12. (a). In principle, a material sample can be analyzed to its functional group content using Raman spectroscopy and FTIR. explain the difference between the two methods, regarding: i. photon absorption or scattering ii. Dipole moment or polarizability (b). if the FTIR result of a sample as shown below, what can be discussed?
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12. (a). In principle, a material sample can be analyzed to its
i. photon absorption or scattering
ii. Dipole moment or polarizability
(b). if the FTIR result of a sample as shown below, what can be discussed?
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- 5. The following table lists molecular weight data for a polymer material. Polymer Sample # 1 2 3 4 5 6 7 8 9 10 MW of 204 216 240 243 280 282 291 320 325 480 sample Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization if the repeating unit have a molecular weight of 28g/mol (d) draw a polymer with 5 repeating units, based your monomer on the molecular weight Hint: Sort the weight ranges by 40.tabel hieronder tot in each case. een desimale plek in elke geval. BIE Format Investigator Investigator Investigator Ondersoeker Ondersoeker Ondersoeker B Video Demonstrasie Hydrometer reading Hidrometer lesing 0.985 0.984 0.986 (g.cm-3) Percentage Alcohol Persentasie Alkohol 11.2 12.4 10.0 (%) Path: table IIA. Draw structure of compound. B. Label base peak and molecular ion peak.
- LTE lI. 9:.0 A docs.google.com Llä 4 A strong absorption band at 3400 cm-1 in an IR spectrum indicates the presence of a/an Ether Alkyne Carbonyl group Alcohol Llä 4 The vibrational frequency for molecule calculate by using v/2Mc = (µ/F)½ v=1/2nC (F /)½ v=1/2nC (µ/F)½ v/2n= C (F/µ)½ blö 4 The IRepoctrumof methyl salicylate4. (14 points) A soil sample (4.00 g) is digested and analyzed for Cd by atomic absorption analysis. The digestion results in 25.0 mL of extract. Because there is concern of matrix effects, standard addition is used. A portion of the extract is analyzed directly by AA and gives an absorbance of 0.211. Another 10.0 mL portion of the extract is spiked with 50.0 ug of Cd (ignore any added volume from Cd spiking) and gives an absorbance of 0.539. a) Calculate the Cd concentration in the (unspiked) extract (in ug/mL). (8 pts) b) Calculate the Cd concentration in the soil in ppm (by mass). (3 pts) c) A Cd standard prepared in dilute nitric acid to a concentration of 1.00 µg/mL is analyzed and gives an absorbance of 0.191. Was the standard addition justified? (3 pts)(b) Based on the perfomance and validation methods, explain the distinctions between the two tems listed below: (1) linearity and coefficient of detemination (ii) intra-day and inter-day precision (ii) absolute recovery and relative recovery (iv) limit of detection and limit of quantification (v) selectivity and specificity
- In the development o f an analytical method for the quantitative analysis o f iron using Atomic Absorption spectrophotometry (AAS), a linear calibration curve for standards o f 0.00, 5.00, 10.00, 15.00 and 20.00 ppm was prepared. An iron ore sample with an expected iron content o f 40-60% w/w is to be analysed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum amount o f concentrated HC1 and diluted to 1 L in a volumetric flask using distilled water. A 5.00-mL aliquot is removed with a pipette. With explanation, to what volume (10, 25, 50, 100, 250 500 or 1000 mL) should the 5.00 mL aliquot be diluted, to minimize the uncertainty in the analysis?ge - mylau X Homepage- Genera X Pearson MyLab and Mas X O MasteringChemistry X v JS CH15 2022 W - Ge X I2I JS CH12 2022 W Not X O https://session.masteringchemistry.com/myct/itemView?assignmentProblemID=187325178&offset=next ssigment e 16.50 - Enhanced - with Feedback and Hints Part A What mass"of ammonium chloride should you add to 2.60 L of a 0.155 mol L-1 NH, to obtain a buffer with a pH of 9.50? For ammonia, K =1.76 x 10-5 Express your answer in grams to two significant figures. > View Available Hint(s) m Submit Request Answer wide Feedback O Type here to search 5°C I 8. 立Binary mixtures of NiO and Mo were prepared containing 20,50,and 80 weight percent of NiO. 20g of Al (internal standard) were added to 70 g of these mixtures and to 70 g of an unknown mixture of NiO and Mo. The intensity of suitable reflections were recorded. NiO(wt%) Mo(wt%) I(NiO) I (Mo) I (Al) I(NiO)/I(Al) I(Mo/IAl) 20 80 73 639 246 50 50 196 423 261 80 20 508 271 423 Unknown 227 364 263 Calculate I(NiO)/I(Al) and I(Mo)/I(Al) and plot vs % NiO and % Mo respectively Determine composition of unknown : wt % NiO and wt % Mo in unknown mixture
- A sample of body serum is to be analysed for sodium by flame emission spectroscopy. 1.00cm' aliquot of serum was pipetted into each of two 50.0cm' volumetric flasks. The first flask was diluted to volume with deionised water. The absorbance of this first solution was0.350. To the second flask 10.0 cm' of a 25.0 ppm sodium standard was added and the flask made up to volume with deionised water. The absorbance of this second solution was 0.720.(i) Calculate the concentration of the sodium in the body serum in mg dm-3.4) 1.580 g soil sample was analyzed for its copper content. The soil sample was completely digested with HNO3-H2O2 mixture and diluted to 50.0 mL with distilled water. 2.0 mL of this solution was taken into a volumetric flask and diluted to 10.0 mL with distilled water. It was analyzed by FAAS system and its average absorbance was calculated as 0.2564. Calibration plot for copper is shown below. Absorbance 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 10 y = 0,0291x-0,0082 R² = 0,9993 15 Copper, mg/L 20 Calculate the percentage of copper in the soil sample as ppm. 25Below are the IR and mass spectra of an unknown compound. % Transmittance Relative Intensity 100 80- 60 40 20 0 4000 100 80 60 40 20 10 3500 3000 2500 2000 1500 Wavenumber (cm-1) elle 20 30 40 50 60 m/z 70 mm 1000 500 80 90 100