15. Lead crystallizes in the face-centered cubic lattice. What is the coordinati
ID: 547164 • Letter: 1
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15. Lead crystallizes in the face-centered cubic lattice. What is the coordination mumber for A) 4 B) 6 C)8 D) 10 E) 12 16. The complex ions (Cr(en CIBr]Br and [Cren)-Br:)C l are called a) optical isomers b) ionization isomers e) linkage isomers d) geometrical isomers 17. Which complex is optically active? le NH, d) a) b) c) 18. Cations are present in the interstitial sites in b) Shotky defect c) Vacancy defect d) metal deficiency defect a) Frenkel defect 19. Which of the following species is a Lewis acid, but not a Bronsted acid? Part II. Show your work on math problems The density of an ionic compound was calculated by x-ray diffraction to be 2.411 gem3, when the density of the solid was determined by directly measuring the mass and volume of a bulk sample the density was determined to be 2.360. What type of defect is responsible for the dffer- ence in density observed? Explain. 3pts 1· Label band diagrams as an insulator, semiconductor and a metal. Label the two bands. Draw a band diagram that would represent a n-type semiconductor. 5 pts 2.Explanation / Answer
15. The Pb atom on the face center has 4 immediate neighbours and 2 body-centre neighbours. Therefore CN = 6.
16. The difference between these complexes is that different groups ionized. Thus, they are ionization isomers.
17. option d) is optically active.
18. In frenkel defects, the displaced cation takes a new interstitial position. option a)
19. option C) because Al3+ can take lone pair due to presence of empty orbitals, but it cannot give an H+.
20. Shottky defect is responsible for this discrepancy because the displaced ion leaves the lattice, thus reducing the mass of the crystal.
21. 1st - metal, 2nd - semiconductor , 3rd - insulator.
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