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Briefly state the structural requirements of perovskites.
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- Which of the following reactions is/are consistent with Markovnikov's rule? Br (a) + HBr (b) + HBr Br Br (c) + HBrDetermine 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.1. What are the important considerations in determining the % ash content and elemental contents of plants under investigation? 2. Suggest other methods of analysis of commercial herbal drugs. Enumerate and discuss each.
- Investigate and explain two experimental methods to measure the molecular ` weight distribution of polymers.(d) Crystalline polyethylene has a density of 1000 kg m³ and amorphous polyethylene a density of 865 kg m3. Calculate the volume fraction crystallinity of a sample of branched polyethylene which has a density of 900 kg m. Why is the crystallinity of this sample so low?Suppose two phosphate groups in DNA (each with a charge of 21) are separated by 12 Å. What is the energy of the ionic interaction between these two phos- phates assuming a dielectric constant of 80? Repeat the calculation assuming a dielectric constant of 2.
- based on the conductivity results of glacial acetic acid, does acetic acid exist predominantly as ions or molecules?b) Determine the standard enthalpy change and std. Gibbs free energy change of reaction at 400 k for the reaction СO(g) +2H2(g) — CHОН (g) At 298.15 K, AH.co (0)= -26.41 kcal/mol, AH AG.co (9)= -32.8079 kcal/mol, AG cH,oh(9)= -38.69 kcal/mol, °.CH20H(9)= -48.08 kcal/mol, The standard heat capacity of various components is given by, CO = a + bT + cT² + dT³, where C, is in cal/mol-K and T is in K b x10² с х105 d x10° Соmponent CH3OH а 4.55 2.186 -0.291 -1.92 CO 6.726 0.04 0.1283 -0.5307 H2 6.952 -0.0457 0.09563 -0.20795. Briefly discuss permeability in polymers with equations and conditions controlling permeability. Give 2 applications of semipermeable polymeric membranes in Biological and chemical systems.
- 7. (a) Discuss the viscosity method for calculating the molecular mass of polymers.From the practical standpoint, is it better to use a "good" solvent or a "poor" solvent when measuring polymer molecular weight? Explain.Which method would you use for quantitative analysis of O3, NOx, CO, alkanes? Explain their principles and draw diagrams of instruments.
