(2) Examine the models of the lattice of ZnS (zinc blende) and Fe metal on display. a) Write the type of unit cell for ZnS: (S is black and Zn is light colored) b) What is the packing of the S atom in the ZnS? (See McMurry & Fay, P. 374, Table 10.10) c) What is the coordination number (CN) of Zn: d) How many Zn atoms are there in a unit cell of ZnS? e) There is another form of ZnS called "wurtzite". How is it different from zinc blende? Zn blende: Wurtzite: ΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛ a) Write the type of unit cell for Fe: b) What is the CN for each Fe atom? *****************************************************k******************************* 3) Examine the models of the covalent network solids, diamond, graphite and ice on display. The white straws represent London dispersion forces in the graphite model and hydrogen bonding in ice. a) What is the hybridization of the C atoms in diamond and graphite? Diamond: Graphite:

(2) Examine the models of the lattice of ZnS (zinc blende) and Fe metal on display. a) Write the type of unit cell for ZnS: (S is black and Zn is light colored) b) What is the packing of the S atom in the ZnS? (See McMurry & Fay, P. 374, Table 10.10) c) What is the coordination number (CN) of Zn: d) How many Zn atoms are there in a unit cell of ZnS? e) There is another form of ZnS called "wurtzite". How is it different from zinc blende? Zn blende: Wurtzite: ΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛ a) Write the type of unit cell for Fe: b) What is the CN for each Fe atom? ***********************k* 3) Examine the models of the covalent network solids, diamond, graphite and ice on display. The white straws represent London dispersion forces in the graphite model and hydrogen bonding in ice. a) What is the hybridization of the C atoms in diamond and graphite? Diamond: Graphite:

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Crystallography

Crystallography is the category of science that focuses on the atomic and molecular arrangements with their bonding constituting the crystal structure. It is derived experimentally and originated in the year 1912. It is a combination of two words; those are crystal, meaning a cold drop, and graph, meaning writing.

Question

(2) Examine the models of the lattice of ZnS (zinc blende) and Fe
metal on display.
a) Write the type of unit cell for ZnS:
(S is black and Zn is light colored)
b) What is the packing of the S atom in the ZnS?
(See McMurry & Fay, P. 374, Table 10.10)
c) What is the coordination number (CN) of Zn:
d) How many Zn atoms are there in a unit cell of ZnS?
e) There is another form of ZnS called "wurtzite". How is it different
from zinc blende?
Zn blende:
Wurtzite:
ΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛΛ
a) Write the type of unit cell for Fe:
b) What is the CN for each Fe atom?
*****************************************************k*******************************
3) Examine the models of the covalent network solids, diamond,
graphite and ice on display. The white straws represent London
dispersion forces in the graphite model and hydrogen bonding in ice.
a) What is the hybridization of the C atoms in diamond and
graphite?
Diamond:
Graphite:

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2. Answer ALL parts a) - c). Sodium ([Ne] 3s¹3pº) forms a simple cubic (sc) primitive crystal structure, in which Na atoms are arranged at the corners of a cube. a) How many atoms are contained in the unit cell, and how many valence bands can be expected? b) Sketch the crystal orbitals at the special points Ã¯'(0,0,0), X(1/2,1/2,0), and M(1/2,1/2,1/2), and hence draw the corresponding band structure along T-X-M-T. c) With the aid of a diagram, explain how the band structure would change if the cube was distorted into a rhombohedron by elongation along a body diagonal?
Please, solve and show your work/explanation for each part.
Note:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.
3. Compare and contrast the two types of close-packing in solids? 4. Why is there % error in part II? What could be the reason for such error? 5. By understanding the structure of crystals molecularly, what is its relation to the strength of materials? 6. Use the internet to search three (3) examples of metals which have HCP, FCC and BCC structures. Relate the structure to the characteristic properties of each metal. Please indicate the condition the given structures are observed.
(c) Three-dimensional hexagonal boron nitride is made up of sheets of the two- dimensional material described above. X-ray diffraction is used to measure the distance between adjacent rows of boron atoms in the layers, and the distance between the two-dimensional sheets. i. Draw diagrams to show how a single-crystal sample of BN must be orientated with respect to the incident and scattered beams in order to make these measurements.
5. a) Draw a HCP unit cell and label (0001), (1100), and (2110) planes, and also specifywhat kind of planes they are (i.e. basal, prism or pyramidal). Also mark the directions [1120] and [0001]. b) Cobalt has close to ideal c/a ratio (1.623) and has a density of 8.86 g/cm3 and atomic mass of 58.93 amu. Calculate its lattice constants (c and a). 6. Write the Pearson symbols of the following elements: Cu3Au (L12), Diamond, β-Zr, y-Feand Mo (1 x 5 = 5)