Answered: Question 17 The flame-ionization…

Question 17 The flame-ionization detector is used in gas chromatography because the eluates cannot be detected by UV. True O False

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter33: High-performance Liquid Chromatography

Section: Chapter Questions

Problem 33.12QAP

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The flame-ionization detector is used in gas chromatography because the eluates cannot be detected by UV. True False
Question 21 For any chromatographic technique, tall and narrow peaks are preferred to short and broad peaks. True False
QUESTION T5 Why were the areas underneath the peaks in the gan chromatographs you eobtained mutiplied by a weight tactor? DA the corrction factor compensates for user error OB Rame lonization detectors (FID) respond slightly dfferent to compounds with diferent molecular weights OCnone of the answers OD. the GC (GOW MAC 350) used contains a quadrapole mass spec detector whose response must be corrected for the miz ratio of the diferent ions obtainen for diferert moleculestune OE not all molecules have the same themmal conductivity QUESTION 16 Which list of functional groups is present in the anti-viral drug Arbidol HO Br O A Thioether, alkene, ester, amide, amine O 8. Thioether alcohol, ester, amine OC Alcohol, ether, amide, epoxide, thioester OD. Ether, ketone olefin, amine, alcohol O E Thioalcohol, alkene, ether, amine, nitro
For any chromatographic technique, tall and narrow peaks are preferred to short and broad peaks. True False
Which of the following statements about a gas chromatogram is correct? O The height of the peak in the gas chromatogram is proportional to the amount of the compound present in the sample. Tailing indicates that the gas chromatograph has been overloaded. O If the peaks are broad this could indicate that the sample is too polar. O If the peaks overlap, the temperature can be increased at a slower rate to improve resolution. O The retention time can be used to identify a compound by comparison with literature values, regardless of the conditions used.
High performance liquid chromatography can separate eluates even if they are not present in the UV detector. True False
1) Study the chromatograph (below) of a mixture of Compounds A and B, run on the GCs in the teaching labs at CU Boulder. Compound A has the shorter retention time. STAAT 61 1.11 227 RT TYPE AREA XXXX XXXX XXXX AREAS 0.009 55874 44.117 ARIHT 0.61 XX XX XX 1.11 2.27 XX XX XX TOTAL AREA=XX MUL FACTOR=XX 1. What is the retention time of compound A? Compound B? 2. Which compound is present in a larger amount? 3. Which compound has the lower boiling point? 4. What would happen to the retention times of compounds A and B if the column temperature were raised? 5. You suspect that compound B is octane. What can you do to provide supporting evidence for this hypothesis?
When spiking a sample with isopentyl alcohol, the isopentyl alcohol peak should increase in area on the chromatogram. O 1) True O 2) False
Table 1: Chromatography Results Mobile Phase: Distilled Water Solvent front distance (cm): 8 cm M&M Candy Separated Spot Color Migration Distance (cm) (distance to center of spot from origin) Red M&M Red 7.5 cm Green M&M Yellow 5.3 cm Blue 7.7 cm Blue M&M Blue 7.8 cm -please help with this part Calculations/Results: Table 1: Results with Distilled Water M&M Candy Separated Spot Color Rf Value Red M&M Green M&M Blue M&M Rf = Distance traveled by component in a given time/ Distance traveled by solvent in same time Show work with units for one sample calculation.
Which Is The Most Commonly Used Detector In High Performance Liquid Chromatography And Why
Which one of the following techniques cannot be used to measure the amount of Ni in a sample? O gas chromatography visible light spectrometry voltammetry ICP-MS O atomic absorption spectrometry
Is there Br or Cl in this mass spectrometry?..