Q1- Choose the correct answer for the following (Justify your answer):1-The direction indices for the crystallographic direction indicated by the vector area) [101]b) [ī 1 0]c) [110]d) [111]X2-A metal has an FCC structure with a lattice parameter of 0.362 nm and atomic weight of 63.54 g/mole.The metal density in g/cm3 isa) 8.98b) 897.9c) 0.11d) 58463- If a load is applied on a wire and its radius is stretched to the double. The Young's modulus willa) be doubledb) be halvedc) become four timesd) remain unaffected4- Tensile strength of a material is obtained by dividing the maximum load during the test by thea) minimum area after fracture. b) instantaneous area at fracture. c) original area. d) average of (b) & (c)5- Increasing crystalline imperfections raises thea) conductivityb) electric fieldc) velocityd) resistivity

A). the Direction indices for the cryptographic direction indicated by the vectors [1,1,1]. OPTION…

Q1- Choose the correct answer for the following (Justify your answer): 1-The direction indices for the crystallographic direction indicated by the vector are a) [101] b) [ī 1 0] c) [110] d) [111] X 2-A metal has an FCC structure with a lattice parameter of 0.362 nm and atomic weight of 63.54 g/mole. The metal density in g/cm³ is a) 8.98 b) 897.9 c) 0.11 d) 5846

Q1- Choose the correct answer for the following (Justify your answer): 1-The direction indices for the crystallographic direction indicated by the vector are a) [101] b) [ī 1 0] c) [110] d) [111] X 2-A metal has an FCC structure with a lattice parameter of 0.362 nm and atomic weight of 63.54 g/mole. The metal density in g/cm³ is a) 8.98 b) 897.9 c) 0.11 d) 5846

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter21: The Solid State: Crystals

Section: Chapter Questions

Problem 21.47E

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Q1- Choose the correct answer for the following (Justify your answer): 1-The direction indices for the crystallographic direction indicated by the vector are a) [101] b) [1 1 0] c) [110] d) [111]
The crystal structure of magnesium oxide, CaS, is similar to rock salt (NaCl). a) What are the coordination numbers of Ca2+ and S2-. b) What is the type of unit cell that you would expect CaS to have? c) Given that the ionic radii is (Ca2+ = 100 pm and S2- = 184 pm) what is the length and volume of the unit cell.
Figure 2: A hexagonal close-packed layer of atoms in two dimensions. (a) (b) Figure 3: Conventional unit cells for: (a) the fcc structure; (b) the bcc structure. Answer ALL questions in Section B Question B1 SECTION B a) A hexagonal close-packed layer in two dimensions is shown in figure 2. By identifying a suitable unit cell, calculate the packing fraction of this structure. b) Two possible cubic crystal structures are shown in figure 3. Part (a) shows the fcc struc- ture, in which atoms are touching along a face-diagonal. Part (b) shows the bcc structure, in which atoms are touching along a body diagonal of the cube. Calculate the packing fractions of each of these structures. Which one of them is close- packed?
2. Consider the zinc blend (ZnS) crystal structure shown below, a) Show that the minimum cation-anion radius ratio is 0.225. b) Develop a general equation to relate the unit cell edge length (a) to the radius of Zn²+ and S²- and calculate the theoretical density of the crystal structure in g/cm³. (8 The ionic radii of Zn²+ and S² are 0.060 and 0.184 nm, respectively. 3. An alternating copolymer is n 250,000 g/mol and ethyla O sions of the HCP crystal structure, 0 2n S
value, 7.87 g/cm'. 4. Rhodium has an atomic radius of 0.1345 nm and density of 12.41 g/cm'. Determine whether it has an FCC or BCC crystal structure. The unit cell for tin has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318 nm, respectively. If the density, atomic weight, and atomic radius are 7.30 g/cm3, 118.69 g/mol, and 0.151 nm, respectively, compute the atomic packing factor. 5.
1. A cubic solid is made of two elements P and Q. Atoms of P are located at each corner and four (4) at the midpoints of the edges. Meanwhile, the two atoms of Q are in the body- centre. (a) What is the formula of the compound? Show your work. (b) What are the coordination numbers of P and Q? (c) Draw a structure of cubic above.
a) calculate the packing efficiency of a body-centred cubic structure. (show working) b) the density of Co, Ni and Cu are all 8.9 g cm^-3 while the density of Fe is 7.8) g cm^-3. Explain why the density of Co, Ni sand Cu are the same and the density of Fe is lower. c) KBr adopts the rock salt structure, which unit cell length a= 6.5944 Å. Calculate the density of KBr (show working)
Choose the corect answer : Determine the a1, a2, a3 in the crystal give us information about a) Primitive lattice orientation b) Primitive lattice structure c) Primitive lattice vectors d) Primitive lattice dimension
A crystal has a cubic unit cell of 4.2 Å. Using a wavelength of 1.54 Å at which 2θ value would you expect tomeasure the (111) peak?
1. Show that the atomic packing factor for HCP is 0.74
2. Body-Centered Ualt Cell (a) (b) Fig 5. Body-Centered Cubic (BOCC) Unir Cell. (a) Ball-and-Stick Model (b) Space-filled Model (c) (c) Stacking Find the volume of the entire unit cell including the empty space in terms of r. Remember for a cube the volume, V= /xw x h. You already know the edge length of the side in terms of "r" based in the earlier questions. Answer:
* .Refractories are of the . . ceramic types ........ advanced traditional ...Electrical conductivity of Ceramics is low because valence electrons are locked in bonds between atoms. they have a wide electron bands. they are electropositive. ons are rarely joined edge to edge, and never face to * .face, but always share the corners Because of the high charge on the Si+4 ion. Because of the low electronegativity of Si atom.

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