is the Hopkins-Cole test?
The hopkins-cole test is used to determine the presence of the amino acid tryptophan. Tryptophan has an indole nucleus which is responsible for the violet ring found at the junction between the two layers.
What is color of Hopkins-cole test?
The Hopkins-Cole test is a test for detecting the presence of reducing sugars, such as glucose, in a sample. The color change observed in the test varies depending on the specific reagents used, but it typically involves a color change from blue to green or yellow in the presence of reducing sugars.
What is Hopkins's test?
The hopkins-cole test is used to determine the presence of the amino acid tryptophan. Tryptophan has an indole nucleus which is responsible for the violet ring found at the junction between the two layers.
What is the role of concentrated H2SO4 in Hopkins-cole test?
Concentrated H2SO4 is used in the Hopkins-Cole test to dehydrate the carbohydrates present in the sample, converting them into furfural derivatives. These derivatives then react with aniline to produce a colored product, allowing for the detection of the presence of pentoses and hexoses in the sample.
What is the role concentrated h2SO4 in the hopkins-Cole test?
Concentrated H2SO4 is used in the Hopkins-Cole test to dehydrate carbohydrates present in the sample, forming furfural derivatives that react with the reagent to produce a color change. This color change is then used to detect the presence of pentoses, specifically ribose and deoxyribose sugars.
What is the positive result in the hopkin's- cole test for proteins?
a purple /violet ring is formed at the junction .. that's what i get in our experiment.. and its correct..:)
Hopkins cole reagent?
3.0 g Mg powder or thin ribbon cut in small pieces, cover with distilled water and cool in an ice bath. Slowly add with stirring 75 mL cold, saturated oxalic acid solution (about 8 g oxalic acid in 75 mL water). Filter, and 7.5 mL glacial acetic acid to the filtrate. Top up to 150 mL with distilled water.
What has the author Roy Sinclair Hopkins written?
Roy Sinclair Hopkins has written: 'Novel composite membrane, test rig, and membrane applications'
