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Q: w
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A: The solution is given below -
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Question No. 3
a) Calculate the degree of
g/mol, having monomer of C8H8O4.
b) Calculate the Degree of Crystallinity of the composite having mineral particles of 15(%) by weight
has enthalpy of melting of 31.3 (J/g) and enthalpy of crystallization of 24.4 (J/g). if, Δhm100 = 90
(J/g). The Specific gravity of the matrix and particles is 1.24 and 2.2 respectively.
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- (a) Describe the structure of each of the categories of polymers below. Thermoplastics: Thermosets: Elastomers: (b) Of the above polymers, which behaves most like a ceramic? Explain your answerThe best known acrylic is polymethylmethacrylate, which is sold as a product known as lucite. (a) Sketch the structure of the polymer. (b) Is it linear or network-shaped?, (c) Is it crystalline?, (c) Is it thermoplastic?An alloy structure (element: Co, Y, Si) adopts the cubic crystal structure with lattice constant a = 5.19 Å. Please determine (1) the bond length between Co-Y, Co-Si, Y-Si. (2) the density of the alloy. (Hint: atomic weight for Co: 58.9 g/mol; Y: 88.9 g/mol; Si: 28 g/mol; Avogadro constant: NA = 6.022 ×10²³ mol-1).
- Identify the type(s) of bonding that would be expected for each of the following materials: (i) Super—alloy (Cu—Ni alloy) (ii) Polycarbonate (iii) RO (Reverse Osmosis) WaterFigure 2: A hexagonal close-packed layer of atoms in two dimensions. (b) Figure 3: Conventional unit cells for: (a) the fcc structure; (b) the bcc structure. (a) a) A hexagonal close-packed layer in two dimensions is shown in figure 2. By identifying a suitable unit cell, calculate the packing fraction of this structure. b) Two possible cubic crystal structures are shown in figure 3. Part (a) shows the fcc struc- ture, in which atoms are touching along a face-diagonal. Part (b) shows the bcc structure, in which atoms are touching along a body diagonal of the cube. Calculate the packing fractions of each of these structures. Which one of them is close- packed? c) Copper (Cu) has an fcc structure, where the mass of a Cu atom is 63 in atomic mass units. The density of Cu is 8.9x10³ kgm-³. Tungsten (W) typically has a bcc structure, where the mass of a W atom is 184 in atomic mass units. The density of W is 19.3x10³ kgm-³. (i) Use the above data to find the radius of a Cu atom, and of a W…PTFE polymer has a very high crystallinity among known commercial polymers. write down the reasons
- (a) Why electrical conductivity of the semiconductor increases with increase in temperature? Illustrate and explain the above effect with hypothetical band energy diagrams, showing one at 25 °C and another at 50 °C? (b) The number average molecular weight of polyvinyl chloride (PVC) is 110000 g/mol and the Polydispersity index (PDI) is 1.3. What is the weight average molecular weight and degree of polymerization of PVC? Note: Molar mass of vinyl chloride is 62.498 g/molA special material has a hexagonal close-packed (HCP) structure at 334° and below where a 3.789 Å and c = 12.280 A. It has a face-centred cubic (FCC) structure at 335° and above where a = 5.313 Å. The material has a density of 6.146 Mg/m² and an atomic mass of 139.916 g/mol. Find (a) the number of atoms in the HCP structure. (b) the percentage of volume change when the transformation from HCP to FCC occursThree molecular requirements for crystallinity in polymers
- Polymers do not crystallise easily because:a) they are long chain moleculesb) they contain covalent bondsc) the molecules are interconnected with H-bondingThe angle of diffraction of (220) set of planes for an FCC element occurs at 69.22° when monochromatic x-radiation having a wavelength of 0.1542 nm is used. (a) Calculate the atomic radius of the element; (b) Calculate the angle of diffraction from the set of planes (310).3. a) Calculate the atomic packing factor for the face-centered cubic (FCC) crystal structure.