Homework Answers
Solution :
Fluorene will elute first.
Explanation :
The silica is polar in nature, hence it interacts strongly with polar compounds than non-polar ones so will elute after non-polar compounds. The fluorene is a non-polar compound hence it weakly interacts with silica, hence elute first, while flurenone being a polar compound interacts strongly with silica and elulte last.
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5 The structures of fluorene and fluorenone are given below. When you elute the mixture of...
use abbreviation structures! 2. a) Although fluorenone is more polar than fluorenol, more specific interactions between...
use abbreviation structures!
2. a) Although fluorenone is more polar than fluorenol, more specific interactions between fluorenol and silica account for its slow migration in thin-layer chromatography. Below is a picture of the partial structure of silica. Using abbreviated structures for fluorenol and fluorenone, show the specific intermolecular interactions between these compounds and silica. Draw in extra silanol groups, as necessary. Use abbreviations such as R2CHOH and R2C-O. A good drawing will show at least two molecules of fluorenol [interacting...
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase?...
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase? 3. What is the purpose of the cotton (glass wool) in column chromatography? 4. What is the purpose of the sand? 5. Why is it important to prevent the column from drying? 6. What can happen if you disrupt your even layer of silica gel? 7. Which compounds come off the column first, polar or nonpolar? 8. Keyon synthesized acetylferrocene (orange) in organic chemistry...
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...
Chromatography I Questions Name CHE 201 Date The following solvent systems were found to separate compounds...
Chromatography I Questions Name CHE 201 Date The following solvent systems were found to separate compounds A and B by column chromatography: • A: hexane/ethyl acetate 10:1 • B: hexane/ethyl acetate 10:5 Which is the more polar compound, A or B? Explain your answer for credit, 2) In order to separate a mixture of A and B as in problem (1) by column chromatography: a. Which solvent system must be used first? Why? b. Which compound will elute from the...
d) Draw the structure of the most polar compound and draw an arrow (through the structure)...
d) Draw the structure of the most polar compound and draw an arrow (through the structure) representing the overall/net dipole moment of the compound. 3) Suppose that your TLC showed that the compounds had not travelled away from your loading spot. What would be an easy condition to change to make the compounds travel up the TLC plate)? Briefly, state specifically what new condition might you try! (0.5) New conditions you could try is dotting more in the same spot,...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using silica gel plates. (2pts each) oso ooo a OH a) What would be a reasonable eluent that could be used to separate all three components on the TLC plate? Explain your reasoning. b) List the order of elution when using your proposed eluent. Explain your reasoning using complete sentences. c) What will be the effect on separation if you increase the polarity of your...
4. You plan to separate a mixture of the two compounds below using a column chromatography...
4. You plan to separate a mixture of the two compounds below using a column chromatography normal conditions, which of the compounds would you expect to be eluted off the column first? Expla
need only part a and C. please and thank you 6. Suppose you have a mixture...
need only part a and C. please and thank you
6. Suppose you have a mixture of five proteins listed in the table below: Protein pl Mol. Welght, kDa Homer 4.6 69 Liza 10.7 13 Marge Maggie Bart 5 40 6.4 8.5 7 27 Indicate the order in which the proteins elute from a Bio-Gel p-10 gel-filtration column (starting with the on that elutes first). Is this the best resin to separate all the components of this mixture? Why? If...
Hi can someone help me with my pre lab theory questions (1,2,3) on rate of elution...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Acidic compound: Ethyl 4 aminobenzoate Neutral compound: Fluorenone (12 points). Separation Scheme:_(5 points for the aqueous...
Acidic compound: Ethyl 4 aminobenzoate
Neutral compound: Fluorenone
(12 points). Separation Scheme:_(5 points for the aqueous extract or layer and 7 points for the organic extract or layer). By drawing the actual structures of the neutral compound that you have identified and either the acidic or basic compound or impurity present in your mixture, write a separation scheme for this binary mixture. Draw the appropriate complete structures with the correnct number of unshared electrons and/ or charges if any during...
use abbreviation structures!
2. a) Although fluorenone is more polar than fluorenol, more specific interactions between fluorenol and silica account for its slow migration in thin-layer chromatography. Below is a picture of the partial structure of silica. Using abbreviated structures for fluorenol and fluorenone, show the specific intermolecular interactions between these compounds and silica. Draw in extra silanol groups, as necessary. Use abbreviations such as R2CHOH and R2C-O. A good drawing will show at least two molecules of fluorenol [interacting...
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase? 3. What is the purpose of the cotton (glass wool) in column chromatography? 4. What is the purpose of the sand? 5. Why is it important to prevent the column from drying? 6. What can happen if you disrupt your even layer of silica gel? 7. Which compounds come off the column first, polar or nonpolar? 8. Keyon synthesized acetylferrocene (orange) in organic chemistry...
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...
Chromatography I Questions Name CHE 201 Date The following solvent systems were found to separate compounds A and B by column chromatography: • A: hexane/ethyl acetate 10:1 • B: hexane/ethyl acetate 10:5 Which is the more polar compound, A or B? Explain your answer for credit, 2) In order to separate a mixture of A and B as in problem (1) by column chromatography: a. Which solvent system must be used first? Why? b. Which compound will elute from the...
d) Draw the structure of the most polar compound and draw an arrow (through the structure) representing the overall/net dipole moment of the compound. 3) Suppose that your TLC showed that the compounds had not travelled away from your loading spot. What would be an easy condition to change to make the compounds travel up the TLC plate)? Briefly, state specifically what new condition might you try! (0.5) New conditions you could try is dotting more in the same spot,...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using silica gel plates. (2pts each) oso ooo a OH a) What would be a reasonable eluent that could be used to separate all three components on the TLC plate? Explain your reasoning. b) List the order of elution when using your proposed eluent. Explain your reasoning using complete sentences. c) What will be the effect on separation if you increase the polarity of your...
4. You plan to separate a mixture of the two compounds below using a column chromatography normal conditions, which of the compounds would you expect to be eluted off the column first? Expla
need only part a and C. please and thank you
6. Suppose you have a mixture of five proteins listed in the table below: Protein pl Mol. Welght, kDa Homer 4.6 69 Liza 10.7 13 Marge Maggie Bart 5 40 6.4 8.5 7 27 Indicate the order in which the proteins elute from a Bio-Gel p-10 gel-filtration column (starting with the on that elutes first). Is this the best resin to separate all the components of this mixture? Why? If...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Acidic compound: Ethyl 4 aminobenzoate
Neutral compound: Fluorenone
(12 points). Separation Scheme:_(5 points for the aqueous extract or layer and 7 points for the organic extract or layer). By drawing the actual structures of the neutral compound that you have identified and either the acidic or basic compound or impurity present in your mixture, write a separation scheme for this binary mixture. Draw the appropriate complete structures with the correnct number of unshared electrons and/ or charges if any during...
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