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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.
A laser pulse of light with a frequency of 1.14 × 1020 Hz contains 2000 photons. Calculate the energy in J of the pulse.
A cylinder contains a mixture of hydrogen and chlorine molecules. Compare without doing any calculations
At 1.00 atm and 0 °C, a 5.04 L mixture of methane (CH4) and propane (C3H8) was burned, producing 18.0 g of CO2. What was the mole fraction of each gas in the mixture? Assume complete combustion.
What is the chemical definition of a buffer solution? Give an example. 2. The Ka of benzoic acid C7H5O2H, IS 6.5X10^-5. What is the buffer range?
Washing soda is often added to detergent formulations to make the wash water more basic. What is the formula of the NONHYDRATED form of washing soda? Does it increase or decreased the pH of the wash water?
During the combustion of 5.0 g of octane, C8H18, 239.5 kcal is released. How many grams and how many moles of octane must be burned to release 450 kcal?
A compound A(C6H6) undergoes catalytic hydrogenation over lindlar catalyst to give a compound B, which in turn undergoes ozonolysis followed by workup with aqueous H2O2 to yield succinic acid and two equivalents of formic acid.
if the the atmospheric pressure is 685 mm Hg, what would the partial pressure of oxygen and of nitrogen be?
What pressure is exerted by 0.625-mole of a gas in a 45.4-L container at -24.0°C?
A reaction with the activation energy Ea= 166.00 kJ/mol, has a rate constant k = 3.900 x 102 at 329.00 Kelvin. Determine the rate constant when the temperature is changed to 693.00 Kelvin. R = 8.314 J K-1mol-1
That depicts that two hydrogen atoms bond with one oxygen atom to make the compound we call water. If water comprises most of our body mass explain simply why there is a greater amount of oxygen by mass in our bodies than hydrogen.
complete the following chart of gas properties. For each positive observation, write a balanced chemical equation to describe the process.
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