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- (a) Solid Agl and ß-alumina (NaAl11017) are both good conductors at elevated temperatures. Pure Zro2 is an insulator but a solid solution ZrO2 (10% CaO) is a good conductor at high temperature.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+%)The temperature-dependent form of the extended Debye-Hückel equation is (-1.825 × 10°) (eT)¯ 2 Va log (y) = 1+ 2.00/eT where y is the activity coefficient, e is the dielectric constant of water (a unitless quantity), T is the temperature (in Kevin), z is the charge of the ion, µ is the ionic strength (in moles per liter), and a is the ion size parameter (in picometers). The temperature- dependence of the dielectric constant is given by the equation e = 79.755e(-4.6×10~³)(T–293.15) where the temperature is in Kelvin. What is the value of the activity coefficient of Pb2+ at 70.00 °C when the ionic strength is 0.014 M? étv O, hulu MacBook Pro G Search or type URL 24 4. % & 5 8 R. T. Y U F G H K V. M 0O
- 1). The susceptibility of FeCl₂ obeys the Curie-Weiss law over the temperature range 90 K to room temperature (293K), with 0 =48K. Its molecular susceptibility at room temperature is 1.475 1022 emu/Oe g mol). (Use: N= 6.022 x 1023 atoms/g-mol, KB= 1.38 × 10-¹6 erg/K) (a) Show that the effective magnetic moment is 5.4 µB. (b) Show that the value of J is 2.25. (c) At an applied field of 8000 Oe, what is the value of the molecular field at 0 °C ?2. What is the overall charge on the 2:1 layer in a smectite with a 2:l layer composition of Alı sMgo 2Si3 sAlo 2010(OH)2? What is the overall charge on the 1:1 layer of kaolinite with a composition of Al,SizOs(OH),? What implications does this have for the cation exchange capacity of each (< 3 sentences)?(a) Write TWO (2) functions of XRF in materials characterisation.(b) Appraise the sample preparation for X-ray Diffraction (XRD) Test.(c) Support the idea of solid material can be described as amorphous and crystalline especially in XRD characterization.(d) Compare between X-ray Powder Diffaction (XRD) and X-ray Fluorescence Spectrometry (XRF) in terms of their similarities and differences.
- 3) Name the errors of glass electrodes in potentiometric measurements (please write correctly and concisely).What are the advantages of a dropping-mercury electrode in polarography? Why is polarography used mainly to study reductions rather than oxidations?a) Calculate the basicity and acidity of a slag composed of 41 wt% SiO2; 13 wt% FeO; 39 wt% CaO, 7 wt% MgO. (Molecular Weights; Ca: 40.08, O: 16.0, Fe: 55.85, Si: 28.08, Mg: 24.31) b) Describe the formation stage of white matte during the pyrometallurgical production of copper. Calculate the theoretical amount of Cu in the white matte. (Molecular Weights; O: 16, Fe: 55.85, Si: 28.08, Cu: 63.5, S: 32.06).
- What is the major limitation of IR regarding the materials that can be used for instrumental components.A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53%. Calculate the 90% confidence interval for the mean of the the three data, assuming that (a) the only information about the precision of the method is the precision for the three data. (b) on the basis of long experience with the method, it is believed that s---->σ lindane. (c) If s=0.28 is good estimate of σ, how many replicate measurement should be made in order for the mean for the analysis of sample to be within 0.2% of the true mean 90% of the time.Assuming that the density of silica gel is 2.65 g cm-3 and that the silica particle are spherical with an average radius of 5 x 10-6 cm, calculate the estimated surface area Sest. Why is there such a large difference between S and Sest?
