1. Two compounds have the same Rf (0.87) under identical conditions. Does this show that they...
1. Two compounds have the same Rf (0.87) under identical conditions. Does this show that
they have identical structures? Why or why not? If not, what additional experiments would
you perform?
2.
Why can there be no breaks in the thin-layer surface of a TLC
plate?
5. Write out the reaction between an organometallic reagent and acetone and use that to
explain why these reactions must be kept dry (H20) and free of acetone.
Homework Answers
Add Answer to:
1.
Two compounds have the same Rf
(0.87)
under identical conditions. Does this show that
they...
6.) a. Two compounds have the same Rf (0.74) under identical conditions. Does it mean that...
6.)
a. Two compounds have the same Rf (0.74) under
identical conditions. Does it mean that they have identical
structures? Explain.
b. On the basis of chemical structures, briefly explain why
xanthophylls are more polar than carotenes, and chlorophylls more
polar than pheophytins.
c. Which compounds do you expect would have a larger
Rf value, carotenes or xanthophylls?
d. Arange the following compunds in order of increasing
polarity: lutein, neoxanthin,
-carotene, violaxanthin?
e. Do you think that the hexanes extract...
1. If two spots have identical Rf values, does that mean that they are the same...
1. If two spots have identical Rf values, does that mean that they are the same identical molecules? Explain why or why not. 2. What value is there in using at least two different solvent systems? How might this be related to question 1. 3. Do some research, and briefly describe the roles of each pigment group in a leaf. Chlorophylls, Carotenes and Anthrocyanins. If the exact function isn’t know, list several of the possibilities.
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium bromide, a Grignard reagent, and react it with benzophenone to give triphenylmethanol. Grignard reagents are very reactive and must be synthesized in an environment free of water or any other source of potential proton donor. Once made, the Grignard reagent will do a nucleophilic attack on the carbonyl carbon of the ketone, benzophenone. The result is an alkoxide that is then protonated to give...
Attached is the lab experiment. Here are the questions I need help with: 1. What is...
Attached is the lab experiment. Here are the questions I need
help with:
1. What is the purpose of each of the following steps in this
experiment?
a. Adding solid NaCl to the reaction mixture
b. Repeated washings with water, sat'd NAHCO3, and brine
c. the pipet column chromatography
2. Which compound, cyclohexanol or cyclohexanone will have a
higher Rf on a TLC plate?
3. What is the advantage of using sodium hypochlorite as an
oxidant over CrO3 or Na2Cr2O7...
using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and...
using pictures and a maximum of 10 words, explain why an oven-dried
5-ml conical vial and drying tube(step 1 and 2 of part 1) are used
in the reaction. do both please! also the notebook pages are the
procedure
(1) Using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and drying tube (step 1 and 2 of Part 1) are used in the reaction. (2) After the addition of benzophenone to the mixture of...
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepa...
i need help with the postlab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
Experiment Write Up Proposal You will write up a synthesis procedure for one reaction that could...
Experiment Write Up Proposal You will write up a synthesis procedure for one reaction that could be potentially run in a face- to-face Chem 2321 lab session. Your proposal will include an introduction and procedure. The procedure will include step-by-step instructions for running the reaction (including reaction monitoring), work-up. (product isolation and purification), and analysis (characterization). You will need to include sample calculations for percent yield and provide sample spectra analysis. You must upload your proposal as a single document...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
6.)
a. Two compounds have the same Rf (0.74) under
identical conditions. Does it mean that they have identical
structures? Explain.
b. On the basis of chemical structures, briefly explain why
xanthophylls are more polar than carotenes, and chlorophylls more
polar than pheophytins.
c. Which compounds do you expect would have a larger
Rf value, carotenes or xanthophylls?
d. Arange the following compunds in order of increasing
polarity: lutein, neoxanthin,
-carotene, violaxanthin?
e. Do you think that the hexanes extract...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
Attached is the lab experiment. Here are the questions I need
help with:
1. What is the purpose of each of the following steps in this
experiment?
a. Adding solid NaCl to the reaction mixture
b. Repeated washings with water, sat'd NAHCO3, and brine
c. the pipet column chromatography
2. Which compound, cyclohexanol or cyclohexanone will have a
higher Rf on a TLC plate?
3. What is the advantage of using sodium hypochlorite as an
oxidant over CrO3 or Na2Cr2O7...
using pictures and a maximum of 10 words, explain why an oven-dried
5-ml conical vial and drying tube(step 1 and 2 of part 1) are used
in the reaction. do both please! also the notebook pages are the
procedure
(1) Using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and drying tube (step 1 and 2 of Part 1) are used in the reaction. (2) After the addition of benzophenone to the mixture of...
i need help with the postlab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
Experiment Write Up Proposal You will write up a synthesis procedure for one reaction that could be potentially run in a face- to-face Chem 2321 lab session. Your proposal will include an introduction and procedure. The procedure will include step-by-step instructions for running the reaction (including reaction monitoring), work-up. (product isolation and purification), and analysis (characterization). You will need to include sample calculations for percent yield and provide sample spectra analysis. You must upload your proposal as a single document...
Most questions answered within 3 hours.
-
Why [M(CN)6] is not organometallic even it has metal
to carbon bond too
asked 57 seconds from now -
mstar electric has a bond issue outstanding that has a 20 year
life, a $1,000 par...
asked 6 minutes ago -
This is a Business Writing Question:
Common Types of Faulty Sentence Logic:
A. Mixed constructions
B....
asked 7 minutes ago -
Skinner asserts that science, and the common view of science, has
been tarnished. Explain his evidence...
asked 9 minutes ago -
Question 3 (1 point)
Fill in the blank. Speed Car Rental company found that the tire...
asked 10 minutes ago -
An short-seller in Tesla is worried the latest management
earnings forecast is too aggressive and the...
asked 10 minutes ago -
A grocery store's receipts show that Sunday customer purchases
have a skewed distribution with a mean...
asked 16 minutes ago -
A 0.035 mol sample of a weak acid, HA, is dissolved in 437 mL of
water...
asked 28 minutes ago -
a sample of Ar gas has a volume of 6.30 L with an unknown
pressure. the...
asked 28 minutes ago -
The
serum cholesterol levels of a population of kids follow a normal
distribution with mean 155...
asked 48 minutes ago -
han discusses the racist practice of badlands, a bar
in the Castro
district of San Francisco,...
asked 1 hour ago -
A sample of final exam scores is normally distributed with a
mean equal to 25 and...
asked 1 hour ago