Is glass really formed from sand by extreme heat? Explain.?
969632
Yes, Glass should be the cheapest product you should buy. It is made of Silicate which is sand. They heat the the sand up using special vessels to remove any impurities from the Silicate, then the glass is formed at a different temperature after removing all impurities from the sand.
520735
Sand is mostly silicon and can be made into glass.\n\nAbuses?  Well, I suppose you could kick sand in somebody's face.
780172
Teacher is wrong. This is a popular misconception, but the usually cited "proof", that old windows are thicker at the bottom, only proves that old glass was irregular in thickness. A smart glazier would install a pane thick edge down for better strength.\n\nEvidence to the contrary includes the fact that large telescope mirrors and lenses, which must be figured  to within less than 100 nanometers (4 micro-inches), maintain this figure indefinitely. Telescopes over 100 years old are still in use. Also, glass artifacts over 3000 years old still hold their shape.\n\nThis misconception arises because glass, being an amorphous, as opposed to crystalline solid, has no clearly defined melting point. However, at temperatures below the glass transition temperature, glass is most definitely solid. Actually, metals exhibit more "liquid" behavior than glass does, because they will creep under load, something glass does not do.
419637
cloud formation occurs when water vapor condenses on particles in the atmosphere which causes a release of latent heat so i would venture a guess that it an exothermic reaction.
674691
Actually, your assumption than glass is not elastic is dead wrong.  It is, in fact, one of the most elastic substances known to man.  This follows from the definition of elasticity: The ability to deform and return to the original shape.\n\nThis is commonly confused with PLASTICITY, the ability to deform and STAY deformed, which glass has virtually zero of.\n\nThat said, it should be noted that contrary to graemefirth's assertion, glass has no crystal stucture, but rather at room temperature is actually the world's most viscous LIQUID!  The proof of this can be measured in ancient church window panes which have sagged over hundreds of years to be thicker at the bottom than the top.\n\n----BELIEVE IT OR NOT------
338498
There are different types of glass, with different specific heat values.  Specific Heat is also called Heat Capacity.\n\nFlint Glass   0.503 Joules / gram Kelvin\nPyrex Glass   0.753 Joules / gram Kelvin
480536
should be glass. unless in its original form of sand than should be water. Remember Super-man made that huge piece of glass to reflect the sun an blind those crazy alien people!
70332
Many rocks are a composite mixture of two or more minerals, each with its own melting and freezing temperatures.  If the rock was molten at some time in the past, it may have slowly cooled allowing the minerals to grow into separate crystals with time.  The mineral with the highest melting temperature would be first to solidify during cooling followed by the next and lastly by the mineral with the lowest melting point.\n\nLet's imagine we could make an artificial "rock" using glass marbles (high melting temperature), sugar (intermediate melting temperature) and butter (lowest temperature).  As we slowly cooled the mix, the marbles that never melted would remain then the sugar would turn from taffy to rock candy and lastly the butter would fill in all the cracks and "glue" everything together.\n\nIf our rock remained cold it would remain hard.  But if we raised the temperature to near the melting point of butter, the entire rock would "melt" and fall apart when hot; even though the sugar might only turn back to taffy while the marbles remained relatively hard.  The results would depend of course on the minerals contained in a particular rock sample and perhaps how it formed.
680279
Technically a process can require the addition or extraction/removal of heat ENERGY.\n\nI cannot off the top of my head recognize a chem formula any longer, but adding oxygen to any system is oxidation and generates its own heat.  Tehcnically even iron rusting generates heat, just a very small amount, since any metal "rusting" is just it oxidizing.  \n\nAs far as the ice cubes, simply the removal of heat will not cause water molecule to become ice crystals,  I apologize, but I forget why.  I remember an experiment I saw and tried.  In a very clean container, pour distilled water. Now cover that container with another container that does not touch the first.  (Like putting a big bowl over a smaller bowl with the distilled water.  The water stays liquid all the way down to around -20 C.  But if you damage the stablility of the bowl by say gently tapping the side, the water will then turn to a solid.\n\nSnow in clouds form when the water molucle has a dust mote or other item to cling to and begin forming the ice crystal which eventually gets heavy enough to possibly fall all the way to the ground.
964473
Silica; it's what makes glass, and ceramics have insulative properties. Other than that, it would be petroleum products such as plastics, and vinyls. Rubber comes from a plant.
623497
Glass and SiO2 are chemically same. But the glass is sytematic arrangement of atomic structure and can happen as a slow physical process
1130160
The most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide), usually in the form of quartz which because of its chemical inertness and considerable hardness is quite resistant to weathering. However, the composition of sand varies according to local rock sources and conditions.
832073
Glass is made of sandstone.  Stone would be earth.
602445
Glass is made of sand. Sand has the chemical formula of SiO2 (silicon dioxide). Although it seems to "look" like a base and some may expect it to react with an acid, this appearance is not true.\n\nSilicon is a non-metal and silicon dioxide is a macromolecule with a giant structure like that of diamond (tetrahedral). I.e. one silicon atom is attached to 4 oxygen atoms and the total ratio of Si to O is 1:2 (thus the chemical formula).\n\nDue to this, the macromolecule doesn't react with acids and so it is safe to carry acids of very high concentrations.
1126335
the world needs more Glass.... all that sand, heat from a few nuclear explosions... viola, more glass for the rest of the world
28640
Common glass contains about 70% silica (amorphous silicon dioxide or SiO2), which is the same chemical compound found in quartz, or in its polycrystalline form, sand. The other two ingredients commonly used in glass are soda (sodium carbonate Na2CO3) and lime (calcium oxide (CaO). Silica must be heated to 2000 degrees Fahrenheitin order to be melted.\n\nIn order to make glass into a lens, lanthanum oxide is added to the mixture to give the lense a gives glass a high refractive index and low dispersion. Most lenses for glasses are not made of glass however, but rather of a plastic known as CR2 or of polycarbonate.
961174
When the suns rays heat up the air above a surface and the heated air is appearing to shimmer (different index of refraction) then that can appear as a mirage (for water for example). I think some mirages (along the highway) are pure imagination and others (water in the desert) are also partly wishful thinking.