how to characterize the crystallline structure?
149062
The question is not clear.  Are you asking what a crystal is?  Are you asking what the different crystal structures are?  Are you asking for the characteristics of crystals in general?
304689
You can get a hollow prism, fill it with water or some liquid and find its refractive index using a spectrometer. I did that for my ISC exam.
825026
what you need to do, get a SI data book, and look up their natural state. not bonded with anything else, and possibly itself.\n\nPhophorus - white: molecular (P4). red: Chain. Black: Layer\nIodine - molecular (I2)\nMagnesium - hexagonal closest-packing\nNeon - cubic closest-packing\nArsenic -grey: 3d structure - Layer formation. yellow: molecular As4\nSulfur- molecular S8\nBoron - complicated structure.\nSelenium - grey: chain, Red: molecular: Se8\nGallium - Complicated\nCesium - body-centred cubic\nOxxygen - O2, O3 molecular
816759
1. it forms in nature\n2. it is a solid\n3. it has a definite chemical makeup\n4. it has a crystal structure
165799
You want us to calculate acitivites?\n\nYou need to determine the ionic strength and atomic radius in order to do that.
1018103
http://www.crystalxp.net/galerie/en.id.130.htm
609399
Streak, I would say, based on the following:\n\nPhysical properties commonly used are :\n\nCrystal structure and habit: A mineral may show good crystal habit or form, or it may be massive, granular or compact with only microscopically visible crystals. \nHardness: the physical hardness of a mineral is usually measured according to the Mohs scale of mineral hardness. \nLuster indicates the way a mineral's surface interacts with light and can range from dull to glassy (vitreous).\nStreak refers to the color of the powder a mineral leaves after rubbing it on an unglazed porcelain streak plate.\nCleavage describes the way a mineral may come apart or cleave in different ways. In thin section, cleavage is visible as thin parallel lines across a mineral.
503889
Glass:\namorph structure (not cristaline)\ncasant\nan melted mixture of Na2O, SiO2, K20\ntransparent\ninsipide\n\nSalt:\ncristaline structure - cubic system\nNaCl - natrium chloride\ntranslucid\nsalty taste
83406
Ionic compounds (like NaCl) for lattice structures.  These lattice structures make up the crystaline arrangement of the compound.\n\nThe lattice of NaCl looks like a cube,\nhttp://zimmer.csufresno.edu/~davidz/Chem3AF97/ChB/IonicBond.html\nhttp://departments.kings.edu/chemlab/chemlab_v2/nacl.html
398032
http://en.wikipedia.org/wiki/Crystal
53419
Answer 1:\n"Glasses" are amorphous solids, that is, they don't have a regular shape.\nEssentially the opposite of crystalline solids which have a defined shape.\nWhen you break a crystalline solid, it will give flat, well defined faces.\nCrystals melt or decompose at definite temps and the change from s to l\nis usually abrupt.  Glass (say window glass) will shatter into irregular\nfaces and curves.  There are many different kinds of glass and none really\nhave a melting point.  All pretty much have silicon dioxide as a principle\ningredient then something else added:  Here are some numbers...keep in mind\nthese are all SOFTENING  points and NOT melting points:\nsilica glass: 1580 Celsius   soda-lime glass: 695 C\nborosilicate glass: 820 C    aluminosilicate glass: 915 C\nleaded glass: 630 C\nWhat I'm trying to say is:  glass isn't a liquid.  It's a solid with so\nmany 'defects' that the order inherent in a crystal is absent.  When I\nsay defects, I'm talking at the molecular level, not physical scratches,\nand so on. You may want to recheck that 100 K number you presented.\nThat's 173 degrees Celsius below zero (-280 F)!\nAm I going to get some arguments about my stance?  I'll find out more\nfrom our resident glassblower here at the university.\n-Joe Schultz\n\nAnswer 2:\nI very much agree with J. Schultz's response...  Here are a couple\nof other observations:\nGlass is formed by melting silicon dioxide (SiO2) which has a\nmelting point of 1710 deg. C..  In its crystalline form, SiO2\nhas a very ordered structure with each Si atom bonded to 4 O atoms\nand each O atom attached to two Si atoms.  If the SiO2 is quickly\ncooled after being melted, the SiO2 "molecules" do not have a chance\nto get completely lined up in their solid crystalline form and thus\nan amorphous solid (glass) is formed.\nOften we like to categorize substances as gas, solid, or liquid..\nobviously, glass is somewhere between a solid and a liquid --\nsome scientists refer to it as a pseudo-solid\n-Dr. Brown
364902
Most crystals form three basic shapes: simple cubic, body-centered cubic, and face-centered cubic.  Simple cubic has molecules at each corner of a cube, body-centered cubic has molecules at each corner of a cube and one in the center, and face-centered cubic has molecules at each corner of a cube and one in the center of each face.
699607
This site is a good resource for chemical structures and their properties.\nhttp://www.chemicalland21.com/\n\nSpecifically for Sodium erythorbate:\nhttp://www.chemicalland21.com/lifescience/foco/SODIUM%20ERYTHORBATE.htm
174475
mix it...let NaCl dissolve in water...then let the mmixture evaporate or perhaps bring the mixture into a boil 'til you can see the formation of crystals...   try it... i've encountered such experiment in my chemistry class... im not quite certain of the procedures though...it's two years ago...cant remember it well...^_^
135532
You can either look it up or determine it experimentally.\nI cant get much more specific without additional details.
844758
Using the Michaelis-Menten equation.\n\nMore details on teh attached link\n\nhttp://www.le.ac.uk/by/teach/biochemweb/tutorials/michment2print.html\n\nGood luck
138630
It is a tetrahydrate of Iron III salicylate.  The structure can be found in the paper listed below: