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In a chemical reaction, compound A is converted to compound B. Compound A has an Rr...
3. A student is monitoring a reaction using TLC. The chemical reaction converts compound A into...
3. A student is monitoring a reaction using TLC. The chemical reaction converts compound A into compound B, and she uses molecule A as her reference. Compound A has an Rf value of 0.45; while compound B has an Rp of 0.68 in the solvent system being used. a. Draw a picture of her TLC plate at the beginning of the reaction. b. Draw a picture of her TLC plate after 50% completion (50% of the A molecules have been...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
1. You set up a chemical reaction with two materials, but only one of which shows...
1. You set up a chemical reaction with two materials, but only one of which shows up by TLC (Compound A, Rf = 0.75). Your product is supposed to have an Rf of 0.5 in the same eluent. Draw three TLC plates that you expect to see at these times: 1) at beginning of reaction, 2) halfway through reaction, 3) when reaction is done. Try to keep the TLC plates no more than 5cm in height, and just label the...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
3) Assume that you are given a mixture of compound A and compound B, and it...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
Could you describe the differences of the chemical structures and solubility as well as boiling points...
Could you describe the differences of the chemical structures
and solubility as well as boiling points and why each one came out
sooner than the next? Thank you
Problem 3. Explaining a GLC Elution Order (6p). Below is a table of physical data for isopropanol, ethyl acetate and propyl acetate. Problem 3 Physical Constants Table Chemical Name Chemical Formula Chemical Structure Molar Mass (g/mol) Boiling Point (*) Density (g/ml) OH Isopropanol CH 0 60.1 82.5 0.786 H3C CHE Ethyl acetate...
can you please answer all 1. When you run a TLC of the reaction in ethyl...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
Alkenes can be converted to alcohols by reaction with mercuric acetate to form a B-hydroxyalkylmercury(II) acetate...
Alkenes can be converted to alcohols by reaction with mercuric acetate to form a B-hydroxyalkylmercury(II) acetate compound, a reaction called oxymercuration. Subsequent reduction with NaBH4 reduces the C-Hg nd to a C-H bond, forming the alkyl alcohol, a reaction called demercuration. Draw the structure of the Hg-containing compound and the final alcohol product formed in the following reaction sequence. Neutral product of oxymercuration. Omit byproducts. HgOOCCH, H,O, THE Alcohol product of demercuration. Na BH HO
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
3. A student is monitoring a reaction using TLC. The chemical reaction converts compound A into compound B, and she uses molecule A as her reference. Compound A has an Rf value of 0.45; while compound B has an Rp of 0.68 in the solvent system being used. a. Draw a picture of her TLC plate at the beginning of the reaction. b. Draw a picture of her TLC plate after 50% completion (50% of the A molecules have been...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
Could you describe the differences of the chemical structures
and solubility as well as boiling points and why each one came out
sooner than the next? Thank you
Problem 3. Explaining a GLC Elution Order (6p). Below is a table of physical data for isopropanol, ethyl acetate and propyl acetate. Problem 3 Physical Constants Table Chemical Name Chemical Formula Chemical Structure Molar Mass (g/mol) Boiling Point (*) Density (g/ml) OH Isopropanol CH 0 60.1 82.5 0.786 H3C CHE Ethyl acetate...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
Alkenes can be converted to alcohols by reaction with mercuric acetate to form a B-hydroxyalkylmercury(II) acetate compound, a reaction called oxymercuration. Subsequent reduction with NaBH4 reduces the C-Hg nd to a C-H bond, forming the alkyl alcohol, a reaction called demercuration. Draw the structure of the Hg-containing compound and the final alcohol product formed in the following reaction sequence. Neutral product of oxymercuration. Omit byproducts. HgOOCCH, H,O, THE Alcohol product of demercuration. Na BH HO
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
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