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- Use the Born-Mayer equation to estimate the latticeenthalpy of calcium sulfide. CaS. The crystal adopts a rocksalt structure w ith the distance between the centres of nearest neighbours being 284 pm.The table below shows some physical properties of halogenatedliquids.Which of the following statements best explains these data?(a) The larger the dipole moment, the stronger the intermolecularforces, and therefore the boiling point is lowest for themolecule with the largest dipole moment. (b) The dispersionforces increase from F to Cl to Br; since the boiling point alsoincreases in this order, the dispersion forces must make a fargreater contribution to intermolecular interactions thandipole–dipole interactions. (c) The trend in electronegativityis F 7 Cl 7 Br; therefore, the most ionic compound 1CH2F22has the lowest boiling point, and the most covalent compound1CH2Br22 has the highest boiling point. (d) Boiling point increaseswith molecular weight for these nonpolar compounds.CSCI a -ions withct crystallizes into Pons a simple cubit unit cel of C!- he cubit interstaial sites similar to a BCC). a) Whatis the coordination number of Cst and Cl-? o ccUPying b) How many of eachion (Es and C1)ispresent per unit cell? CLiventhat the radius of Cstis 174 pm and the radius of Ciis 181 pmy what is the edge length of the cel? Answer pn picometers. d) calculation, watis the density of Caci? the density of Cscl? and the molar mass From previous The molar of CI is 35.45 glmol. (Hint: calaulation, Whatiss r mass of Cstis 132.9 glmol OF Avogadro's nomber=6.0221 mol") Convert Answer in g/cm. e) whyrs the radius of Cigreater than the rodius of (st? pens GEAR
- The table below shows some physical properties of halogenatedliquids. Which of the following statements best explains these data?(a) The larger the dipole moment, the stronger the intermolecularforces, and therefore the boiling point is lowest for themolecule with the largest dipole moment. (b) The dispersionforces increase from F to Cl to Br; since the boiling point alsoincreases in this order, the dispersion forces must make a fargreater contribution to intermolecular interactions thandipole-dipole interactions. (c) The trend in electronegativityis F > Cl > Br; therefore, the most ionic compound (CH2F2)has the lowest boiling point, and the most covalent compound(CH2Br2) has the highest boiling point. (d) Boiling point increaseswith molecular weight for these nonpolar compounds.Pleasseeeeee explainexplain the mass tranfer theory of crystal growth?
- The thermal and mechanical processing of materials isan important step in ensuring that they have the appropriatephysical properties for their intended application. Suppose ametallic element undergoes a phase transition in which itscrystal structure changes from cubic close-packed to bodycentred cubic. (a) Does it become more or less dense? (b) Bywhat factor does its density change?(D) LiCless > Lics) + 2 Uzca) (c) (5)!Y LiClcs sind ర U. %#335 Whch of the follawigaCarbon forms a number of allotropes, two of which are graphite and diamond. Silicon has a diamond structure. Why is there of allotrope of silicon with a graphite structure?
- As minerals were formed from the molten magma, different ions occupied the same cites in the crystals. Lithium often occurs along with magnesium in minerals despite the difference in the charge on their ions. Suggest an explanation.The normal boiling points of the fluorides of the secondperiod elements are as follows: LiF, 1676°C; BeF2, 1175°C; BF3, 2100°C; CF4, -128°C; NF3,-129°C; OF2,-145°C; F2, -188°C. Describe the nature of the intermolecularforces in this series of liquids, and account for the trendsin boiling point.Qil Caleulate the lattice .of the ionie crystals, Which have Onersy the Nacl structure, when X = l75 and n =9 : O CaO (ro = 0.24 nm) cAns. 3414 ks lmi) O Nach Cro = 0-281 um) (Ans, 788 bglmd) kcl Cro = o-314 um) CAs, 701 ks/nd] Naßr (ro>o-298 mm) CAnS. 732 k5/m) e Br Cro = 0:329 mm) CAng. .67) by lmo)