From the curves shown in Animated Figure and using the following Equation, determine the rate of recrystallization for pure copper at the several temperatures. Make a plot of In(rate) versus the reciprocal of temperature (in K-1). (a) Determine the activation energy for this recrystallization process. (See Section FACTORS THAT INFLUENCE DIFFUSION.) (b) By extrapolation, estimate the length of time required for 50% recrystallization at room temperature, 20°C (293 K). (а) і kJ/mol (b) і days
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- The solvent in a collodial system is also known as the [ ?] phase. A dispersed particle dispersion medium(a) Powder metallurgy (PM) is a net-shape forming process by which fine powdered materials are blended, pressed into the desired shape (compacted), and then heated (sintered) in a controlled atmosphere to bond the contacting surfaces of the particles and establish desired properties. i) Justify the reasons why powder-metal parts are commonly used for machine elements which requiring good tribological characteristics. ii) Compaction is the step in which high pressure is applied to the powders to form them into the desired shapes. The purposes of compaction are to obtain the required shape, density, and particle-to-particle contact. In your opinion, is there any density variation in the compacting of powders? Justify your answer. If your answer is yes, propose appropriate methods to reduce the variation.Answer each of the following by True or False. Q1) Solution resistance varies as the frequency of the applied voltage charges, then resistance is normally named as impedance.( ) Q2) Physisorption or physical adsorption is a type of adsorption in which the adsorbate adheres to the surface only through Van der Waals.( ) Q3) Michelson interferometer is considered energy dispersive spectrometer for spectral analysis.( ) Q4) lodine when mixed with starch gives deep red complex.( ) Q5) (BET) theory aims to explain the physical adsorption of gas.( ) Q6) The iodination of acetone can be easily investigated because iodine has a deep green color.( ) Q7) Activated charcoal or activated carbon is carbon material that has been processed to contain many large pores creating a very large surface area.( )
- ADSORPTION STUDIES Aim: To determine the adsorption constants for the adsorption isotherm of Oxalic acid (C2H2O4) on activated carbon. I want Discussion and Analysis for thatit has been noticed that adulteration of palmoil with carcinogenic dyes is on high.use the knowledge of analytical process to outline protocols you will follow to determine the quantitative and qualitative amount of the toxic dye spectroscopically.A 1.59 g sample containing KI was analyzed gravimetrically and 0.0538g of Barium Iodate was recovered... express the results of this analysis as percent posassium iodide.
- 18. Jet is an undergraduate chemistry student, he’s out in the laboratory trying to determine the volatile organic compounds as well as overall protein content of the leaf and stem of a malunggay (Moringa oleifera). He subjected the leaf and stem in a separate digestion reaction (treatment of sulfuric acid), afterwards he subjected the products to high temperature induction to get a dry ash like substance. Which type/s of chemical analysis did Jet employ to reach his objective?I. Qualitative AnalysisII. Quantitative Analysis III. Instrumental Chemical AnalysisIV. Wet Chemical AnalysisA. II & IV onlyB. I & IV onlyC. I, II & IV onlyD. I, II, III, IVThe purpose of adding sodium sulfate in the extraction is to decrease the solubility of caffeine in dichloromethane. Hence, the residue could contain water and other impurities. a First statement is true. Second statement is false. b First statement is true. Second statement is false. c Both statements are false. d Both statements are true.Template Assisted Crystallization (TAC) is a a commercial softening alternative. Which of the following description is wrong O A. TAC involves the adsorption of cations and anions O B. TAC involves the crystallization of hardness ions O C. TAC involves the detachment of nanocrystalls back to the treated water O D. TAC has a greater removal efficiency for hardness than RO or ion exchange
- 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.One of the most important reactions in biology is photosynthesis. In this complex chemical process, plants combine molecules of carbon dioxide and water to create glucose and oxygen. The reaction looks something like this: CO2 + H20 – C6H1206 + 02 Of course the number of atoms don't balance on the two sides. You might be able to intuit your way to the correct counting (stoichiometry), but let's do it systematically by setting up equations. (a) Write the reaction as a CO2 + b H20 -→ c CGH1206 + d O2 where a, b, c, and d are meant to be integers adjusted so that the number of each kind of atoms balance on each side. For this reaction, we have three kinds of atoms that must balance: carbon (C), hydrogen (H), and oxygen (0). Write three equations for a, b, c, and d that, if satisfied, will guarantee that the number of atoms of each kind are the same on each side of the reaction. (b) Find the smallest set of integers that will satisfy these equations. First, solve for a. (c) Solve for b.7. Determine the effective diffusivity for a substrate passing through each of the following membranes: The substrate has a free solution diffusivity (D.,.) of 8.13 * 106 cm²/s and has a molecular radius of 7.54 Å (Angstroms). Membrane Type Mean pore diameter (nm) Porosity (%) Tortuosity Cellulose-1 12.16 67.9 2.97 Cellulose-2 9.65 78.7 1.76 Which membrane would you recommend using to avoid diffusion-limited reactions? Acrylic Fiber 8.72 85.9 3.83