Homework Answers
Add Answer to:
paper chromatograpgy
3. If two samples have identical Rr values does this mean that they are...
paper chromatography T FOR EXPERIMENT 37 (continued) NAME QUESTIONS AND PROBLEMS 1. Why did you use...
paper chromatography
T FOR EXPERIMENT 37 (continued) NAME QUESTIONS AND PROBLEMS 1. Why did you use pencil to mark the paper and not a pen? 2. In each part, A and B, what was the mobile phase and what was the stationary phase? 3. If two samples have identical Re values does this mean that they are necessarily identi- cal molecules? Explain.
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.
Why did you use a pencil to mark the paper and not a pen? 1. 2....
Why did you use a pencil to mark the paper and not a pen? 1. 2. Why do you have to use a different capillary tube for each sample? Why is it very important in the amino acid chromatogram not to touch the paper with your fingers or hands? 3. 4. If two samples have identical R values does this mean that they are necessarily identical molecules? Explain What is your unknown? How do you know?
What does it generally mean when you have a RR=1, RR<1or a RR>1 • If you...
What does it generally mean when you have a RR=1, RR<1or a RR>1 • If you are confused look at the hormone replacement therapy abstracts. What did Grodstein et al. conclude and was their RR equal to, less than or greater than 1? What did the Women’s Health Initiative (WHI) study find? What did their respective RR represent? (We will cover these studies on 9/17 and 9/19 but the RR is from the epidemiology section) Who is the unit of...
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...
22.39 Order in choice. Does the order in which wine is pre 4st p sented make a dlifference! Sever...
22.39 Order in choice. Does the order in which wine is pre 4st p sented make a dlifference! Several choices of wine are pre- sented one at a time and in sequence, and the subject is then asked to choose the preferred wine at the end ot the sequence. In this study, subjects were asked to taste two wine samples in sequence. Both samples given to a subject were the same wine, although subjects were expecting to taste two different...
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...
In complete sentences on the back of this page or on a separate piece of paper...
In complete sentences on the back of this page or on a separate piece of paper answer the following questions. (5 pts each) 1. Choose any two known amino acids with similar R and based on the size and polarity of their side chains, give an explanation for why their retention factors are similar. 2. Choose any two known amino acids with very different Rr values and based on the size and polarity of their side chains, give an explanation...
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.
If two distantly related organisms have regions of conserved synteny, what does this mean? If two...
If two distantly related organisms have regions of conserved
synteny, what does this mean?
If two distantly related organisms have regions of conserved synteny, what does this mean? Choose one: O A. The genes examined in the two species are present in the same order as in their most recent common ancestor. O B. The genes examined in the two species are nonhomologous to each other. O C. The genes examined in the two species are under the control of...
paper chromatography
T FOR EXPERIMENT 37 (continued) NAME QUESTIONS AND PROBLEMS 1. Why did you use pencil to mark the paper and not a pen? 2. In each part, A and B, what was the mobile phase and what was the stationary phase? 3. If two samples have identical Re values does this mean that they are necessarily identi- cal molecules? Explain.
Why did you use a pencil to mark the paper and not a pen? 1. 2. Why do you have to use a different capillary tube for each sample? Why is it very important in the amino acid chromatogram not to touch the paper with your fingers or hands? 3. 4. If two samples have identical R values does this mean that they are necessarily identical molecules? Explain What is your unknown? How do you know?
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...
22.39 Order in choice. Does the order in which wine is pre 4st p sented make a dlifference! Several choices of wine are pre- sented one at a time and in sequence, and the subject is then asked to choose the preferred wine at the end ot the sequence. In this study, subjects were asked to taste two wine samples in sequence. Both samples given to a subject were the same wine, although subjects were expecting to taste two different...
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...
In complete sentences on the back of this page or on a separate piece of paper answer the following questions. (5 pts each) 1. Choose any two known amino acids with similar R and based on the size and polarity of their side chains, give an explanation for why their retention factors are similar. 2. Choose any two known amino acids with very different Rr values and based on the size and polarity of their side chains, give an explanation...
If two distantly related organisms have regions of conserved
synteny, what does this mean?
If two distantly related organisms have regions of conserved synteny, what does this mean? Choose one: O A. The genes examined in the two species are present in the same order as in their most recent common ancestor. O B. The genes examined in the two species are nonhomologous to each other. O C. The genes examined in the two species are under the control of...
Most questions answered within 3 hours.
-
Computer Programming II CS141(Java)
Mention the appropriate relationship between following
classes:
HOD–StaffMember
Car–Ferrari
Student-Address
BankAccount–FixedAccount
House-Building...
asked 2 minutes ago -
Assume one of your finals has 50 questions on it, and
lucky for you, it's all...
asked 1 hour ago -
Rice Products in Bangladesh
Business behavior is derived in large part from the basic cultural
environment...
asked 2 hours ago -
The following base sequence is found for a mRNA fragment from
wild-type E. coli: 5'- UAUCAGUAGAUAAUGUAACC-3'...
asked 3 hours ago -
For this exercise, round all regression parameters to three
decimal places.
One of the two tables...
asked 3 hours ago -
What is the 5% level of significance for mean = 3.60, standard
deviation = 0.94, and...
asked 3 hours ago -
Prior to beginning work on this discussion, please read the
article by Hayley Peterson, 15 Companies...
asked 3 hours ago -
Which pair of aqueous solutions, when mixed, will form a
precipitate?
A) NaNO3 and AgC2H3O2
B)...
asked 4 hours ago -
1-Write an algorithm to get two numbers from the user (as
inputs) and calculate the sum...
asked 7 hours ago -
Define white-collar crime. What is the difference between
offender and offense-based definitions of white-collar crime? What...
asked 8 hours ago -
Consider a reaction which is 1st order with respect to A and 1st
order with respect...
asked 8 hours ago -
c++
The length of the hypotenuse of a right-angled triangle is the
square root of the...
asked 8 hours ago