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An introduction similar to this related to the same subject with is the crystalline structures, if you can paraphrase it in a way that does not make it plagiarized then that's fine too 2 Crystalline structures based on packing of hard spheres 2.1 Introduction
The bonding energy between pairs of atoms is minimized at a xed equilibrium distance r0, because of this most solid materials spontaneously adopt a crystalline arrangement in which atoms or ions are positioned along an ordered periodic array called the crystalline lattice. All metals, and most covalent and ionic solids, form crystalline structures under normal solidi cation conditions. Many properties of crystalline solids depend on the crystal structure, being the manner in which atoms or ions are spatially arranged. When the atoms favor no particular bonding orientations, the crystalline structure can be conveniently described using the hard sphere model. As metallic bonding is nondirectional in nature, the structure of most elemental metals is accurately described by the dense packing of hard spheres. In this model, hard spheres representing nearest neighboring atoms touch one another and form a densely packed structure. In case of elemental metals, all the atoms are identical. Three relatively simple crystal structures are found for most metals: face-centered cubic (FCC), hexagonal close-packed (HCP) and body centered cubic (BCC). FCC and HCP correspond to very dense atomic arrangements called closed packed structure, while BCC is a less dense structure. Crystal structures determine most of the properties of a material. It can be witnessed in the beautiful natural formations of minerals, or in a more indirect way in industry. For example, turbine blades for ghter jets are grown such that only one crystal orientation is possible within the whole blade. Because of that speci c structure, the blade will not deform when exposed to extreme heat. This is only one of the many consequences of the study of crystallography.
3.2 x 10-3 moles of O2 gas effuse from a container in 10.0 minutes. How many moles of CH4 gas could effuse from the same container in 10.0 minutes under the same conditions
A first-order reaction has a rate constant of 0.33 y-1. How many years does it take for the concentration of the reactant to decrease from 0.13 M to 0.088 M?
Mt. Kilimanjaro in Tanzania is the tallest peak in Africa (19,340 ft.). On a particular day, the barometric pressure at the top of the mountain was 330 torr. On that day, at what Celsius temperature did water boil on the top of the mountain?
a mixture of methane and ethane is stored in a container at 294 mmHg. The gases are burned in air to form co2 and h2o. if the pressure of co2 is 357 mmhg measured at the same temperature and volume as the original mixture, calculate the mole fract..
Hospital X-ray generators emit X-rays with wavelength of about 15.0 nanometers (nm), where 1 nm= 10^-9 m. What is the energy of the X-rays
A catalyst decreases the activation energy of a particular exothermic reaction by 59 kJ/mol, to 51 kJ/mol. Assuming that the mechanism has only one step, and that the products are 94 kJ lower in energy than the reactants
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Why does EDTA^4- cease to function as chelating ligand if acid is added to the solution
Octane has a density of 0.692 g/mL at 20 degrees celsius How many grams of oxygen are required to burn 1.10 gal of octance.
For a reaction of the form, A + B + C Products, the following observations are made: doubling the concentration of A increases the rate by a factor of 4, doubling the concentration of B has no effect on the rate, and doubling the concentration of ..
methanol, CH3OH can be produced through the reaction of CO and H2. if 75.o grams of CO is used and the typical yield is 79.8%, what mass of methanol is likely to be produced.
A 1.07g sample of a noble gas occupies a volume of 363mL at 35C and 678mmHg. Indentifythe noble gas in this sample
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