Q: what does having a DBE(double bond equivalent) of 6 indicate when working with spectroscopy graphs?
A: DBE or double bond equivalent or LU or level of unsaturation is the number of unsaturations present…
Q: Dyes in unknown mixture: Yellow Calculations for Rf values: 1. Blue no.2 2. Red no.3 3. Yellow no.5…
A: The components in the unknown mixture can be identified by comparing the Rf values and colors of its…
Q: absorbance of a sample is 0.521, what is its concentration?
A:
Q: Which of the following fragments in a mass spectrometry would be accelerated through the analyzer…
A: The structural aspect of a molecule can be well analysed by the use of mass spectrometry. By seeing…
Q: Explain how the DEPT spectrum can aid structure determination
A: DEPT is known as Distortionless Enhancement by Polarization Transfer is a modern NMR technique used…
Q: Write a short note on FAB'"mass spectrometry.
A: mass spectrometry
Q: b) CsH.Br 80 60 40 20 TRANSMITTANCE (%) 主
A: Different types of spectroscopy can be used to identify the structure of unknown compound. Some…
Q: Can a low-resolution mass spectrometer distinguish between C2H5+ and CHO+? a. Can a high-resolution…
A: The high-resolution mass spectrometry and the low-resolution mass spectrometry are the two important…
Q: how would the Rf values change if eluted with hexanes using an alumina TLC plate?
A: In chromatography, a stationary phase is a solid, or a liquid supported on a solid (e.g. silica) and…
Q: What is the Hrxn in kJ? what is the Srxn in kJ?
A:
Q: Why were the absorbance measurements recorded at lambda max (504 nm)? Question 1 options:…
A: Most of the dyes are sensitive at 504 nm so at this wave length is fixed to measure the…
Q: Draw a figure to illustrate a SHAPE-probing experiment.
A: the shape is shown below.
Q: What is the molecular mass observed for Man9(GlcNAc)2 if it has a mass spectrometry ionization that…
A: In mass spectrometry, mass is represented as a bar graph, where each bar denotes the corresponding…
Q: What is difference between mass spectroscopy and mass spectrometry?
A: Spectroscopy refers to the study of how radiated energy and matter interact. The energy is absorbed…
Q: What
A: The ratio of the absorbance is used to determine the purity of the DNA . If the ratio is around 1.8…
Q: As part of an investigation on Pb in biological ecosystems, some grasses that grew along the road…
A:
Q: Shich will have no effect on an Rf value in TCL?
A: We have to tell which option is correct from given choices of options
Q: Better resolution" means... a) detected peaks are separated from each other as much as possible and…
A: Resolution is the ability to separate two peaks in chromatography. The higher the resolution, more…
Q: What is the base beak in an electron impact mass spectrum? Name one property of the positive…
A: Mass spectrometry is a technique for analysis of a substance in which molecules of substance ionised…
Q: Which kind of solvents are suitable for experiments involving spectroscopic analyses? (A…
A: In Spectroscopy, solvents play crucial role. In this technique ,solvents have to be 100 % pure,and…
Q: Why does a sample get wet during sublimation? With drying the NMR sample with Na2SO4.
A: Na2so4 exist as hydrate of sodium sulphate and it is highly hygroscopic in nature. That is why when…
Q: The figure below is a mass spectrum in ESI- MS. Calculate the MW of the protein analyzed from the…
A: The figure is given as the mass spectrum in ESI-MS. The MW of the protein has to be calculted.
Q: Give an advantage and a disadvantage of the spectra obtained from an electron impact (El) mass…
A: Answer :
Q: You did not wipe their fingerprints from the sides of the cuvette before making the absorbance…
A: If we do not wipe the fingerprint from the sides of the cuvette before making the absorbance…
Q: Draw structures for the two fragment ions of highest mass from the following molecule. ball & stick…
A: The mass spectrometry helps us to find the rough structure of the unknown compound from the m/z…
Q: please help me analyze the mass spectrometry
A: Please find your solution below : Mass spectrometry is a technique which is used to measure mass to…
Q: Match the Spectroscopy method to the information it provides. Infrared (IR) Spectroscopy [ Choose ]…
A: We have to match the spectroscopy with that of which they depends on . The Infrared spectroscopy are…
Q: Q.1. Explain why, even though the average atomic mass of silver is 107.9amu, no peak at 108 amu is…
A: Mass spectroscopy is an analytical technique used to determine the mass of compounds. This technique…
Q: What mass range or molecular mass range can be detected using GC-MS?
A: Mass spectrometry (MS) is an incredibly versatile technique, so it can be used on a wide range of…
Q: Please refer to the table below Name Chemical Formula Molecular Weight (CRC Handbook of Chemistry…
A: An unknown sample is run on a mass spectrometer and produced a mass spectrum with molecular ion, M+…
Q: Why do polar solvents obliterate the fine spectral structures in an absorption band?
A: Polar solvents obliterate the fine spectral structures in an absorption band.
Q: 1. What is mass spectrometry? What is the advantage of this technique in chemical analysis?
A:
Q: Choose the structure below that must have given rise to the FTIR scan pictured below. Note that this…
A: IR Spectroscopy is used to identify the functional groups present in an organic compound.
Q: Explain what can be determined from the following mass spectrum. M* = 123
A: From the mass spectrum we can determine the structure of unknown compound via molecular weight. It…
Q: How can IR spectroscopy be used to determine when the attached reaction is complete?
A: In the given reaction alkene is undergoing hydration to give alcohol. IR Spectroscopy is an…
Q: Why KBr used in IR spectroscopic sample preparation? Please shortly answer at your own words.…
A:
Q: How might you used mass spectrometry to distinguish between heptan-3-one and heptan-4-one? Justify…
A: Solution- by used mass spectrometry to distinguish between heptan-3-one and heptan-4-one-
Q: similarities and differences of the IR Reports. Include peaks and functional groups/ fingerprint…
A: By observing the given IR spectrum the following differences are identified: The broad peak at…
Q: Convert the 98% T to absorbance: а. О.008 b. 0.08 с. 0.021 d. 0.21
A: Transmittance = 98%
Q: a) How does mass spectrometry identify organic compounds?
A:
Q: Draw structures for the two fragment ions of highest mass from the following molecule. ball & stick…
A: The given molecule is:
Q: a) Calculate the rule of 13. b) Determine the molecular formula of the compound using the mass…
A: a). The rule of 13 means a base formula is made and the molecular mass is divided by 13. The number…
Q: Question 8. How can you use absorption spectra of dye standards to identify the dye(s) present in a…
A: Each and every dye has specific absorption maxima (λ max ). It is nothing but the wavelength at…
Q: Chemistry Name the compound using mass spec, NMR, and IR.
A: From the mass spectra, it is given that the mass of the unknown compound is 245.32 According to the…
Q: 31. How many percentage of the radical cation peak of (M +1) will be observed approximately when…
A: The relative natural abundance of M+1 that is 13C is 1.1% required the relative natural abundance of…
Q: Which of the following fragments produced in a mass spectrometer will be accelerated through the…
A: Fragments produced in mass spectrometer: All the positively charged fragments of the molecule are…
Q: Why Use Benchtop NMR Spectrometers?
A: Benchtop NMR spectrometers are portable ones which can be kept on the benchtop. It is also cost…
Q: In mass spectrometry, there are patterns in the molecular ion region due to isotopic abundances.…
A: The atoms with same atomic number but different mass number is known as isotopes. In mass…
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- What does a refractometer reading of 2 mean when distilling ethanol?A standard containing 20 mg/mL of compound P is placed in a 1 cm cuvette. The absorbance of the standard is 1.20 at 600 nm. A sample containing Compound P has an absorbance of 0.50. What is the concentration of this sample?Explain ICP-MS (Inductively Couple Plasma -Mass Spectrometry ES) method and how it work on minerals
- What is the importance of the following analytical methods in chemical analysis? i. UV-vis spectrophotometry ii. HPLC iii. GCChemistry Instrumental Analysis Class The experiment is OES: Cleaning Validation of removal of pharmaceutical drugs and calibration standards by fluoresence spectroscopy - Why the instrument use two detectors and monochromators? What type of monochromators are used in our instrument? - Do you think that a similar experiment can be prepared for the analysis of naproxen and benzoic acid? Explain.A. Copper sulfate pentahydrate is often used to teach students about Beer’s Law by making a standard curve (linear regression). The bright blue color of the solution has a peak absorbance in the red range of the electromagnetic spectrum. The absorbance value is proportional to concentration. How many grams of CuSO4 5H2O to make up 250 mL of a 0.2 M stock of this solution? B. Using M1V1 = M2V2 how many mL would a student need to measure out in graduated cylinder to make up a 50 mL (V2) solution of 0.1M, 0.05 M, 0.025M 0.0125M solutions for a standard curve at the peak wavelenth for this compound?
- A. Copper sulfate pentahydrate is often used to teach students about Beer’s Law by making a standard curve (linear regression). The bright blue color of the solution has a peak absorbance in the red range of the electromagnetic spectrum. The absorbance value is proportional to concentration. How many grams of CuSO4 5H2O to make up 250 mL of a 0.2 M stock of this solution? B. Using M1V1 = M2V2 how many mL would a student need to measure out in graduated cylinder to make up a 50 mL (V2) solution of 0.1M, 0.05 M, 0.025M 0.0125M solutions for a standard curve at the peak wavelenth for this compound? I need help with part B of this question.A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.144. Assuming that the best fit linear line of the standard curve was y=0.04144x+0.01521 (μgmL), calculate the percent protein by mass in the original protein powder.A student weighed out 0.150 g of protein powder and dissolved it in 100 mL of water (Solution 1). The student then diluted this solution by transferring 1 mL into a 25 mL flask and diluting with water (Solution 2). Finally, 1 mL of that solution was transferred to a test tube and combined with 4 mL Bradford reagent. The absorbance of the solution in the test tube was 0.11. Assuming that the best fit linear line of the standard curve was y = 0.04144 x + 0.01521 (μ g mL), calculate the percent protein by mass in the original protein powder.
- Choose the most accurate descriptions about quantitative analysis using atomic absorption spectrophotometer (AAS). A. The sample was digested with a concentrated acid, the digested solutions were diluted in 10x dilution factor and then was directly injected into AAS. B. AAS instrument can detect elements present only in solid samples C. Desolvation, vaporization, combustion, atomization, and ionization are the processes involved during sample analysis. D. Hollow cathode lamps (HCL) are energy sources that a cathode is made from a platinum element in a glass envelope of an inert filler gas. AAS is the most widely used instrumentation for the analysis of metal and traces metal samples. State one factor from the following is insignificant to AAS. A. Wide range sample analysis B. Effective C. Low cost D. RobustChoose the most accurate descriptions about quantitative analysis using atomic absorption spectrophotometer (AAS). A. The sample was digested with a concentrated acid, the digested solutions were diluted in 10x dilution factor and then was directly injected into AAS. B. AAS instrument can detect elements present only in solid samples C. Desolvation, vaporization, combustion, atomization, and ionization are the processes involved during sample analysis. D. Hollow cathode lamps (HCL) are energy sources that a cathode is made from a platinum element in a glass envelope of an inert filler gas.d. dipôle moments between atoms. The mass spectrum of CH3F is given in the chart below. (a) Draw a likely structure for the molecular ion (m/z 34). (b) Assign structural formulas to the two other high abundance peaks (m/z 33 and m/z 15) in the spectrum. (c) Propose an explanation for the low abundance of the peak at m/z 19. Relative lon Abundance 100 80 60 40 20 _________g 10 15 MW: (g/mol) C=12 H₂= 3 F: 19 20 25 miz 30 35