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Please answer question 12 ONLY. (Ignore question 11.)
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- Given your choice of Flame AA, ICP-AE, XRF, El-MS, or none of these, and keeping in mind that cost matters, which would you use a. for a nondestructive measurement of a sample? b. to determine 10ppm Zn in a solution? c. to determine the amount of Br in a mixture of KBr. KCL and KI? d. to determine the number of Bratoms in a molecule of an organic liquid? e. to determine 10ppb of Fe in motor oil?1. A two-component mixture is analyzed by paper TLC. Component A is more soluble in the mobile phase than component B. The following result is obtained. Calculate the Rifor each component and label the identity of each Frond (3-0,4)CM3D2.6cmr A (2-6-04 m = 2.2cm B C67-0.ycm=0.3cm RF (A= 2.2cm = 0.85 2. Lem spot. 2 39で Solvent Front A0-2.6m %3D 3cm Spoting Line Rf (8- 0.3cm 2. Scm = 0.12 %3D 2. Which one is the more polar component? Explain IS morC polo Because its Rf Is low 3. If a more polar solvent (mgbil phase) is used for the above experiment, the result will be: O Both component A and Component B will travel further up the plate-Distance may verur b) Only Component A will travel further up the plat c) Only Component B will travel further up the plat d) They will travel on the plate the same distance as when a less polar Choose one of the answers and explain 4. Paper chromatography works as the same principle as TLC however, cellulose paper (the same as filter paper) is used for…Ankita, well donel You explanation for how you figured out 10m was part of the GCF was very detailed. The next step of factoring out the GCF is where many students get stuck There is more than one way to show how we get from 200p m³ – 30p m + 40m to 10m (20p-3p +4)
- What does an IR spectrometer measure? What gives rise to the spectral features? Why is Tm (melting temperature) positive for some DSC plots and negative for others? What does it tell us about the type of polymer being analyzed?Explain why TLC cannot be used for some volatile low molecular weight substances such as toluene.12:15 9 & h b • 3r ill %19 Belge (1) - Kaydedildi İngilizce (ABD) dilindeki metin denetlenmiyor. .. A researcher prepared mixed solutions at different concentrations and measured the absorbances with the help of a spectrophotometer. In the spectrophotometer device, the distance between the cuvette and the light diffuser is 3 cm. The absorbance values of the mixture given in the table below. Mixture V (ml) %T Absorbans Concentrations (g/l) 5 37,55 0,444 0,21M 40,89 0,372 0,26M 3 44,97 0,311 0,35M 2 67,50 0,172 0,71M 1 82,65 0,084 0,97M a) Explain how to prepare 1N H2504 solution. b) Calculate the e values and the total absorbance for each volume value opposite. c) Explain the relationship between permeability and absorbance. KT A e A E E II ...
- HPLC VFA analysis - why do I get so different peaks for very similar samples?When Na is analyzed by flame atomic emission spectroscopy, what form of Na in the flame is being measured? a. Na (g) b. NaCkg) c Na*(g) d. Nalg) The efficiency of chromatograpnic separation increases with: 2 a. Increase the particle size b. Increasing plate height, H c. Increasing column length d. All answers Which of the following has the greatest solubility? a. Nis (Ksp = 5.6 x 10-16) %3D O b. Fe(OH)2 (Ksp = 2 x 10-15) %3D O c. Zn(OH)2 (Ksp = 4.5 x 10-17) %3D O d. AgBr (Ksp = 3.3 x 10-13)Explaining the following polymer size fractions in a polymer sample: Fraction Molecular Weight Number of Chains 1 3,250 400 5,000 500 3 500,000 4 а. Calculate the number-average molecular weight of the polymer. b. Calculate the weight-average molecular weight of the polymer. c. Which average molecular weight did the 4 chains of molecular weight of 500,000 most significantly affect? why ? d. Calculate the polydispersity index (PI = (Mw/Mn) of the polymer.
- 1a. Briefly explain 3 advantages and disadvantages of using ¹H-NMR for the quantitative analysis of organic compounds compared with HPLC-UV. 1b. Explain why an internal standard is needed in quantitative NMR and Indicate what information from the internal standard is required for quantitative analysis. 1c.Give 3 advantages and 3 disadvantages of GC-MS compared with GC-FID 1d . (Check the image below for q.1d)6. The UV-Vis absorption spectrum was measured for three different concentrations (10 mM, 20 mM, and 30 mM) of an analyte that we will call orangium as shown in the figure below. A 1.000 cm cuvette is used for all of the experiments. 1.00 0.90 0.80 0.70 0.60 a 0.5011. [15'] the molar absorptivity (extinction coefficient) of benzene (C6H6) equals 100 M-¹ cm¹ at 260 nm. (Assume that this number is independent of solvent or other effects) a) What concentration would give an absorbance of 1.0 in a 1 cm cell at 260 nm? b) If the density of pure, liquid benzene is 0.8 g cm²³, what 'thickness' of pure benzene would also give an absorbance of 1.0 at 260nm?SEE MORE QUESTIONS