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11 Nov 2019
The equilibrium distance between Mg^2+ and O^2- ions in MgO is 0.21 nm. (a) What is the attractive force (in N) between this Mg^2+ ion and a neighboring O^-2 ion at this equilibrium distance? What is the repulsive force (in N) between this Mg^2+ ion and a neighboring O^2- ion at this equilibrium distance? (b) What are the comparable values for NaCI where the radii of Na^+1 and Cl^-1 are 0.098 nm and 0.181 nm, respectively? Use this equation to determine forces: E_Coulomb = -|Z_1||Z_2|e^2/4 pi epsilon_0 r Electrostatic Attraction + b/r^n Electronic Repulsion Very briefly explain the following trends in crystal energies (delta H_cryst): CaS > KCl: LiF > CsBr: MgO > MgS: MgO > BaO using the relationship: E_0 (or delta H_cryst) = N_A M|Z_i||Z_j|e^2/4 pi epsilon_0 times 1/r_0 (1 - 1/n) Assume, hard sphere model (see definition of r_o in Problem 5), similar M & n, and atomic numbers (Ar: 18: He: 2: Ne: 10: Xe: 54: Kr: 36: Ca: 20: S: 16: K: 19: Cl: 17: Li: 3: F: 9: Cs: 55: Br: 35: Mg: 12: O: 8: S16: Ba: 56).
The equilibrium distance between Mg^2+ and O^2- ions in MgO is 0.21 nm. (a) What is the attractive force (in N) between this Mg^2+ ion and a neighboring O^-2 ion at this equilibrium distance? What is the repulsive force (in N) between this Mg^2+ ion and a neighboring O^2- ion at this equilibrium distance? (b) What are the comparable values for NaCI where the radii of Na^+1 and Cl^-1 are 0.098 nm and 0.181 nm, respectively? Use this equation to determine forces: E_Coulomb = -|Z_1||Z_2|e^2/4 pi epsilon_0 r Electrostatic Attraction + b/r^n Electronic Repulsion Very briefly explain the following trends in crystal energies (delta H_cryst): CaS > KCl: LiF > CsBr: MgO > MgS: MgO > BaO using the relationship: E_0 (or delta H_cryst) = N_A M|Z_i||Z_j|e^2/4 pi epsilon_0 times 1/r_0 (1 - 1/n) Assume, hard sphere model (see definition of r_o in Problem 5), similar M & n, and atomic numbers (Ar: 18: He: 2: Ne: 10: Xe: 54: Kr: 36: Ca: 20: S: 16: K: 19: Cl: 17: Li: 3: F: 9: Cs: 55: Br: 35: Mg: 12: O: 8: S16: Ba: 56).
Nelly StrackeLv2
27 Jun 2019