predict witch will have the highest rf value and witch will have the lowest out of...
Homework Answers
Silica gel plaques for TLC represent a polar surface with which the analyzed compounds will interact. This polar phase will interact more effectively with polar molecules, which will therefore be more strongly retained when the mobile phase (in this case, toluene) advances through the silica plaque. As they are more strongly retained, they won't be able to advance with the solvent as much as molecules with lower polarity, which means that the higher the polarity of the molecule, the lower its advance (represented by Rf). Consequently, in our mixture, naphthalene will have the highest Rf, since it is the least polar molecule and butyric acid will have the lowest Rf, since it is the most polar one.
Add Answer to:
predict witch will have the highest rf value and witch will
have the lowest out of...
Which of the following compounds would you expect to have the lowest Rf value on a...
Which of the following compounds would you expect to have the lowest Rf value on a silica gel TLC plate developed with dichloromethane? O A. Naphthalene O B. Phenyl acetate OC Butyric acid QUESTION 3 Which of the following compounds would you expect to have the highest Rf value on a silica gel TLC plate developed with dichloromethane? O A 2-octanone O B. Acetic acid C. 1-butanol OD. decane E. acetaldehyde
Refer to the four compounds below for question 5-7: CH3 will have intermolecular hydrogen bonding. 5) 6) is the most nonpolar compound in the group. 7) will have the lowest Rf value on a silica-...
Refer to the four compounds below for question 5-7: CH3 will have intermolecular hydrogen bonding. 5) 6) is the most nonpolar compound in the group. 7) will have the lowest Rf value on a silica-gel TLC plate. 17) In the distillation setup shown, the water in the condenser (5) should flow 0 161 A) in through [7) and out through [9] C) in through [9] and out through [7] B) in through [61 and out through [7] D) it is...
Which compound is likely to have the highest Rf value on silica gel TLC? Group of...
Which compound is likely to have the highest Rf value on silica gel TLC? Group of answer choices A) Benzoic Acid B) Dimethylaniline C) Benzophenone D) They will all have the same Rf value.
slightly confused I thought thought Rf 0 was solid andRf1 is slightly liquid please any...
slightly confused I thought Rf 0 was solid and
Rf1 is slightly liquid please any help is greatly appreciated.3. Two extreme values for the Retention Factor are 0 and 1 a) Explain what each Re value means in terms of the substance's affinity for the mobile phase and for the stationary phase. b) Describe the features of molecules that would have these extreme Rr values under the conditions in this experiment: the solvent an 80:20 mix of petroleum ether and acetone, the...
Ok, so what would happen if you are working with TLC and have a polar stationary...
Ok, so what would happen if you are working with TLC and have a polar stationary phase (silica) and a mobile phase ( polar eluting solution) and you spot a nonpolar compound? Would the Rf values be greater than in a nonpolar mobile phase? I know in general if you are using TLC with polar silica and spot a nonpolar compound the nonpolar compound travels further (higher Rf values) because its chemical structure is different than the stationary phase compared...
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...
1. Rank the compounds in each group, groups l- IV, (1 - highest Rf value, 3-lowest...
1. Rank the compounds in each group, groups l- IV, (1 - highest Rf value, 3-lowest Rf value) on a TLC plate run using a 1:1 hexanes:ethyl acetate as an eluent. (3 pts) Group l: OH Group ll: HN HO Group IlI: NH2 NH2 NO2 NO2 Group IV: он
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you...
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
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...
Consider the following scenario: You have a mixture of phenol and anisol, your TLC is coated...
Consider the following scenario: You have a mixture of phenol and anisol, your TLC is coated with silica gel, and you will use ethyl acetate as your mobile phase. Which compound will travel a longer distance in the TLC plate? Explain your answer.
Which of the following compounds would you expect to have the lowest Rf value on a silica gel TLC plate developed with dichloromethane? O A. Naphthalene O B. Phenyl acetate OC Butyric acid QUESTION 3 Which of the following compounds would you expect to have the highest Rf value on a silica gel TLC plate developed with dichloromethane? O A 2-octanone O B. Acetic acid C. 1-butanol OD. decane E. acetaldehyde
Refer to the four compounds below for question 5-7: CH3 will have intermolecular hydrogen bonding. 5) 6) is the most nonpolar compound in the group. 7) will have the lowest Rf value on a silica-gel TLC plate. 17) In the distillation setup shown, the water in the condenser (5) should flow 0 161 A) in through [7) and out through [9] C) in through [9] and out through [7] B) in through [61 and out through [7] D) it is...
slightly confused I thought Rf 0 was solid and
Rf1 is slightly liquid please any help is greatly appreciated.3. Two extreme values for the Retention Factor are 0 and 1 a) Explain what each Re value means in terms of the substance's affinity for the mobile phase and for the stationary phase. b) Describe the features of molecules that would have these extreme Rr values under the conditions in this experiment: the solvent an 80:20 mix of petroleum ether and acetone, the...
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...
1. Rank the compounds in each group, groups l- IV, (1 - highest Rf value, 3-lowest Rf value) on a TLC plate run using a 1:1 hexanes:ethyl acetate as an eluent. (3 pts) Group l: OH Group ll: HN HO Group IlI: NH2 NH2 NO2 NO2 Group IV: он
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
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...
Most questions answered within 3 hours.
-
Question 5
What effect would a decrease in
temperature have on pressure, assuming that volume
(T)...
asked 1 minute from now -
Jor-el throws a ball upward from the top of a 728 foot building
on the planet...
asked 26 seconds ago -
Draw the Lewis dot structures for the following molecules. None
of the atoms have a formal...
asked 2 minutes ago -
What does it mean when an element is radioactive?
a.
It means the element is changing...
asked 3 minutes ago -
A company deposits $6,000 in a bank at the end of every year for
10 years....
asked 2 minutes ago -
What are some strategies for eliminating service barriers?
By using your knowledge of
behavioral styles, please...
asked 10 minutes ago -
What are the decimal numbers for 159, 150, 200, 113, 225, 87,
106, 81 when converted...
asked 18 minutes ago -
Calculate and plot the number and weight distributions of x-mers
found in a step-growth polymerization for...
asked 38 minutes ago -
The Baily Corporation has developed a specialized software
program that improves inventory control capability. The following...
asked 42 minutes ago -
Problem 5-4A (Part Level Submission) Wolford Department Store is
located in midtown Metropolis. During the past...
asked 42 minutes ago -
Preparation of Benzoic Acid using a Grignard Reagent URGENT
1. During your Grignard formation, a small...
asked 1 hour ago -
A uniform magnetic field is perpendicular to the plane of a wire
loop. If the loop...
asked 1 hour ago