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When observing the TLC plates, were all the spots nice small circles? If no, provide and...
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....
Please help?!?! When ACE. ASP and CAF were analyzed by TLC using 2:9:9 mixture of t-butyl...
Please help?!?!
When ACE. ASP and CAF were analyzed by TLC using 2:9:9 mixture of t-butyl alcohol. 4-methyl-2-pentanone and ethyl acetate respectively the following R_f values were obtained: ACE (0.51), ASP (0.15) and CAF (0.35). These results are not the same ones obtained when using 2percentage acetic acid and 98percentage ethyl acetate as the mobile phase? Explain why were the results different for our case (TLC shown) particularly for caffeine. Give the R_f values you obtained in lab for the...
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...
Please complete the calculations and show all steps. ic at the niseet When the small circles...
Please complete the calculations and show all steps.
ic at the niseet When the small circles on each cursor line overlap each eht tu ie potht Where inction, the temperatures shown in either examine box should be equal to the intersect DATA AND CALCULATIONS Mass of lauric acid Mass of benzoic acid Freezing temperature of pure lauric acid Freezing point of the benzoic acid-lauric acid mixture Freezing temperature depression, At 43.0 sq.5 oC °C °C Molality, m molkg Moles of...
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) 9 10 8 7 LLLLLLL 6 5 4 001 2 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column /...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
please show explanation on all 4 Provide brief answers to the following questions. 1. The melting...
please show explanation on all 4
Provide brief answers to the following questions. 1. The melting points of MgO, 2800°C; Cao, 1728°C; Sro, 1635°C; BaO, 1475°C What is the reason behind this trend? 2. Write a balanced reaction for the following a. Silicon tetrachloride with water b. Titanium(IV)chloride with water 3. Write the formulas for the Period 4 main group metal fluorides. Identify the mostly likely type of bonding to occur in each case. 4. When methylammonium chloride is dissolved...
Please provide your response for the following questions. What types of plans and decisions most likely...
Please provide your response for the following questions. What types of plans and decisions most likely require board of director involvement, and why? What types of decisions and plans are not appropriate for board involvement, and why? Tell about a time when an organization was not able to fully achieve all of its goals simultaneously. Why did this occur? Is complete realization of all goals impossible for an organization? Why or why not? Describe the process that an...
1. (5 pt.) Soon you will synthesize the analgesic acetanilide in lab. It’s m.p. is 114C....
1. (5 pt.) Soon you will synthesize the analgesic acetanilide in lab. It’s m.p. is 114C. What does it indicate about your product if you obtain a m.p. of 103 - 112C. Explain. 2. (6 pt.) Neither aniline nor nitrobenzene is particularly water soluble. However, one is completely soluble in dilute aqueous HCl. Which one is soluble, and explain why? (For maximum credit, provide a chemical equation for your answer.) 3. (5 pt.) Name the two adsorbents that are most...
1. All students: (a) By combining kinetic theory with classical mechanics, Drude was able to derive...
1. All students: (a) By combining kinetic theory with classical mechanics, Drude was able to derive a sensible equation for the electrical conductivity of metals. In the case of the thermal conductivity however, Drude's theory fails. Explain why (in bullet-point form). (b) The Fermi energy of copper is ~8 eV. What fraction of electrons are above the Fermi-level at room temperature? (c) Write down a general expression for the electron density in terms of the density of states and the...
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....
Please help?!?!
When ACE. ASP and CAF were analyzed by TLC using 2:9:9 mixture of t-butyl alcohol. 4-methyl-2-pentanone and ethyl acetate respectively the following R_f values were obtained: ACE (0.51), ASP (0.15) and CAF (0.35). These results are not the same ones obtained when using 2percentage acetic acid and 98percentage ethyl acetate as the mobile phase? Explain why were the results different for our case (TLC shown) particularly for caffeine. Give the R_f values you obtained in lab for the...
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...
Please complete the calculations and show all steps.
ic at the niseet When the small circles on each cursor line overlap each eht tu ie potht Where inction, the temperatures shown in either examine box should be equal to the intersect DATA AND CALCULATIONS Mass of lauric acid Mass of benzoic acid Freezing temperature of pure lauric acid Freezing point of the benzoic acid-lauric acid mixture Freezing temperature depression, At 43.0 sq.5 oC °C °C Molality, m molkg Moles of...
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) 9 10 8 7 LLLLLLL 6 5 4 001 2 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
please show explanation on all 4
Provide brief answers to the following questions. 1. The melting points of MgO, 2800°C; Cao, 1728°C; Sro, 1635°C; BaO, 1475°C What is the reason behind this trend? 2. Write a balanced reaction for the following a. Silicon tetrachloride with water b. Titanium(IV)chloride with water 3. Write the formulas for the Period 4 main group metal fluorides. Identify the mostly likely type of bonding to occur in each case. 4. When methylammonium chloride is dissolved...
1. All students: (a) By combining kinetic theory with classical mechanics, Drude was able to derive a sensible equation for the electrical conductivity of metals. In the case of the thermal conductivity however, Drude's theory fails. Explain why (in bullet-point form). (b) The Fermi energy of copper is ~8 eV. What fraction of electrons are above the Fermi-level at room temperature? (c) Write down a general expression for the electron density in terms of the density of states and the...
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