Why is salt crystal a cube?
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
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?
336452
NaCl IS NOT TWO ATOMS (sodium and chlorine) BONDED TOGETHER!\n\nNaCl is what is known in chemistry as an ionic salt.  That means that a very positively charged Na+ ion met up with a very negatively charged Cl- ion, and because opposite charges attract, they got close to each other in what is known as an ionic bond, which isn't really a bond, just two particles hanging out together.
1066723
I'm quite sure it's A, extrusive rocks are exposed and cool very quickly.  Since they cool rapidly, crystals have no time to grow, and most crystals are smaller than a millimeter.  Obsidian, in fact, has no crystals at all and is a type of glass.  Intrusive rocks (such as granite) on the other hand, cool slowly (as they are insulated by the earth) and larger crystals form.  \n\nFor further information,\nhttp://www.geology.ufl.edu/Class_Notes/GLY2010_Fall_1996/summaries/intrus1.html\nhttp://www.nps.gov/brca/Geodetect/Rocks%20&%20Minerals/igneous.htm\n\nHope this is helpful.
1057120
If I remember right, the crystalline structure of the salt breaks down, and the Na and Cl ions move freely in the water, dissolving into the water.\nSince the salt breaks down into free ions, that explains why salt water is such a good electrical conductor.
346695
An alum solution with water makes a very nice crystal and is hydrated.  Check out this website with how to grow crystals: \n\nhttp://chemistry.about.com/cs/howtos/ht/alumcrystal.htm\n\nIn short, A hydrated crystal is a crystal that contains water as part of its chemical formula and structure. It may or may not absorb water vapor from the atmosphere. A crystal that is hygroscopic is one that absorbs water\nvapor from the atmosphere. CaCl2 and P2O5 are examples.
696797
One way is by growing a big, pure crystal of the material. Since all the molecules are the same, and the crystal is pure, then all the molecules must fit together a certain way to form the shape of the 'ideal' crystal. \n\nX-ray crystallography, which the previous answerer referred to, is when they shine a thin beam of x-rays through the crystal, to see how they are diffracted. This shows how the crystal is constructed inside.\n\nIn addition to this, if the molecules are large enough, an electron microscope can sometimes see the layers of molecules on the outside of a crystal, or the inner layers if it is split open. \n\nBy using techniques like this, scientist can build up a mental concept of what shape and size the basic units of the crystal must be, the molecules. Then they can make little stick-and-ball shapes that represent the molecules and build up large structures (representing very tiny crystals.) If their predictions are correct, the large shape they build up should resemble the actual crystals, with the same angles and the same shape planes, etc.\n\n19 NOV 06, 1756 hrs, GMT.
321854
Crystallization occurs when an ionic compound (think table salt) which is dissolved in solution (think water)and the solvent(water) is subsequently evacuated. Table salt, or sodium chloride forms a crystal structure (like the granules you find in a salt shaker) in its solid state. The definition of a crystalline structure is characterized by a repetitive lattice-like pattern between the molecules. This salt example is not the only way crystallization occurs, but it's a good start.
744354
There is more effective distribution of charges in keeping the atoms together because the alkaline tend to lose two electrons.  It is not a crystal but is more crystalline than alkali.
23033
If you were able to get the salt solution cold enough, it would freeze. However, if you put two ice trays side by side, one filled with water, the other filled with salt water, and chilled them to the point where both froze, the would both be the same temperature. However, once the cold was taken away, the salt solution would melt at a much lower temperature than the water only cubes.\n\nWhat salt does when added to water is decrease the temperature at which water will freeze -- as well as melt. How much the freezing/melting point is lowered depends on how much salt is added. The higher the concentration, the lower the freezing/melting point.
521017
The formula for table salt is NaCl (Sodium Chloride). It exists in face-centred crystal lattices.
378321
Sugar does because its bonds are non-ionic. Salt has ionic bonds and they are harder to break in order for it to dissolve.\n\nHOWEVER, there are many factors to be considered. fine salt may dissolve faster than a large piece of rock candy. The surface area to weight ratio of the solid plays a huge role in the rate.\n\nOh. And flour isn't very soluble in water.
703543
Mmmm... Salt....\n\nYou will get a super-saturated solution. Like the sugar they use to make rock candy, salt dissolves better in hot water. Saturated means it has as much solute (salt, in your question) in it as will possibly dissolve, so a saturated solution at 60 degrees celsius has quite a lot of salt in it!\n\nAs the saturated solution goes back to normal temperatures, it eventually reaches the point where there is MORE salt in solution than would normally dissolve. This is called a super-saturated solution. It still looks like it did before, except saltier than normally possible.\n\nSeveral things can happen to a super-saturated solution as it cools. Either it appears unchanged, or crystals start to grow like when you are making rock candy. You would see crystals around the edges and on the sides and bottom of the container. Some substances like sodium nitrate are so soluable that they can crystalize all at once when disturbed, which looks like the solution instantly froze solid. Table salt does not normally do this, so just write that it would go from saturated to super-saturated and crystals would form.
33251
Salt is a mineral, and probably is present everywhere in the world. I've heard that Native Americans traded salt among themselves long before we came here.
377409
Google it! I typed "x-ray crystallography NaCl" and this was the top hit.
106372
u know that ice is H20 right? but that's not enough. it would easily melt if that's pure ice. so there is a Salt there. NaCl. why? because water or an ice slowly melts when thre is a substance. and vice versa when the water boils with salt.
945741
Due to the fact that this salt is found as a hydrated salt (first Na2SO4.10H20 and then as Na2SO4.7H2O, so, with the increase of temperature it looses moisture (water)). When the Na2SO4.10H2O is heated the solution of this compound decreases because a solid phase and a liquid phase are formed after the initial heating.