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- Determine the structure factor for the basis of the diamond. (a) S, =1+e 4+*+) basis (b) Spask =1+e? (c) Spasis =e (d) Spasis =1+ei+½+%)3.Explainthethin-layerchromatographicpuritycheckprocedureforanalysisofanunknownorganic compound.True of false? 1. Raman Spectroscopy can be used in the airport to detect the presence of Alcohol in the bags? 2. Furnace atomisation is used when the concentration of the sample in the ppb level? 3. 24 karat of gold mean the percent of gold in the object is 75%?
- 3. (a) The following are the results from subjecting the lectin to SDS-PAGE: Band / Molecular Length 210 100 67 48 32 Lectin Weight (kDa) of Gel Migration Distance 7.2 1.8 2.5 3.2 3.9 4.7 3.5 (cm) Determine the molecular weight of the lectin. Show all workings.4.Discussed the Purposed of the Golden rules in the practice of Forensic Chrmistry.The following data were obtained for four compounds separated on a 20 m capillary coloumn. Compound t,(min) w(min) A 8.04 0.15 B 8.26 0.17 C 8.43 0.18 (a)Calculate the number of theoretical plates for each compound and the average number of theoretical plates for the column. (b) calculate the average height of theoretical plates. (c) explain why it is possible for each compound to have a different number of theoretical plates?
- (7). (a) Write full forms of following thermoanalytical techniques: (i) TGA (ii) DTA (iii) DSC (iv) PTGA (v) EGA. (b) A thermogram of a magnesium compound shows a loss of 91.0 mg from a total of 175.0 mg used for analyte. Identify the compound either as MgO, MgCO3, or MgC₂04.4g 5 g 2 g 100 g 49." R Lactic acid Salicylic acid Trichloroacetic acid Flexible collodion qs ad Sig: wart remover. Use as directed. (a) Flexible collodion contains 20% w/w camphor and 30% w/w castor oil. How many grams of each would be contained in 30 g of the mixture? (b) The specific gravity of castor oil is 0.955. How many milliliters of the oil is contained in 30 g of the mixture? (c) If the specific gravity of the mixture is 0.781, what are the percent w/v con- centrations of lactic acid, salicylic acid, and trichloroacetic acid in the mixture?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 ...
- ography (a) Derive the relationship between diffusion analyte current and concentration of an in polarography.An amount of pore gypsum was calcined at 200°C. After that, 1000 kg of the product was mixed 150 kg of water How much gypsum is obtained? (Molar mass of some elements: P 31, Cl 35, Ca40, N14, F19, 016, S:32, C12, H1, Mg 24) Lütfen birini seçin: O A. -1265 kg O B.-717 kg O C -566 kg O D. =265 kg O E. -825 kg4. (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)