4.1 Define the following terms:(a) Polymorphic substance.(b) Hexagonal closest packing.4.2 Consider the cubic diamond crystal:(a) Define lattice and basis for the cubic diamond crystal structure(b) Calculate the angle between the tetrahedral bonds of the carbon atoms in the diamondcrystal. (use the cube shown in the figure 4.1)(c) Calculate the value for the packing coefficient of the diamond structure.4.3 Derive an expression for the total cohesive energy UT at the equilibrium separation Ro. Assumethat the crystal contains N molecules

It is derived from Greek Word; Polymorphs. Where ''poly'' means many and ''morphe'' means shapes. A…

Answered: 4.1 Define the following terms: (a)…

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4.1 Define the following terms: (a) Polymorphic substance. (b) Hexagonal closest packing.

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 21.37E

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Concept explainers

Quantum Mechanical Treatment of the Valence Bond Theory

Quantum mechanical treatment of valence bond theory refers to the relationship established between the quantum mechanical theory and the valence bond theory to describe the chemical bonding in a particular molecule.

Question

4.1 Define the following terms:
(a) Polymorphic substance.
(b) Hexagonal closest packing.
4.2 Consider the cubic diamond crystal:
(a) Define lattice and basis for the cubic diamond crystal structure
(b) Calculate the angle between the tetrahedral bonds of the carbon atoms in the diamond
crystal. (use the cube shown in the figure 4.1)
(c) Calculate the value for the packing coefficient of the diamond structure.
4.3 Derive an expression for the total cohesive energy UT at the equilibrium separation Ro. Assume
that the crystal contains N molecules

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Step 3 Definition of Hexagonal closest packing

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Step 4 Total number of atoms in unit cell of HCP

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