A groundwater aquifer is contaminated with benzene. Contrast the relative effectiveness of air stripping to activated carbon adsorption by providing a preliminary design of each process
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A groundwater aquifer is contaminated with benzene. Contrast the relative effectiveness of air stripping to activated carbon adsorption by providing a preliminary design of each process
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- Arrange the gases CO, N2 and CH4 in increasing order of adsorption on the surface of charcoal in a closed vessel. Give reasons also.(c) State the assumptions and limitations of Langmuir's Adsorption equation for a gas on solid.At room temperature, the equilibrium mole fraction of vacancies in a crystal is 10-12. Now the crystal is subjected to irradiation which creates a great number of vacancies leading to a vacancy mole fraction of 0.01. What is the chemical potential of the vacancies in the irradiated crystal?
- (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.Read the excerpts from chemistry journal articles. Determine which section each quote was likely derived from, then label the quote accordingly. "A total of 18 GFRP-SR confined concrete cylinders with a diameter of 150 mm Discussion and a height of 300 mm were constructed and tested under axial compression." "Since Alfred Loomis's studies in the 1920's, ultrasonic waves of various frequencies have found uses in areas such as medical imaging, geological imaging Introduction (SONAR), industrial cleaning and welding, solution mixing, and even jewelry cleaning." %3D "The thermogram of the pure NIA revealed a sharp endothermic signal with maximum Experimental at 204.75 °C, and AH = 30.54 kJ/mol, that corresponds with the melting of the NIA." "As we have demonstrated here that a pulse of blue light 450–475 nm, the simulating wavelength of melanopsins and/or cryptochromes, increases the expression of Per1 Results and Per2, one of these photopigments is most probably responsible for light…What part does adsorption play in froth floatation for the concentration of sulphide ores and heterogeneous catalysis?
- Describe, with using necessary diagrams, the structure and/or microstructure of the following materials and justify their applications based on their properties. Plain carbon steel (0.25% C), as used to make a body panel for a car Duraluminum 2024: as used to make aircraft structures High density polyethylene (HDPE), as used to make non-carbonated drinks containers Silicon carbide, as used in ball type flow control valves Carbon fibre reinforced polymer (CFRP), as used in the construction of high-end automobile racingDetermine the solubility parameters for amorphous polypropylene and poly(methyl methacrylate). (Densities of the two polymers are 0.905 and 1.18 g/mL, respectively.) Consult a polymer handbook and suggest suitable solvents for the two polymers on the basis of solubility parameters.Polymeric composite materials can be obtained by adding fillers in the form of particles or fibers in a polymeric matrix and are intended to form a new material with properties different from those of pure components. Regarding polymeric composites, review the statements below and check which is true and which is false. (I) The mechanical properties of a fiber reinforced polymer composite are not influenced by fiber length. (II) Composites with unidirectional continuous fibers have isotropic mechanical properties. (III) The interfacial adhesion between matrix and dispersed phase does not influence the magnitude of the final mechanical properties of the composite. (IV) In polymeric composites, fibers are normally less ductile than polymeric matrices. (V) The specific area of a material at the nanoscale is significantly less than the specific area of the same material at the microscale.
- For each of the following questions, more than 1 answer may be correct: 1. Molecular adsorptiona. Describes the adsorption of gases on the surface of a solidb. Is used in the separation of substancesc. Describes the preferential adsorption of substances with positively or negativelycharged function groupsd. Has utility in the production of purified water in pharmacy 2. Mechanism of action of polar solvents (water) includesa. Dissolving with similar internal pressures through induced dipole interactionsb. Breaking covalent bonds and ionized weak electrolytec. Formation hydrogen bridges with non-electrolytesd. Reduction the attraction between the ions of strong and weak electrolytes.About the adsorption process and phenomenon, discuss the interactions between solid and adsorbent in chemisorption and fissorption.0.1 g of a zeolite adsorbs 5.58 cm³ of N2 gas at a pressure of 5.56 mbar, and 22.22 cm3 of N2 gas at 13.95 mbar. If the surface area covered by one molecule of nitrogen is 16 Å?, and a mole of gas occupies 22.4 x 103 cm3, calculate the zeolite surface area in cm? g-1.