4.a) Mention and describe the first method used for the synthesis of carbon nanotubes?(4)b) Numerous nanomaterials have been synthesized using Chemical Vapour Deposition(CVD) method. Mention five step mechanism that are involved in CVD process?(5)c) Describe and compare FTIR and Raman spectroscopyd) Discuss how the optical properties are measured using UV-VIS

(a) The arc-discharge method stands as one of the foundational techniques for the synthesis of…

Answered: 4. a) Mention and describe the first…

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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11. (8pts) how can silica gel F2s4 TLC plates can be visualized ( give two methods? :
3D2: Recognize and interpret four levels of 1H NMR data: H group signal symmetry, peak height, signal splitting, and chemical shift (8) in the determination of organic structure. (a) Complete the data table for the given 'H NMR spectrum. 1H NMR Spectrum 10 9 label a b с d 8 7 6 8 (ppm) 1 5 1H, t (b) Deduce a structure for a MF of C6H12Osthat fits the 'H NMR data set. I 4 6H, s 1 3 2H, di #H (peak height/integral) 3H, s 2 1 splitting TMS 4 0 8 (ppm)
Potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4) give overlapping UV-Vis absorption spectra in 1 M sulphuric acid. K2Cr2O7 shows an absorption maximum at 440 nm and KMnO4 shows the absorption maximum at 545 nm . An unknown sample solution containing a mixture of K2Cr2O7 and KMnO4 was analyzed using a 1-cm cell and the absorbance values at these two wavelengths were as follows: A440 = 0.515 and A545 = 0.835 The absorbance values for standard solutions of K2Cr2O7 (1.00 x 10-3 M) and KMnO4 (2.00 x 10-4 M) in 1 M sulphuric acid using the same 1 cm cell were as follows: Calculate the concentrations of K2Cr2O7 and KMnO4 in the unknown sample.
Explain and justify your answer
2. One of the common methods used to determine phosphorus in urine isto treat urine with molybdenum(VI) resulting in a complex compoundof 12- molybdophosphate and then reduced using ascorbic acid produces a blue-colored compound called molybdenum blue (max = 650 nm). A patient's urine sample collected over 24 hours produced 1122 mL of urine. A total of 1 mL of the sample was treated with Mo(VI) and ascorbic acid and diluted until it reached a volume of 50 mL. A calibration curve is also prepared by treating 1 mL of standard phosphate solution in the same way. The absorbance of the standard solution and the sample was then measured at a wavelength of 650 nm and produced the following data: Solution Absorbance at λ 650 nm Phosphate 1 ppm Phosphate 2 ppm Phosphate 3 ppm Phosphate 4 ppm Urine sample 0,230 0.436 0,638 0,848 0.518 a. Create a calibration curve for the data and determine the slope, intercept, and R values of 2! Determine the concentration of phosphates found in urine samples…
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1) Compare the techniques of open-path FTIR versus extractive FTIR using gas cells for the analysis of gaseous compounds. Contrast the difference in their instrumentation and analytical procedures and briefly state the analytical applications of each method 2) A Chromophore is___________ 3) The X-ray microanalysimicro analysis technique in a scanning electron microscope involves the transitions of___ 4) What are the radiation sources for Infrared and Near Infrared spectra 5) A typical source for Raman spectroscopy is________
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Graphite furnace atomizers are renowned in Atomic Absorption Spectrometry for their exceptionally low detection limits (10-12 g and lower for many elements). Why are detectabilities so much better with graphite furnaces than with flame atom cells in AAS?
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