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- The melting points of diamond and graphite are greater than 3550 °C, but C60 sublimes between 450 and 500 °C. Please explain this observation.Amorphous silica, SiO2, has a density of about 2.2 g/cm3,whereas the density of crystalline quartz, another form ofSiO2, is 2.65 g/cm3. Which of the following statements isthe best explanation for the difference in density?(a) Amorphous silica is a network-covalent solid, but quartzis metallic.(b) Amorphous silica crystallizes in a primitive cubic lattice.(c) Quartz is harder than amorphous silica.(d) Quartz must have a larger unit cell than amorphoussilica.(e) The atoms in amorphous silica do not pack as efficientlyin three dimensions as compared to the atoms in quartz.Determine which among the metals below have low, medium, high, or very high melting point. Please only choose an answer among low, medium, high, or very high. Do not just provide the exact melting point. 1. zinc2. lead3. zirconium4. gold5. aluminum6.iron7. tungsten8. silicon
- Define the term Interstitial alloys?A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide (PbS), quartz which is SiO2, and iodine. The results of her investigations are: (a) W is a good electrical conductor; X, Y, and Z are poor electrical conductors. (b) When the solids are hit with a hammer, W flattens out, X shatters into many pieces, Y is smashed into a powder, and Z is not affected. (c) When the solids are heated with a Bunsen burner, Y melts with some sublimation, but X, W, and Z do not melt. (d) In treatment with 6 M HNO3, X dissolves; there is no effect on W, Y, or Z. On the basis of these test results, which samples are; Au, PbS, SiO2, and I2Pure gold crystallizes in a face-centered cubic unit cell with an edge length of 4.08 Å. The alloy called 18-karat gold consists of 75% Au, 8.0% Ag, and 17% Cu by mass. What are the subscripts in the empirical formula of 18-karat gold (Au(x)Ag(y)Cu(z)) to two significant digits?
- Which group of physical properties would be most helpful in identifying a mineral specimen? (Think carefully - some properties are more helpful than others.) Question 8Answer a. Color, fracture, mass b. Mass, density, shape c. Luster, crystal structure, cleavage d. Crystal structure, hardness, shapeHave each group member select and study a material from the section on ceramics, cement, and glass. Take turns describing your material to the group, and see if they can identify the type of material based on your description (without consulting the text).What is the composition, in atom percent, of an alloy that contains 44.5 lbm of silver, 83.7 lbm of gold, and 5.3 lbm of Cu?