(a)
Interpretation:The effect of structure of a polymer on the melting point of the material.
Syndiotactic | Atactic |
Where |
Concept introduction:The tacticity of polymer is an important property of oligomer, where the repeating unit of the polymer is a small molecule. The tacticity mainly arise on the substitution of the in line
(b)
Interpretation:The reason behind the high cost of syndiotactic polymers over atactic polymers.
Concept introduction:The tacticity of polymer is an important property of oligomer, where the repeating unit of the polymer is a small molecule. The tacticity mainly arise on the substitution of the in line polymeric unit. The arrangement of the substituted entity arise various tacticity in the polymers in the name of isotactic, syndiotactic and atactic.
Syndiotactic | Atactic |
Where |
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Chemistry for Engineering Students
- 8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap in the material. Generally, in order to have a larger band gap, the dopant should be smaller than the main material. If you are a materials engineer and need a semiconductor that has lower conductivity thin pure silicon, what clement or elements could you use as your dopant? (You do not want either an n- or a p- type material) Explain your reasoning.arrow_forwardWhat is the relationship between the structures of buckminsterfullerene and carbon nanotubes?arrow_forwardWhy is the C 60form of carbon called buckminsterfullerene?arrow_forward
- If an ionic solid has an fcc lattice of anions (X) and all of the tetrahedral holes are occupied by metal cations (M), is the formula of the compound MX, MX2, or M2X?arrow_forwardIf one edge of the silicon carbide unit cell is 436.0 pm, what is the calculated density of this compound? (a) 0.803 g/cm3 (b) 0311g/cm3 (c) 321 g/cm3arrow_forwardThe unit cell of a compound containing potassium, aluminum,and fluorine is shown here. (a) What type of latticedoes this crystal possess (all three lattice vectors are mutuallyperpendicular)? (b) What is the empirical formula?arrow_forward
- The maximum wavelength of light that a certain silicon photocell can detect is 1.11 μm. (a) What is the energy gap (in electron volts) between the valence and conduction bands for this photocell? (b) Explain why pure silicon is opaque.arrow_forwarddo (b) What is the relationship between the length of the face diagonal and the radius, r, of the atoms in the cell? (Enter a mathematical expression.) face diagonal = (c) How is the radius of the atoms related to do? (Enter a mathematical expression.) r = (d) Gold metal crystals have an FCC structure. The unit cell edge in gold is 0.4078 nm long. What is the radius (in nm) of a gold atom? nmarrow_forwardSample Exercise 6: Empirical Formula and Density: Ionic Solid The unit cell of a binary compound of copper and oxygen is shown here. Given this image and the ionic radii rcut = 0.74 Å and ro² = 1.26 Å, (a) determine the empirical formula of this compound, (b) determine the coordination numbers of copper and oxygen, (c) estimate the length of the edge of the cubic unit cell, and (d) estimate the density of the compound. Solution (a) To determine the empirical formula we need to determine how many of each type of ion there are per unit cell. O: 8(1/8) + 1 = 2 0²-ions in the unit cell. Cu: 4(1) = 4 Cut ions in the unit cell. Empirical Formula: Cu₂O (b) If we can visually determine the coordination number of one of the ions, we can use Equation 12.1 to determine the coordination number of the other ion. Number of cations per formula unit Number of anions per formula unit anion coordination number cation coordination number Cation coordination number = anion coordination number Copper…arrow_forward
- Consider the two ceramic atomic packing arrangements shown in the Figure. The radius of the anion is RA=0.2 nm. At i) the smallest stable cation size in I) and ii) the largest stable cation radius in II), what are the radii of the cations? What are these arrangements called? Select one: 1) 2RA a. 1.00 RA, 0.155 RA; hexagonal, triangular O b. 0.225 RA, 0.732 RA; tetrahedral, octahedral OC. 0.155 RA, 0.414 RA; triangular and tetrahedral d. 0.225 RA, 0.732 RA: cubic, triangular II)arrow_forwardWhat is the answerarrow_forwardWhat is the formula of a compound in which the element ‘Y’ form hep lattice and atoms of ‘X’ occupy 1/3 r“ of octahedral voids.arrow_forward
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