A sample of mineral containing water as the only volatile constituent contains 26.40% SiO2 and 8.86% H2O. What is the corrected percentage of SiO2 (%SiO2) in the material after sufficient heating to drive off all of the water?
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A: The values are given as follows:
A sample of mineral containing water as the only
volatile constituent contains 26.40% SiO2 and
8.86% H2O.
What is the corrected percentage of SiO2
(%SiO2) in the material after sufficient heating to drive off all
of the water?
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- 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.As the degree of vitrification of clay-based products increases, which of the following also increase(s)? A = strength; B = amount of shrinkage; C = porosity; D = density A, C and D A, B and C А, В and D B, C and D O A, B, C and DDraw and explain pressure-density phase diagram for CO2.
- An aerospace manufacturer is building a prototype experi-mental aircraft that cannot be detected by radar. Boron nitride ischosen for incorporation into the body parts, and the boricacid/ammonia method is used to prepare the ceramic material.Given 85.5% and 86.8% yields for the two reaction steps, howmuch boron nitride can be prepared from 1.00 metric ton of boric acid and 12.5 m³ of ammonia at 275 K and 3.07X10³ kPa?Assume that ammonia does not behave ideally under these con-ditions and is recycled completely in the reaction process.For the shown crystal structure, write down (a) the Bravais lattice and (b) the basis of the primitive unit cell. For this structure a=b= c and a=B=y%3D90°. The green (A) atoms at the vertices; blue (B) atom at the center, pink (C) atoms are the centers of two opposite faces; and brown (D) atoms at the centers of four edges of the unit cell. Note that the a, b and c translation vectors are along the positive x, y and z axes, respectively, as shown. CODExplain (i) The basis of similarities and differences between metallic and ionic crystals.
- Crystal structure of Alo.5Gao.5AS Based on the zincblende crystal structure for GaAs, sketch the structure of Alo.sGao.5As. The lattice constant for Alo.sGao.5As is a = 5.653 Å. (a) Calculate the atomic density per unit volume for Alo.5Gao.5As. (b) What is the atomic density per unit area on the (100) and (110) planes? (c) The atomic radii for Al, Ga, and As are, respectively, 1.25 Å, 1.30 Å, and 1.15 Å. Using the hard-sphere model, estimate the lattice constant for Alo.5GA0.5As and compare the result with the value given above.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.(b) Using the Crystallographer's formula to determine the density (in g/cm³) of Po: ρ = Σ Ζ * Μ Vell* N You must know that a primitive cubic cell has Z = 1 Since Po is a metal, the value of "i" = 1, since it's the only entity! MM of Po= 208.998 g/mol Vcell (in cm³) = a³ Vcell (3.36 x 10-8 cm)³ = 3.793 x 10-23 cm³ N = 6.022 x 1023 atoms/mol Thus: p = (1 atom/cell) (208.998 g/mol) = 9.16 g/cm³ (3.793 x 10-23 cm³) (6.022 x 1023)
- Minerals that generally form from the evaporation of a water-based solution belong to which chemical group?Titanium carbide, TiC, adopts the rock-salt (NaCl) crystal structure. (i) Draw the unit cell indicating clearly the position of all atoms.(ii) The unit cell parameter for TiC is 0.4329 nm. Calculate the C-Cdistance, the Ti-C bond length and the Ti-Ti distance.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.