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Question 18 (3 points) What is the Rf value for the TLC spot shown? The scale...
Determine the Rf value of the substances A, B, and C on the TLC shown. Show...
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
Please help 2. Consider the TLC plate shown below that was done on silica gel using...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front that travels 13 cm. 2) A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown material a pure compound? What can be done to verify the purity of the sample using thin-layer chromatography? 3) You try to synthesize n-hexyl bromide as a product...
Question 9 1 pts Considering the silica gel TLC plate shown, which compound is the most...
Question 9 1 pts Considering the silica gel TLC plate shown, which compound is the most polar (the solvent front is at 4.0 cm)? Spot Distance traveled (cm) A 0.50 В 2.0 IC 3.0 D 1.0 O Compound B (spot B) Compound A (spot A) O Compound D (spot D) O Compound C (spot C)
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf va...
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf value of 0.08 1 points A. Explain why this result does not guarantee that the sample is a pure compound. B. Suggest two changes that could be made to the experiment to improve the analysis of the unknown sample. 2 points Change 1 Change 2
Question 24 1 pts Suppose you run a TLC and observe an Rf value consistent with...
Question 24 1 pts Suppose you run a TLC and observe an Rf value consistent with the formation of the desired product. Next, you run a MP analysis and notice that a MP range is too large. Which of the following techniques would you implement? o use a smaller amount of product for MP analysis o use a larger amount of product for MP analysis O rerun the TLC and change the mobile phase used O recrystallize the product
6. Calculate the Rf value for these 3 compounds. (12 pts) 20 Solvent front 18 16...
6. Calculate the Rf value for these 3 compounds. (12 pts) 20 Solvent front 18 16 14 12 10 8 6 4 2 0 --------------------- Starting point А B с
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
D Question 14 3.5 ts What is the line of solvent that moves up the TLC...
D Question 14 3.5 ts What is the line of solvent that moves up the TLC plate referred to as? O Solvent front O Capillary front Resolving factor Chromatographic boundary Question 15 3.5 pts Most organic compouds are colorless or white. A UV lamp assists in seeing your separation on TLC plates by: Making the organic sample spots glow and leaving the stationary phase dark Making the stationary phase glow, leaving dark spots where your sample is located Showing how...
Question 18 4 pts Find the value of to such that the P(-to < t <...
Question 18 4 pts Find the value of to such that the P(-to < t < to) = .99 where df = 9. O 2.262 O 2.2821 O 1.833 0 3.250 < Previous Next →
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front that travels 13 cm. 2) A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown material a pure compound? What can be done to verify the purity of the sample using thin-layer chromatography? 3) You try to synthesize n-hexyl bromide as a product...
Question 9 1 pts Considering the silica gel TLC plate shown, which compound is the most polar (the solvent front is at 4.0 cm)? Spot Distance traveled (cm) A 0.50 В 2.0 IC 3.0 D 1.0 O Compound B (spot B) Compound A (spot A) O Compound D (spot D) O Compound C (spot C)
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf value of 0.08 1 points A. Explain why this result does not guarantee that the sample is a pure compound. B. Suggest two changes that could be made to the experiment to improve the analysis of the unknown sample. 2 points Change 1 Change 2
Question 24 1 pts Suppose you run a TLC and observe an Rf value consistent with the formation of the desired product. Next, you run a MP analysis and notice that a MP range is too large. Which of the following techniques would you implement? o use a smaller amount of product for MP analysis o use a larger amount of product for MP analysis O rerun the TLC and change the mobile phase used O recrystallize the product
6. Calculate the Rf value for these 3 compounds. (12 pts) 20 Solvent front 18 16 14 12 10 8 6 4 2 0 --------------------- Starting point А B с
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
D Question 14 3.5 ts What is the line of solvent that moves up the TLC plate referred to as? O Solvent front O Capillary front Resolving factor Chromatographic boundary Question 15 3.5 pts Most organic compouds are colorless or white. A UV lamp assists in seeing your separation on TLC plates by: Making the organic sample spots glow and leaving the stationary phase dark Making the stationary phase glow, leaving dark spots where your sample is located Showing how...
Question 18 4 pts Find the value of to such that the P(-to < t < to) = .99 where df = 9. O 2.262 O 2.2821 O 1.833 0 3.250 < Previous Next →
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