When it comes to column chromatography, What is the purpose of irradiating azobenzene? Why does the...
When it comes to column chromatography,
What is the purpose of irradiating azobenzene?
Why does the cis-azobenzene move through the column more slowly than the trans-azobenzene?
Homework Answers
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When it comes to column chromatography,
What is the purpose of irradiating azobenzene?
Why does the...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is based on analytes being partitioned between a stationary phase (not moving) and a mobile phase (moving). What is most commonly used as stationary phase in a column? Is this material polar or non-polar? In this experiment, you will use different solvents to run column chromatography separation of different pigments extracted from spinach leaves. These solvents are a mixture of acetone and hexanes. (a) What...
In Organic lab we are enabling trans to cis isomerizaton of E-1,2-dibenzoylethylene by irradiating the alkene...
In Organic lab we are enabling trans to cis isomerizaton of E-1,2-dibenzoylethylene by irradiating the alkene with UV light. What is the overall equation for this reaction? And which is more polar the trans or the cis? Why?
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...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC and TLC operations conducted concurrently? Explain. 3. Name a few packing materials used in packing columns in Column Chromatography operations. 4. Explain the role of eluting solvent(s) in column chromatography procedures. 5. When performing column chromatography, which of the following compounds would you expect to elute first: Ferrocene of acetylferrocene? Explain why.
In general, what is the correct order of solvents when using Column Chromatography?
In general, what is the correct order of solvents when using Column Chromatography?
I am confused with gas chromatography. The question I am being asked is why did we...
I am confused with gas chromatography. The question I am being asked is why did we use column B (silicone oil) for separating 1-butene, trans-2-butene, and cis-2-butene from each other in a GC. I have answered all the other questions but I'm completely stuck on this one; can anyone help please?
Question 1: (column chromatography) a. What effect on the chromatographic separation is expected ...
Question 1: (column chromatography) a. What effect on the chromatographic separation is expected if solvent level is below the adsorbent? b. Once the chromatographic column was prepared, why was it important to allow the level of the liquid in the column to drop to the level of the stationary phase before applying the solution of the compounds to be separated? c. Name two methods of carrying out the column chromatography technique? d. What are the two methods of packing a...
Generally, what is the ideal Rf value of the analyte when using TLC to choose a solvent for column chromatography?
Generally, what is the ideal Rf value of the analyte when using TLC to choose a solvent for column chromatography?
A solvent passes through a chromatography column in 3.41 min, but the solute requires 9.13 min. What is the retenti...
A solvent passes through a chromatography column in 3.41 min, but the solute requires 9.13 min. What is the retention factor, k? k= What fraction of the time does the solute spend in the mobile phase in the column? fraction in mobile phase The volume of the stationary phase is 0.101 times the volume of the mobile phase in the column (V = 0.101V.). What is the partition coefficient, K, for this system?
When you push a door closer to the hinges, why does it open more slowly? because...
When you push a door closer to the hinges, why does it open more slowly? because you are closer to the center Now choose from one of the following options Why? a) It opens slowly, because the lever arm is shorter so the torque is large b) It opens slowly because the lever am is longer so the torque is large. c It opens slowly, because the lever asi is shorter so the torque is less. Comes from 9.2 The...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is based on analytes being partitioned between a stationary phase (not moving) and a mobile phase (moving). What is most commonly used as stationary phase in a column? Is this material polar or non-polar? In this experiment, you will use different solvents to run column chromatography separation of different pigments extracted from spinach leaves. These solvents are a mixture of acetone and hexanes. (a) What...
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...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC and TLC operations conducted concurrently? Explain. 3. Name a few packing materials used in packing columns in Column Chromatography operations. 4. Explain the role of eluting solvent(s) in column chromatography procedures. 5. When performing column chromatography, which of the following compounds would you expect to elute first: Ferrocene of acetylferrocene? Explain why.
In general, what is the correct order of solvents when using Column Chromatography?
A solvent passes through a chromatography column in 3.41 min, but the solute requires 9.13 min. What is the retention factor, k? k= What fraction of the time does the solute spend in the mobile phase in the column? fraction in mobile phase The volume of the stationary phase is 0.101 times the volume of the mobile phase in the column (V = 0.101V.). What is the partition coefficient, K, for this system?
When you push a door closer to the hinges, why does it open more slowly? because you are closer to the center Now choose from one of the following options Why? a) It opens slowly, because the lever arm is shorter so the torque is large b) It opens slowly because the lever am is longer so the torque is large. c It opens slowly, because the lever asi is shorter so the torque is less. Comes from 9.2 The...
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