8. Au adopts a fcc crystal structure with lattice constant a=4.08Å and AHsub=324.4 kJ/mol. Calculate y in mJ/m² for the following surfaces of gold: a. Au(100) b. Au(110) c. Au(111) d. Au(410)
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- 13. Show that the maximum packing ratio in the diamond structure is n/3/16. [Hint: The structure may be viewed as two interpenetrating fcc lattices, arranged such that each atom is surrounded by four other atoms, forming a regular tetrahedron.] 14. A quantitative theory of bonding in ionic crystals was developed by Born and Meyer along the following lines: The total potential energy of the system is taken to be ae? E = N-Consider a two-dimensional crystal with rectangular shape, dimensions 10 um x 1 um, lattice spacing 0.15 nm (assume square lattice). a. What is the Fermi level assuming one electron per atom? b. What is the density of states as a function of electron energy?Calculate the lattice energy of AgFis) using the following thermodynamic data (all data is in kj/mol). Note that the data given has been perturbed, so looking up the answer is probably not a good idea. Ag(s) AHsublimation 265 kJ/mol Ag(g) 1E-711 kl/mol F-F(9) D - 138 kJ/mol F(9) EA 348 kJ/mol Agf(s) AH-225 k/mol mol
- A. What is the empirical formula of the ionic compound? B. What is the coordination number of the anion?RA A. WHAT TYPE OF INTERMOLECULAR FORCE EXIST BETWEEN THE FF PAIR 1. HBr and H;S 2. Cl, and CBr. 3. hand NO, 4. NH, and C,Hs mr nme B. Gold Au crystallizes in a cube closed packed structure (face centered cube) and has a density of 19.3 g/cm³. Calculate the atomic radius of the gold. mmTrue or False 1. The highest polarizability and expected to have the highest boiling point is Cl2 among H2, N2, & O2 2. Considering (simple cubic, face-centered cubic, hexagonal closed packed) structures, the least efficient packing is the simple cubic. 3. In the electron sea model, the valence electrons in metals are assumed to be fixed in the lattice points.
- 15. What kind of bonding is present in rust, which is made of ferric oxide (Fe2O3)? a. ionic bondingb. covalent bondingc. metallic bondingd. cannot be determinede. hydrogen bondingWhich of the situations below is unlikely? a. When a strip of zinc is placed for some minutes in a solution of CuS04 the blue color fades away.b. A solution of ZnC12 stored in an aluminum container was found to be impurec. Copper pipes are less appropriate to use in laboratories than iron and lead pipes.d. A magnesium bar is attached to a buried iron pipe to protect the pipe from corrosion Most of the metals possess a face-centered crystal structure. Which of the following statements is not true about the structure? a. Each third layer sphere fits into a depression that is directly over a depression in the first layerb. It has a density lower than scc and bcc.c. It has a packing efficiency (74%) greater than scc and bcc.d. The atoms at the four corners of a face all "touch" the atom at the center of that face, but the atoms at the corners do not touch one another40. The elements Si and P are added to steel to improve its properties in electric motors, and some N is often found as a detrimental impurity. Which of these elements fills interstitial holes in the Fe lattice, and which substitutes for the Fe in the lattice?
- The precious metal platinum was first used by indigenous peoples of South America, who found impure, native samples of it in the Au mines of what is now Ecuador and used the samples to make small items of jewelry. Platinum’s high melting point (1772oC) makes it harder to work than Au (1064oC) and Ag (962oC), but this same property and a high resistance to chemical attack make Pt suitable as a material for high-temperature crucibles. Although Pt is a noble metal, in the +4 and +2 states it forms a variety of compounds, many of which are coordination complexes. Its coordinating abilities make it an important catalyst for organic and inorganic reactions. The anticancer cisplatin (mentioned during lectures) can be prepared from K2PtCl6 via reduction with hydrazine (N2H4), giving K2PtCl4, followed by replacement of the 2 Cl ion ligands with NH3. Give the names to the three platinum compounds referred to. Draw coordination complex trans-Platinum diammine dichloride and label the Pt with its…4. Dolomite CaMg(CO3), CaMg(CO3), Bà Ca +Mg* +2CO 2- has Ksp= 10:17.20 at 25°C, DH° = -28.48 kJ/mol. What is the Ksp for this reaction at 35°C? Use Van't Hoff equation log K₁ = log K₁ + 4, Hº A,H° 1 2.303 A(7-7) TThe precious metal platinum was first used by indigenous peoples of South America, who found impure, native samples of it in the Au mines of what is now Ecuador and used the samples to make small items of jewelry. Platinum’s high melting point (1772oC) makes it harder to work than Au (1064oC) and Ag (962oC), but this same property and a high resistance to chemical attack make Pt suitable as a material for high-temperature crucibles. Although Pt is a noble metal, in the +4 and +2 states it forms a variety of compounds, many of which are coordination complexes. Its coordinating abilities make it an important catalyst for organic and inorganic reactions. Draw coordination complex trans-Platinum diammine dichloride and label the Pt with its oxidation number. For Pt4+, draw energy level diagrams of the d-AOs and show orbital occupancy in both weak and strong octahedral fields. Calculate the total spin for each case. Calculate the CFSE (crystal field stabilization energy) in terms of Δ0 for…