Ceramics used as abrasives must be hard and tough and be able to withstand high temperatures that arise from frictional forces. What is the minimum required hardness (measure in Mohs scale) for a material to be used as abrasive? Your answer
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- At room temperature, the edge length of the cubic unit cell in elemental silicon is 5.431 Å, and the density of silicon at the same temperature is 2.328 g cm-3 . Each cubic unit cell contains eight silicon atoms. Using only these facts, perform the following operations.(a) Calculate the volume (in cubic centimeters) of one unit cell.(b) Calculate the mass (in grams) of silicon present in a unit cell.(c) Calculate the mass (in grams) of an atom of silicon.(d) The mass of an atom of silicon is 28.0855 u. Estimate Avogadro’s number to four significant figures.is the study of fundamental principles of nanostructures between bulk and atomic properties.The thermal and mechanical processing of materials is an important step in ensuring that they have the appropriate physical properties for their intended application. Suppose a metallic element undergoes a phase transit ion in which its crystal structure changes from cubic close-packed to bodycentredcubic. (a) Does it become more or less dense? (b) By what factor does its density change?
- Use the following atomic masses (in g/mol):Mg = 24.31; O = 16; Ca = 40.08; C = 12.01; Na = 23; H = 1; N = 14.01; S = 32.06; Cl = 35.45; 2.) Limestone consists chiefly of mineral calcite (CaCO3). The carbonate content of 0.5413g of powdered limestone was measured by suspending the powder in water, adding 10mL of 1.392M HCl and heating to dissolve the solid and expel CO2. The excess acid required 39.96mL of 0.1004M NaOH for complete titration to a phenolphthalein end point. Find the % wt of calcite in limestone.C: Explain and draw Points Defects of crystalline engineering materials.what is TRIIPPLE POINT 62
- 8. For a bronze alloy with a cross-sectional area of 300 mm² and a modulus of elasticity of 120 GPa, the maximum stress that can be carried by the alloy without plastic deformation is 300 MPa. If the original specimen length is 95 mm, what is the maximum length to which it may be elastically stretched? (a) 0.24 mm (b) 95.24 mm (c) 237.50 mm (d) 332.50 mmUse the Born-Mayer equation to estimate the latticeenthalpy of calcium sulfide. CaS. The crystal adopts a rocksalt structure w ith the distance between the centres of nearest neighbours being 284 pm.Answer with true (T) or falls (F), corrects the wrong phrases, and gives short reasons for correct statements: 1- The atomic bonding is weaker than metallic bonding. من اضعف x2- The starting and finishing solidification temperatures for pure metal are the same. 3- The result of normalizing process is coarse pearlit 4- The austenite can be existed at room temperature. 5- Increasing temperature will increase the magnetization of steel.
- The thermal and mechanical processing of materials isan important step in ensuring that they have the appropriatephysical properties for their intended application. Suppose ametallic element undergoes a phase transition in which itscrystal structure changes from cubic close-packed to bodycentred cubic. (a) Does it become more or less dense? (b) Bywhat factor does its density change?Please provide step-by-step anwser What is the probable lattice type of crystalline substances that give the following observed reflections? Body centered? Face centered? Etc.? (a) 100, 110, 111, 200, 210 (b) 001, 110, 200, 111, 201Scence Midterm Summ X Material%20Science_Midterm%2 x ewer?url=https://ttu-storage.s3.eu-central-1.amazonaws.com/account 1/attachments/390676/Ma ence Midte 02021.pdf Open with Google Docs 5. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute its theoretical density: 6. Below is a unit cell for a hypothetical metal. (a) To which crystal system does this unit cell belong? 40nm 030 nm 0.30 nm (b) What would this crystal structure be called? 1 1 2 7. Sketch a tetragonal unit cell. and witnin that Page Hocations of the point: DELL