2. A student spots a mixture of the following compounds on a TLC plate and uses a 50:50 mixture of hexanes: ethyl acetate as the development solvent. Which compound is expected to have a larger Rf value? HO and A Not enough information given to answer the question. Their structures are too similar to separate by TLC. В A

2. A student spots a mixture of the following compounds on a TLC plate and uses a 50:50 mixture of hexanes: ethyl acetate as the development solvent. Which compound is expected to have a larger Rf value? HO and A Not enough information given to answer the question. Their structures are too similar to separate by TLC. В A

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Similar questions

If I want to detect chlorine-carbon and water in uv-vis spectrophotometer what solvent should I use ?
6. Which molecule will have a larger R, on a SiO₂ TLC plate using 10% Ethyl acetate/hexane as eluent? Draw their structures and explain why. Benzoic acid or ethyl benzene?
what is the elution for the following compounds on the same tlc plate. Indicate which is eluted from the highest Rf to the lowest Rf
If you ran an unknown sample on a TLC using 3-Methyl-Pentane as eluent and observed only one spot with a Rf value -0.05, is it safe to assume that it is a pure compound? If not, how can you check it out using TLC?
5. Properties and IMF: Chlorophyll a and Chlorophyll b are almost identical in structure, but they separated during TLC. Report the RFs you recorded for both molecules. What functional group(s) are different between them? Then explain these RF values by comparing the IMF present in each molecule to those present in the mobile or stationary phase and how this shaped their affinities for each phase. Use the terms RF, IMF, polar, nonpolar, affinity, mobile phase and stationary phase.
What is the purpose of chemically staining a TLC plate using iodine vapor? To increase the Rf values of all compounds on the plate To decrease the Rf values of all compounds on the plate To visualize colorless compounds that react with iodine on the plate To spread out the Rf values of all compounds on the plate more
Analyze the following GCMS spectra. In your analysis of each GC-MS spectrum, include: a) The structure of the compound b) The molecular ion (M*) and its corresponding m/z value (if shown in the spectrum) c) The base peak and its corresponding m/z value d) Provide the fragmentation pattern of the molecule. Be sure to clearly indicate the cations and/or radical fragments and their corresponding m/z value from the spectrum. Compound Name: 2-Hexanone 120 43 100 80 57 20 100 85 27 29 71 59 49 50 51 52 53 s4 5 101 0 31 160 62 63 65 67 69 83 14 10 20 30 40 50 60 70 80 90 100 m/z Relative Intensity
1. a)( b) ) List three factors that determine the rate at which compounds travel through a GC. In a TLC analysis, a student finds that all his spots have an R value less than 0.1. What should the student do to achieve a better separation?
13C NMR is less sensitive than 'H NMR because of the greater mass of carbon. True False
2) Consider the following compounds. Which rankings list these compounds in terms of Rf from lowest to highest using a silica gel thin layer chromatography plate and 1:1 Ethyl Acetate:Hexanes as the developing solvent. (e. g. A
True or False: Rf values can be used to identify pure compounds, provided that the analysis of the unknown is run simultaneously with the known compound in the same TLC plate.
The TLC plate shown was run in 80:20 Petroleum Ether - Ethyl acetate. If the eluent is changed to 95:5 Petroleum Ether - Ethyl Acetate, what will happen to the R-values? All Rf values will decrease All Rf values will increase Some Rf values will increase Some Rf values will decrease