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- Define an alloy and an amalgam State the main constituents of the following alloys Stainless steel, Bronze In which property, each of them is different from its main constituentHow will you distinguish between the following pairs of terms:(i) Tetrahedral and octahedral voids(ii) Crystal lattice and unit cellDetermine the crystal structure for the following: (a) a metal with a0 = 4.9489 Å, r = 1.75 Å and one atom per lattice point; and (b) a metal with a0 = 0.42906 nm, r = 0.1858 nm and one atom per lattice point.
- Define the term Interstitial alloys?6:23 @ X l 77% i (ii) Alloys have similar structures to pure metals. Give a labelled diagram that shows the structure of a typical alloy, such as brass.Sketch the band structure of a Li AND a Si crystal. (ii) How would you expect the electrical conductivity in Li AND Si crystals to vary with temperature? (iii) Account for the fact that the conductivity of Si is enhanced by the addition of small amounts of B.
- (a) Why does Li Cl acquire pink colour when heated in Li vapours? (b) A solid with cubic crystal is made of two elements ‘P’ and ‘Q’ Atoms of ‘Q’ are at the comers of the cube and ‘P’ at body centre. What is the formula of compound?How do atomic radius ratios relate to strength in alloys?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.
- Classify the following compounds as substitutional, interstitial, or intermetallic alloy: (i) PAB015 (ii) Ag Sn (iii) Cu. ssZno34 (iv) Ti,900.01 '0.15 (A) (i) – Substitutional alloy, (ii) – Intermetallic compound, (iii) – Intermetallic alloy, (iv) – Substitutional alloy (B) (i) – Substitutional alloy, (ii) – Intermetallic compound, (iii) – Intermetallic alloy, (iv) – Interstitial alloy (C) (i) – Intermetallic alloy, (ii) Interstitial - compound, (iii) Interstitial -alloy, (iv) Substitutional alloy (D) (i) – Interstitial alloy, (ii) - Intermetallic compound, (iii) – Substitutional alloy, (iv) – Interstitial alloyDetermine if each statement is true or false: (a) Substitutionalalloys are solid solutions, but interstitial alloys areheterogenous alloys. (b) Substitutional alloys have “solute”atoms that replace “solvent” atoms in a lattice, but interstitialalloys have “solute” atoms that are in between the “solvent”atoms in a lattice. (c) The atomic radii of the atomsin a substitutional alloy are similar to each other, but in aninterstitial alloy, the interstitial atoms are a lot smaller thanthe host lattice atoms.Q.7. Which of the following metal(s) would you expect to form a substitutional solid solution having complete selubility with Cr? Explain your answers Atomic radius (om) Electronegativity Metal Crystal structure FCC Valence Al 0.143 15 +3 Cr 0.125 SCC 1.6 +3 Fe 0.124 BCC 18 +2 0.160 HCP 1.3 +2 0.132 BCC 1.6 +3 Zn 0.133 HCP 16 +2